Ian Clark

NameIan Clark
Job titleSenior Scientific Specialist - Soil Microbiology
Email addressian.clark@rothamsted.ac.uk
DepartmentSustainable Agriculture Sciences Harpenden
Research clusterSAS-H: Soil Biology
ORCIDhttps://orcid.org/0000-0002-1589-5420
Preferred citationClark, I. M.
OfficeHarpenden

Research outputs

Soil as an Extended Composite Phenotype of the Microbial Metagenome

Neal, A. L., Bacq-Labreuil, A., Zhang, X., Clark, I. M., Coleman, K., Mooney, S. J., Ritz, K. and Crawford, J. W. 2020. Soil as an Extended Composite Phenotype of the Microbial Metagenome. Scientific Reports. 10, p. 10649.

Development of a compost system for the study of plant-microbe interactions

Masters-Clark, E., Hirsch, P. R., Clark, I. M., Paradelo, M. and Mauchline, T. H. 2020. Development of a compost system for the study of plant-microbe interactions . Scientific Reports. 10, p. 7521.

Wheat dwarfing influences selection of the rhizosphere microbiome

Kavamura, V. N., Robinson, R. J., Hughes, D., Clark, I. M., Rossmann, M., De Melo, I.S., Hirsch, P. R., Mendes, R. and Mauchline, T. H. 2020. Wheat dwarfing influences selection of the rhizosphere microbiome. Scientific Reports. 10, p. 1452.

Effects of urease and nitrification inhibitors on soil N, nitrifier abundance and activity in a sandy loam soil

Fu, Q., Abadie, M., Blaud, A., Carswell, A. M., Misselbrook, T. H., Clark, I. M. and Hirsch, P. R. 2019. Effects of urease and nitrification inhibitors on soil N, nitrifier abundance and activity in a sandy loam soil . Biology And Fertility Of Soils. pp. 1-10.

Land management and microbial seed load effect on rhizosphere and endosphere bacterial community assembly in wheat

Kavamura, V. N., Robinson, R. J., Hayat, R., Clark, I. M., Hughes, D. J., Rossmann, M., Hirsch, P. R., Mendes, R. and Mauchline, T. H. 2019. Land management and microbial seed load effect on rhizosphere and endosphere bacterial community assembly in wheat. Frontiers in Microbiology. 10 (2625).

Plant–microbe networks in soil are weakened by century‐long use of inorganic fertilizers

Huang, R., McGrath, S. P., Hirsch, P. R., Clark, I. M., Storkey, J., Wu, L., Zhou, J. and Liang, Y. 2019. Plant–microbe networks in soil are weakened by century‐long use of inorganic fertilizers. Microbial Biotechnology. 12 (6), pp. 1464-1475.

The pH optimum of soil exoenzymes adapt to long term changes in soil pH

Puissant, J., Briony, J., Goodall, T., Mang, D., Blaud, A., Gweon, H. S., Malik, A., Jones, D. L., Clark, I. M., Hirsch, P. R. and Griffiths, R. 2019. The pH optimum of soil exoenzymes adapt to long term changes in soil pH. Soil Biology and Biochemistry. 138, p. 107601.

Land use driven change in soil pH affects microbial carbon cycling processes

Malik, A.A., Puissant, J., Buckeridge, K.M., Goodall, T., Jehmlich, N., Chowdhury, S., Gweon, H.S., Peyton, J.M, Masson, K.E., van Agtmaal, M., Blaud, A., Clark, I. M., Whitaker, J., Pywell, R.F., Ostle, N., Gleixner, G. and Griffiths, R.I. 2018. Land use driven change in soil pH affects microbial carbon cycling processes. Nature Communications. 9 (3591).

Inorganic Nitrogen Application Affects Both Taxonomical and Predicted Functional Structure of Wheat Rhizosphere Bacterial Communities

Nessner-Kavamura-Noguchi, V., Hayat, R., Clark, I. M., Rossmann, M., Mendes, R., Hirsch, P. R. and Mauchline, T. H. 2018. Inorganic Nitrogen Application Affects Both Taxonomical and Predicted Functional Structure of Wheat Rhizosphere Bacterial Communities. Frontiers in Microbiology. 9, p. 1074.

Rothamsted Long-term experiments : guide to the classical and other long-term experiments, datasets and sample archive

Macdonald, A. J., Poulton, P. R., Clark, I. M., Scott, T., Glendining, M. J., Perryman, S. A. M., Storkey, J., Bell, J. R., Shield, I. F., Mcmillan, V. E. and Hawkins, J. M. B. Macdonald, A. J. (ed.) 2018. Rothamsted Long-term experiments : guide to the classical and other long-term experiments, datasets and sample archive. Rothamsted Research, Harpenden.

Spatial zoning of microbial functions and plant-soil nitrogen dynamics across a riparian area in an extensively grazed livestock system

De Sosa, L. L., Glanville, C. C., Marshall, M. R., Williams, A. P., Abadie, M., Clark, I. M., Blaud, A. and Jones, D. L. 2018. Spatial zoning of microbial functions and plant-soil nitrogen dynamics across a riparian area in an extensively grazed livestock system. Soil Biology and Biochemistry. 120, pp. 153-164.

Old meets new: most probable number validation of metagenomic and metatranscriptomic datasets in soil

Mauchline, T. H., Hayat, R., Clark, I. M. and Hirsch, P. R. 2018. Old meets new: most probable number validation of metagenomic and metatranscriptomic datasets in soil. Letters in Applied Microbiology. 66 (1), pp. 14-18.

The short-term effects of nitrification inhibitors on the abundance and expression of ammonia and nitrite oxidizers in a long-term field experiment comparing land management

Fu, Q., Clark, I. M., Zhu, J., Hu, H. Q. and Hirsch, P. R. 2018. The short-term effects of nitrification inhibitors on the abundance and expression of ammonia and nitrite oxidizers in a long-term field experiment comparing land management. Biology And Fertility Of Soils. 54 (1), pp. 163-172.

Effect of microbial activity on penetrometer resistance and elastic modulus of soil at different temperatures

Gao, W., Muñoz-Romero, V., Ren, T., Ashton, R. W., Morin, M., Clark, I. M., Powlson, D. S. and Whalley, W. R. 2017. Effect of microbial activity on penetrometer resistance and elastic modulus of soil at different temperatures. European Journal of Soil Science. 68 (4), pp. 412-419.

Phylogenetic distribution, biogeography and the effects of land management upon bacterial non-specific Acid phosphatase Gene diversity and abundance

Neal, A. L., Blackwell, M. S. A., Akkari, E., Clark, I. M., Hirsch, P. R. and Guyomar, C. 2018. Phylogenetic distribution, biogeography and the effects of land management upon bacterial non-specific Acid phosphatase Gene diversity and abundance. Plant and Soil. 427, pp. 175-189.

Land-use influences phosphatase gene microdiversity in soils

Neal, A. L., Rossmann, M., Brearley, C., Akkari, E., Guyomar, C., Clark, I. M., Allen, E. and Hirsch, P. R. 2017. Land-use influences phosphatase gene microdiversity in soils. Environmental Microbiology. 19 (7), p. 2740–2753.

Soil resilience and recovery: rapid community responses to management changes

Hirsch, P. R., Jhurreea, D., Williams, J. K., Murray, P. J., Scott, T., Misselbrook, T. H., Goulding, K. W. T. and Clark, I. M. 2017. Soil resilience and recovery: rapid community responses to management changes. Plant and Soil. 412 (1-2), pp. 283-297.

Novel European free-living, nondiazotrophic Bradyrhizobium isolates from contrasting soils that lack nodulation and nitrogen fixation genes – a genome comparison

Jones, F. P., Clark, I. M., King, R., Woodward, M. J. and Hirsch, P. R. 2016. Novel European free-living, nondiazotrophic Bradyrhizobium isolates from contrasting soils that lack nodulation and nitrogen fixation genes – a genome comparison. Scientific Reports. 6 (25858), p. 10p.

Novel European free-living, non-diazotrophic Bradyrhizobium isolates from contrasting soils that lack nodulation and nitrogen fixation genes - a genome comparison

Jones, F. P., Clark, I. M., King, R., Shaw, L. J., Woodward, M. J. and Hirsch, P. R. 2016. Novel European free-living, non-diazotrophic Bradyrhizobium isolates from contrasting soils that lack nodulation and nitrogen fixation genes - a genome comparison. Scientific Reports. 6, p. 25858.

Wheat seed embryo excision enables the creation of axenic seedlings and Koch's postulates testing of putative bacterial endophytes

Robinson, R. J., Fraaije, B. A., Clark, I. M., Jackson, R. W., Hirsch, P. R. and Mauchline, T. H. 2016. Wheat seed embryo excision enables the creation of axenic seedlings and Koch's postulates testing of putative bacterial endophytes. Scientific Reports. 6, p. 25581.

Long-Term Impact of Field Applications of Sewage Sludge on Soil Antibiotic Resistome

Xie, W-Y., McGrath, S. P., Su, J. Q., Hirsch, P. R., Clark, I. M., Shen, Q., Zhu, Y-G. and Zhao, F-J. 2016. Long-Term Impact of Field Applications of Sewage Sludge on Soil Antibiotic Resistome. Environmental Science & Technology. 50 (23), pp. 12602-12611.

Responses of microbial community from tropical pristine coastal soil to crude oil contamination

Morais, D., Pylro, V., Clark, I. M., Hirsch, P. R. and Totola, M. R. 2016. Responses of microbial community from tropical pristine coastal soil to crude oil contamination. PeerJ. 4.

Endophytic bacterial community composition in wheat (Triticum aestivum) is determined by plant tissue type, developmental stage and soil nutrient availability

Robinson, R. J., Fraaije, B. A., Clark, I. M., Jackson, R. W., Hirsch, P. R. and Mauchline, T. H. 2016. Endophytic bacterial community composition in wheat (Triticum aestivum) is determined by plant tissue type, developmental stage and soil nutrient availability. Plant and Soil. 405 (1-2), pp. 381-396.

Pseudomonas spp. diversity is negatively associated with suppression of the wheat take-all pathogen

Mehrabi, Z., Mcmillan, V. E., Clark, I. M., Canning, G., Hammond-Kosack, K. E., Preston, G., Hirsch, P. R. and Mauchline, T. H. 2016. Pseudomonas spp. diversity is negatively associated with suppression of the wheat take-all pathogen. Scientific Reports. 6.

The unique contribution of Rothamsted to ecological research at large temporal scales

Storkey, J., Macdonald, A. J., Bell, J. R., Clark, I. M., Gregory, A. S., Hawkins, N. J., Hirsch, P. R., Todman, L. C. and Whitmore, A. P. 2016. The unique contribution of Rothamsted to ecological research at large temporal scales. in: Dumbrell, A. J., Kordas, R. L. and Woodward, G. (ed.) Advances in Ecological Research 55: Large-Scale Ecology: Model Systems to Global Perspectives Academic Press, Oxford. pp. 3-42

Over 150 years of long-term fertilization alters spatial scaling of microbial biodiversity

Liang, Y., Wu, Liyou, Clark, I. M., Xue, K., Yang, Y., Van Nostrand, J. D., Deng, Y., He, Z., McGrath, S. P., Storkey, J., Hirsch, P. R., Sun, B. and Zhou, J. 2015. Over 150 years of long-term fertilization alters spatial scaling of microbial biodiversity. mBio. 6, pp. e00240-15.

Metatranscriptomic census of active protists in soils

Geisen, S., Tveit, A. T., Clark, I. M., Richter, A., Svenning, M. M., Bonkowski, M. and Urich, T. 2015. Metatranscriptomic census of active protists in soils. The ISME Journal. 9, pp. 2178-2190.

Soil pH determines microbial diversity and composition in the Park Grass Experiment

Zhalnina, K., Dias, R., De Quadros, P. D., Davis-Richardson, A., Camargo, F. A. O., Clark, I. M., McGrath, S. P., Hirsch, P. R. and Triplett, E. W. 2015. Soil pH determines microbial diversity and composition in the Park Grass Experiment. Microbial Ecology. 69, pp. 395-406.

An analysis of Pseudomonas genomic diversity in take-all infected wheat fields reveals the lasting impact of wheat cultivars on the soil microbiota

Mauchline, T. H., Chedom-Fotso, D., Chandra, G., Samuels, T., Greenaway, N., Backhaus, A., Mcmillan, V. E., Canning, G., Powers, S. J., Hammond-Kosack, K. E., Hirsch, P. R., Clark, I. M., Mehrabi, Z., Roworth, J., Burnell, J. and Malone, J. G. 2015. An analysis of Pseudomonas genomic diversity in take-all infected wheat fields reveals the lasting impact of wheat cultivars on the soil microbiota. Environmental Microbiology. 17 (11), pp. 4764-4778.

The Rothamsted Long-term Experiments

Macdonald, A. J., Powlson, D. S., Poulton, P. R., Watts, C. W., Clark, I. M., Storkey, J., Hawkins, N. J., Glendining, M. J., Goulding, K. W. T. and McGrath, S. P. 2015. The Rothamsted Long-term Experiments. Valuing long-term sites and experiments for agriculture and ecology. Aspects of Applied Biology 128 . Association of Applied Biologists (AAB). pp. 1-10

Data analysis for 16S microbial profiling from different benchtop sequencing platforms

Pylro, V. S., Roesch, L. F. W., Morais, D. K., Clark, I. M., Hirsch, P. R. and Totola, M. R. 2014. Data analysis for 16S microbial profiling from different benchtop sequencing platforms. Journal of Microbiological Methods. 107 (December), pp. 30-37.

Attraction and preference of bacteriophagous and plant-parasitic nematodes towards different types of soil bacteria

Tahseen, Q. and Clark, I. M. 2014. Attraction and preference of bacteriophagous and plant-parasitic nematodes towards different types of soil bacteria. Journal Of Natural History. 48, pp. 1485-1502.

The impact of tissue type, growth stage and fertilizers on the community structure of cultured bacterial wheat endophytes in the Broadbalk experiment

Robinson, R. R., Fraaije, B. A., Clark, I. M., Jackson, R. W., Hirsch, P. R. and Mauchline, T. H. 2014. The impact of tissue type, growth stage and fertilizers on the community structure of cultured bacterial wheat endophytes in the Broadbalk experiment. American Phytopathological Society (APS).

Ca. Nitrososphaera and Bradyrhizobium are inversely correlated and related to agricultural practices in long-term field experiments

Zhalnina, K., De Quadros, P. D., Gano, K. A., Davis-Richardson, A., Fagen, J. R., Brown, C. T., Giongo, A., Drew, J. C., Sayavedra-Soto, L. A., Arp, D. J., Camargo, F. A. O., Daroub, S. H., Clark, I. M., McGrath, S. P., Hirsch, P. R. and Triplett, E. W. 2013. Ca. Nitrososphaera and Bradyrhizobium are inversely correlated and related to agricultural practices in long-term field experiments. Frontiers in Microbiology. 4, p. 104.

Potential mineralization and nitrification in volcanic grassland soils in Chile

Cardenas, L. M., Hatch, D. J., Scholefield, D., Jhurreea, D., Clark, I. M., Hirsch, P. R., Salazar, F., Rao-Ravella, S. and Alfaro, M. 2013. Potential mineralization and nitrification in volcanic grassland soils in Chile. Soil Science and Plant Nutrition. 59, pp. 380-391.

Culture-independent molecular approaches to microbial ecology in soil and rhizosphere

Hirsch, P. R., Mauchline, T. H. and Clark, I. M. 2013. Culture-independent molecular approaches to microbial ecology in soil and rhizosphere. in: Debruijn, F. J. (ed.) Molecular microbial ecology of the rhizosphere, Volume 1 John Wiley & Sons Hoboken, N.J.. pp. 45-55

Impacts of nitrogen application rates on the activity and diversity of denitrifying bacteria in the Broadbalk Wheat Experiment

Clark, I. M., Buchkina, N., Jhurreea, D., Goulding, K. W. T. and Hirsch, P. R. 2012. Impacts of nitrogen application rates on the activity and diversity of denitrifying bacteria in the Broadbalk Wheat Experiment. Philosophical Transactions of the Royal Society B-Biological Sciences. 367, pp. 1235-1244.

Structure, fluctuation and magnitude of a natural grassland soil metagenome

Delmont, T. O., Prestat, E., Keegan, K. P., Faubladier, M., Robe, P., Clark, I. M., Pelletier, E., Hirsch, P. R., Meyer, F., Gilbert, J. A., Le Paslier, D., Simonet, P. and Vogel, T. M. 2012. Structure, fluctuation and magnitude of a natural grassland soil metagenome. The ISME Journal. 6, pp. 1677-1687.

Metagenomic comparison of direct and indirect soil DNA extraction approaches

Delmont, T. O., Robe, P., Clark, I. M., Simonet, P. and Vogel, T. M. 2011. Metagenomic comparison of direct and indirect soil DNA extraction approaches. Journal of Microbiological Methods. 86 (3), pp. 397-400.

Accessing the soil metagenome for studies of microbial diversity

Delmont, T. O., Robe, P., Cecillon, S., Clark, I. M., Constancias, F., Simonet, P., Hirsch, P. R. and Vogel, T. M. 2011. Accessing the soil metagenome for studies of microbial diversity. Applied and Environmental Microbiology. 77 (4), pp. 1315-1324.

Exploring competitiveness and genetic variation in the nematophagous fungus Pochonia chlamydosporia var. chlamydosporia and its significance for biological control

Manzanilla-Lopez, R. H., Clark, I. M., Atkins, S. D., Hirsch, P. R. and Kerry, B. R. 2011. Exploring competitiveness and genetic variation in the nematophagous fungus Pochonia chlamydosporia var. chlamydosporia and its significance for biological control.

Transcriptome analysis shows differential gene expression in the saprotrophic to parasitic transition of Pochonia chlamydosporia

Rosso, L. C., Finetti-Sialer, M. M., Hirsch, P. R., Ciancio, A., Kerry, B. R. and Clark, I. M. 2011. Transcriptome analysis shows differential gene expression in the saprotrophic to parasitic transition of Pochonia chlamydosporia. Applied Microbiology and Biotechnology. 90, pp. 1981-1994.

Development of a real-time PCR assay for detection and quantification of Rhizobium leguminosarum bacteria and discrimination between different biovars in zinc-contaminated soil

Macdonald, C. A., Clark, I. M., Hirsch, P. R., Zhao, F-J. and McGrath, S. P. 2011. Development of a real-time PCR assay for detection and quantification of Rhizobium leguminosarum bacteria and discrimination between different biovars in zinc-contaminated soil. Applied and Environmental Microbiology. 77, pp. 4626-4633.

Impacts of land use change on denitrifying bacteria and nitrous oxide emissions

Hirsch, P. R., Jhurreea, D., Scott, T., Misselbrook, T. H., Goulding, K. W. T. and Clark, I. M. 2011. Impacts of land use change on denitrifying bacteria and nitrous oxide emissions. Abstracts Theo Murphy Scientific Meeting: Nitrous Oxide, the Forgotten Greenhouse Gas, Chicheley, 23-24 May 2011 .

Long-term impacts of zinc and copper enriched sewage sludge additions on bacterial, archaeal and fungal communities in arable and grassland soils

Macdonald, C. A., Clark, I. M., Zhao, F-J., Hirsch, P. R., Singh, B. K. and McGrath, S. P. 2011. Long-term impacts of zinc and copper enriched sewage sludge additions on bacterial, archaeal and fungal communities in arable and grassland soils. Soil Biology and Biochemistry. 43, pp. 932-941.

Culture-independent molecular techniques for soil microbial ecology

Hirsch, P. R., Mauchline, T. H. and Clark, I. M. 2010. Culture-independent molecular techniques for soil microbial ecology. Soil Biology and Biochemistry. 42 (6), pp. 878-887.

Soil without plants: the consequences for microorganisms and mesofauna

Goulding, K. W. T., Murray, P. J., Sohi, S. P., Gilliam, L. M., Williams, J. K., Clark, I. M. and Hirsch, P. R. 2010. Soil without plants: the consequences for microorganisms and mesofauna. Gilkes, R. and Prakongkep, N. (ed.) Proceedings 19th World Congress of Soil Science, Brisbane, 1-6 August 2010 . Australian Society of Soil Science, Warragul. pp. 1622-1625

Effects of long-term fertilization and liming on microbial functions and diversity in the grassland site at Rothamsted Research, UK

Wu, Liyou, Liang, Y., Clark, I. M., Wue, K., Deng, Y., He, Z., Van Nostrand, J., Macdonald, C., Hirsch, P. R., McGrath, S. P. and Zhou, J. 2010. Effects of long-term fertilization and liming on microbial functions and diversity in the grassland site at Rothamsted Research, UK. Abstracts 13th International Symposium on Microbial Ecology, Seattle, 22-27 August 2010 .

Relative impact of soil, metal source and metal concentration on bacterial community structure and community tolerance

Macdonald, C. A., Yang, X., Clark, I. M., Zhao, F-J., Hirsch, P. R. and McGrath, S. P. 2010. Relative impact of soil, metal source and metal concentration on bacterial community structure and community tolerance. Soil Biology and Biochemistry. 42, pp. 1408-1417.

Targeting the active bacterial communities in soil pores

Mccabe, D., Clark, I. M., Sohi, S., Shaw, E. and Hirsch, P. R. 2010. Targeting the active bacterial communities in soil pores. Abstracts 13th International Symposium on Microbial Ecology, Seattle, 22-27 August 2010 .

Effects of long-term fertilization on spatial distribution patterns of microbial functional genes from the Rothamsted Experimental site

Liang, Y., Wu, Liyou, Clark, I. M., Xue, K., Deng, Y., He, Z., Hirsch, P. R., McGrath, S. P. and Zhou, J. 2010. Effects of long-term fertilization on spatial distribution patterns of microbial functional genes from the Rothamsted Experimental site. Abstracts 13th International Symposium on Microbial Ecology, Seattle, 22-27 August 2010 .

Long-term agricultural experiments reveal N influence on ammonia oxidizers and the predominance of CA. nitrososphaera

Giongo, A., Gano,K., Roesch, L., Casella, G., Daroub, S., Ramiez, K., Sayavedra-Soto, L., Arp, D., Clark, I. M., Hirsch, P. R., McGrath, S. P. and Triplett, E. 2010. Long-term agricultural experiments reveal N influence on ammonia oxidizers and the predominance of CA. nitrososphaera. Abstracts 13th International Symposium on Microbial Ecology, Seattle, 22-27 August 2010 .

Soil metagenomics: can we access the diversity?

Delmont, T., Cecillon, S., Clark, I. M., Simonet, P., Hirsch, P. R. and Vogel, T. 2010. Soil metagenomics: can we access the diversity? Abstracts 13th International Symposium on Microbial Ecology, Seattle, 22-27 August 2010 .

Role of antecedent soil moisture on microbial populations involved in gaseous N2O emissions - use of isotopomers to understand sources

Cardenas, L. M., Bol, R., Bergstermann, A., Meijide, A., Hirsch, P. R., Jhurreea, D., Clark, I. M., Gilliam, L., Goulding, K. W. T., Well, R. and Scholefield, D. 2010. Role of antecedent soil moisture on microbial populations involved in gaseous N2O emissions - use of isotopomers to understand sources. Abstracts Stable Isotope Mass-Spectrometry User Group (SIMSUG) Meeting, Exeter, 28-30 April 2010 .

Are long-term changes in soil organic matter reflected in the soil communities?

Murray, P. J., Hirsch, P. R., Gilliam, L. M., Sohi, S. P., Williams, J. K., Clark, I. M. and Brookes, P. C. 2009. Are long-term changes in soil organic matter reflected in the soil communities?

Are long-term changes in soil organic matter reflected in the soil communities?

Brookes, P. C., Hirsch, P. R., Gilliam, L. M., Clark, I. M., Sohi, S. P., Williams, J. K. and Murray, P. J. 2009. Are long-term changes in soil organic matter reflected in the soil communities? Abstracts 2009 International Annual Meetings of ASA-CSSA-SSSA: Footprints in the Landscape: Sustainability through Plant and Soil Sciences, Pittsburgh, 1-5 November 2009 .

Are long-term changes in soil organic matter reflected in the soil communities?

Murray, P. J., Hirsch, P. R., Gilliam, L. M., Sohi, S. P., Williams, J. K., Clark, I. M. and Brookes, P. C. 2009. Are long-term changes in soil organic matter reflected in the soil communities? Abstracts Forming Bridges in a Changing World: Society of Nematologists and Soil Ecology Society Conference, Burlington, 12-15 July 2009 .

Through the keyhole: a key to open the bacterial lock; aka using BrdU to target pore space diversity

Mccabe, D., Clark, I. M., Sohi, S. P., Shaw, L. and Hirsch, P. R. 2009. Through the keyhole: a key to open the bacterial lock; aka using BrdU to target pore space diversity. Abstracts Micro Soil: Integrating Biological, Physical and Chemical Techniques for the Study of Soil Micro-Habitats, Dundee, 16-17 September 2009 . pp. 24-25

Microbial diversity maintained in soils starved of plant inputs for 50 years

Clark, I. M., Gilliam, L. M., Sohi, S. P., Williams, J., Murray, P. J. and Hirsch, P. R. 2009. Microbial diversity maintained in soils starved of plant inputs for 50 years. Abstracts BAGECO 10: Bacterial Genetics and Ecology - Coexisting on a Changing Planet, Uppsala, 15-19 June 2009 . pp. 119

What plants do for soil and what happens after they've gone

Hirsch, P. R. and Clark, I. M. 2009. What plants do for soil and what happens after they've gone. Abstracts Plant Soil Interactions: Joint Meeting of the Scottish Root Group and the Scottish Discussion Group of the British Society of Soil Science, Aberdeen, 3 November 2009 .

Sequencing the microbial metagenome of an iconic grassland soil, the Rothamsted Park Grass Experiment

Hirsch, P. R. and Clark, I. M. 2009. Sequencing the microbial metagenome of an iconic grassland soil, the Rothamsted Park Grass Experiment. Abstracts BAGECO 10: Bacterial Genetics and Ecology - Coexisting on a Changing Planet, Uppsala, 15-19 June 2009 . pp. 73

Starving the soil of plant inputs for 50 years reduces abundance but not diversity of soil bacterial communities

Hirsch, P. R., Gilliam, L. M., Sohi, S. P., Williams, J. K., Clark, I. M. and Murray, P. J. 2009. Starving the soil of plant inputs for 50 years reduces abundance but not diversity of soil bacterial communities. Soil Biology and Biochemistry. 41 (9), pp. 2021-2024.

Use of real-time quantitative PCR to investigate root and gall colonisation by co-inoculated isolates of the nematophagous fungus Pochonia chlamydosporia

Atkins, S. D., Peteira, B., Clark, I. M., Kerry, B. R. and Hirsch, P. R. 2009. Use of real-time quantitative PCR to investigate root and gall colonisation by co-inoculated isolates of the nematophagous fungus Pochonia chlamydosporia. Annals of Applied Biology - AAB. 155, pp. 143-152.

Measuring abundance, diversity and parasitic ability in two populations of the nematophagous fungus Pochonia chlamydosporia var. chlamydosporia

Manzanilla-Lopez, R. H., Atkins, S. D., Clark, I. M., Kerry, B. R. and Hirsch, P. R. 2009. Measuring abundance, diversity and parasitic ability in two populations of the nematophagous fungus Pochonia chlamydosporia var. chlamydosporia. Biocontrol Science and Technology. 19, pp. 391-406.

Exploring competitiveness and genetic variation in the nematophagous fungus Pochonia chlamydosporia var. chlamydosporia and its significance for biological control

Manzanilla-Lopez, R. H., Clark, I. M., Atkins, S., Hirsch, P. R. and Kerry, B. R. 2009. Exploring competitiveness and genetic variation in the nematophagous fungus Pochonia chlamydosporia var. chlamydosporia and its significance for biological control. Abstracts IOBC 5th Meeting on Multitrophic Interactions in Soil, Uppsala, 11-13 June 2009 . pp. 27

Rapid and reliable DNA extraction and PCR fingerprinting methods to discriminate multiple biotypes of the nematophagous fungus Pochonia chlamydosporia isolated from plant rhizospheres

Manzanilla-Lopez, R. H., Clark, I. M., Atkins, S. D., Hirsch, P. R. and Kerry, B. R. 2009. Rapid and reliable DNA extraction and PCR fingerprinting methods to discriminate multiple biotypes of the nematophagous fungus Pochonia chlamydosporia isolated from plant rhizospheres. Letters in Applied Microbiology. 48 (1), pp. 71-76.

Long-term impacts of metal-rich sludge additions on soil microbial communities - effects of metal source and soil type

Macdonald, C., Yang, X., Clark, I. M., Hirsch, P. R. and McGrath, S. P. 2008. Long-term impacts of metal-rich sludge additions on soil microbial communities - effects of metal source and soil type. Abstracts 12th International Symposium on Microbial Ecology (ISME12): Microbial Diversity - Sustaining the Blue Planet, Cairns, 17-22 August 2008 .

Interactions on roots and the efficacy of Pochonia chlamydosporia as a biological control agent

Kerry, B. R., Clark, I. M., Esteves, I., Finetti, M., Hirsch, P. R., Gomez-Gil, L., Manzanilla-Lopez, R. H. and Rosso, L. C. 2008. Interactions on roots and the efficacy of Pochonia chlamydosporia as a biological control agent. Abstracts 6th Seminario Cientifico Internacional de Sanidad Vegetal, Habana, 22-26 September 2008 .

Survival of bacterial DNA and culturable bacteria in archived soils from the Rothamsted Broadbalk experiment

Clark, I. M. 2008. Survival of bacterial DNA and culturable bacteria in archived soils from the Rothamsted Broadbalk experiment. Abstracts BSSS Autumn Meeting on Something Old, Something New: Integrating Molecular Biology with Other Techniques in Soil Science, Harpenden, 17 September 2008 .

A novel method for sampling bacteria on plant root and soil surfaces at the microhabitat scale

Dennis, P. G., Miller, A. J., Clark, I. M., Taylor, R. G., Valsami-Jones, E. and Hirsch, P. R. 2008. A novel method for sampling bacteria on plant root and soil surfaces at the microhabitat scale. Journal of Microbiological Methods. 75, pp. 12-18.

Gene expression profiles in Pochonia chlamydosporia in conditions of saprotrophic-to-parasite transition

Finetti-Sialer, M., Hirsch, P. R., Kerry, B. R. and Clark, I. M. 2008. Gene expression profiles in Pochonia chlamydosporia in conditions of saprotrophic-to-parasite transition. Abstracts 5th International Congress of Nematology, Brisbane, 13-18 July 2008 .

Survival of bacterial DNA and culturable bacteria in archived soils from the Rothamsted Broadbalk experiment

Clark, I. M. and Hirsch, P. R. 2008. Survival of bacterial DNA and culturable bacteria in archived soils from the Rothamsted Broadbalk experiment. Soil Biology and Biochemistry. 40, pp. 1090-1102.

Controls on soil nitrogen cycling and microbial community composition across land use and incubation temperature

Cookson, W. R., Osman, M., Marschner, P., Abaye, D. A., Clark, I. M., Murphy, D. V., Stockdale, E. A. and Watson, C. A. 2007. Controls on soil nitrogen cycling and microbial community composition across land use and incubation temperature. Soil Biology and Biochemistry. 39, pp. 744-756.

Distribution of environmental mycobacteria in Karonga District, Northern Malawi

Chilima, B. Z., Clark, I. M., Floyd, S., Fine, P. E. M. and Hirsch, P. R. 2006. Distribution of environmental mycobacteria in Karonga District, Northern Malawi. Applied and Environmental Microbiology. 72 (4), pp. 2343-2350.

DNA fingerprinting methodology to monitor infectivity, competition and rhizosphere competence of Pochonia chlamydosporia isolates within bulk soil, rhizoshere and Meloidogyne incognita egg masses

Manzanilla-Lopez, R. H., Clark, I. M., Atkins, S., Hirsch, P. R. and Kerry, B. R. 2006. DNA fingerprinting methodology to monitor infectivity, competition and rhizosphere competence of Pochonia chlamydosporia isolates within bulk soil, rhizoshere and Meloidogyne incognita egg masses. Abstracts AAB Conference on Advances in Nematology, London, 12 December 2006 .

Assessing genetic diversity of Pochonia chlamydosporia populations using ERIC primers

Manzanilla-Lopez, R. H., Clark, I. M., Hirsch, P. R. and Kerry, B. R. 2006. Assessing genetic diversity of Pochonia chlamydosporia populations using ERIC primers. Abstracts 38th ONTA Annual Meeting, San Jose, 26-30 June 2006 .

Monitoring active bacterial communities in soil

Clark, I. M., Cookson, W. R., Hampshire, D. and Hirsch, P. R. 2006. Monitoring active bacterial communities in soil. Abstracts 158th Meeting of the Society for General Microbiology, Warwick, 3-6 April 2006 . pp. 52

The influence of season, agricultural management and soil properties on gross nitrogen transformations and bacterial community structure

Cookson, W. R., Marschner, P., Clark, I. M., Milton, N., Smirk, M. N., Murphy, D. V., Osman, M., Stockdale, E. A. and Hirsch, P. R. 2006. The influence of season, agricultural management and soil properties on gross nitrogen transformations and bacterial community structure. Australian journal of soil research. 44, pp. 453-465.

Impact of the nematophagous fungus Pochonia chlamydosporia on nematode and microbial populations

Tahseen, Q., Clark, I. M., Atkins, S. D., Hirsch, P. R. and Kerry, B. R. 2005. Impact of the nematophagous fungus Pochonia chlamydosporia on nematode and microbial populations. Communications in Agricultural and Applied Biological Sciences. 70(1), pp. 81-86.

The use of real-time PCR and species-specific primers for the identification and monitoring of Paecilomyces lilacinus

Atkins, S. D., Clark, I. M., Pande, S., Hirsch, P. R. and Kerry, B. R. 2005. The use of real-time PCR and species-specific primers for the identification and monitoring of Paecilomyces lilacinus. FEMS Microbiology Ecology. 51 (2), pp. 257-264.

Impact of genetically modified bacterial inoculants on the soil microbial community

Hirsch, P. R. and Clark, I. M. 2004. Impact of genetically modified bacterial inoculants on the soil microbial community. GM Crops - Ecological Dimensions. Aspects of Applied Biology 74 . pp. 141-153

Fungal molecular diagnostics of nematophagous fungi

Atkins, S. D., Clark, I. M., Morton, C. O. and Kerry, B. R. 2004. Fungal molecular diagnostics of nematophagous fungi.

Investigation of three nematophagous fungi in two potato cyst nematode suppressive soils

Atkins, S. D., Sosnowska, D., Evans, V. J., Clark, I. M., Hirsch, P. R. and Kerry, B. R. 2004. Investigation of three nematophagous fungi in two potato cyst nematode suppressive soils.

Co-induction of glutathione-S-transferases and multidrug resistance associated protein by xenobiotics in wheat

Theodoulou, F. L., Clark, I. M., He, X-L., Pallett, K. E., Cole, D. J. and Hallahan, D. L. 2003. Co-induction of glutathione-S-transferases and multidrug resistance associated protein by xenobiotics in wheat. Pest Management Science. 59 (2), pp. 202-214.

Detection and quantification of Plectosphaerella cucumerina , a potential biological control agent of potato cyst nematodes, using real-time PCR

Atkins, S. D., Clark, I. M., Sosnowska, D., Hirsch, P. R. and Kerry, B. R. 2003. Detection and quantification of Plectosphaerella cucumerina , a potential biological control agent of potato cyst nematodes, using real-time PCR. Abstracts 11th International Congress on Molecular Plant Microbe Interactions, St Petersburg, 18-27 July 2003 .

Vorticella sp. infestations in nematodes: a report

Tahseen, Q., Clark, I. M. and Kerry, B. R. 2003. Vorticella sp. infestations in nematodes: a report. Nematologia mediterranea. 31, pp. 195-196.

Detection and quantification of Plectosphaerella cucumerina , a potential biological control agent of potato cyst nematodes, by using conventional PCR, real-time PCR, selective media, and baiting

Atkins, S. D., Clark, I. M., Sosnowska, D., Hirsch, P. R. and Kerry, B. R. 2003. Detection and quantification of Plectosphaerella cucumerina , a potential biological control agent of potato cyst nematodes, by using conventional PCR, real-time PCR, selective media, and baiting. Applied and Environmental Microbiology. 69, pp. 4788-4793.

Approaches for monitoring the release of Pochonia chlamydosporia var. catenulata , a biocontrol agent of root-knot nematodes

Atkins, S. D., Hidalgo-Diaz, L., Clark, I. M., Morton, C. O., Montes De Oca, N., Gray, P. A. and Kerry, B. R. 2003. Approaches for monitoring the release of Pochonia chlamydosporia var. catenulata , a biocontrol agent of root-knot nematodes. Mycological Research. 107, pp. 206-212.

Initial testing of potential fungal biological control agents for potato cyst nematodes

Atkins, S. D., Clark, I. M., Sosnowska, D. and Kerry, B. R. 2002. Initial testing of potential fungal biological control agents for potato cyst nematodes. Proceedings Brighton Crop Protection Conference - Pests and Diseases, 2002 . pp. 79-84

Impact of GM bacterial inoculants on the soil microbial community

Hirsch, P. R. and Clark, I. M. 2002. Impact of GM bacterial inoculants on the soil microbial community. Abstracts International Conference on GMOs - Ecological Dimensions, Reading, 9-11 September 2002 .

Genetic and functional diversity in the rhizosphere of oilseed rape, wheat and potatoes

Gilliam, L. M., Clark, I. M. and Hirsch, P. R. 2002. Genetic and functional diversity in the rhizosphere of oilseed rape, wheat and potatoes. Abstracts BAGECO-7: 7th Symposium on Bacterial Genetics and Ecology, Bergen, 15-19 June 2002 . pp. 86

The influence of the symbiotic plasmid pRL1J1 on the distribution of GM rhizobia in soil and crop rhizospheres, and implications for gene flow

Clark, I. M., Mendum, T. A. and Hirsch, P. R. 2002. The influence of the symbiotic plasmid pRL1J1 on the distribution of GM rhizobia in soil and crop rhizospheres, and implications for gene flow. Antonie van Leeuwenhoek. 81, pp. 607-616.

The role of the rhizobium symbiotic plasmid in survival in the soil and the rhizosphere

Clark, I. M. and Hirsch, P. R. 2002. The role of the rhizobium symbiotic plasmid in survival in the soil and the rhizosphere. Abstracts BAGECO-7: 7th Symposium on Bacterial Genetics and Ecology, Bergen, 15-19 June 2002 .

The fate of genetically modified rhizobial inoculants in the field

Hirsch, P. R. and Clark, I. M. 2002. The fate of genetically modified rhizobial inoculants in the field. Abstracts 8th New Phytologist Symposium, Helsinki, 10-14 June 2002 .

Characterization of two novel Rhizobium leguminosarum bacteriophages from a field release site of genetically-modified rhizobia

Mendum, T. A., Clark, I. M. and Hirsch, P. R. 2001. Characterization of two novel Rhizobium leguminosarum bacteriophages from a field release site of genetically-modified rhizobia. Antonie van Leeuwenhoek. 79, pp. 189-197.

The development of Verticillium chlamydosporium as a biological control agent of root-knot nematodes in organic vegetable production in Havana

Hidalgo, L., Bourne, J. M., Rodriguez, M. G., Sanchez, L., Hernandez, M. A., Atkins, S. D., Clark, I. M. and Kerry, B. R. 2001. The development of Verticillium chlamydosporium as a biological control agent of root-knot nematodes in organic vegetable production in Havana. Abstracts 4th International Scientific Seminar of Plant Health/33rd Annual Meeting of the Organization of Nematologists of Tropical America (ONTA), Varadera, Cuba, 11-15 June 2001 . pp. 12

Inference of symbiotic plasmid involvement in the population dynamics of two GM rhizobia under different agricultural practices

Clark, I. M., Mendum, T. A. and Hirsch, P. R. 2000. Inference of symbiotic plasmid involvement in the population dynamics of two GM rhizobia under different agricultural practices. Abstracts 2nd Symposium of the EU Concerted Action on Mobile Genetic Elements' Contribution to Bacterial Adaptability and Diversity (MECBAD), Prague, 17-19 September 2000 . pp. 27-28

Role of ABC transporters in herbicide metabolism

Theodoulou, F. L., Clark, I. M., Mitchell, V. J., Moss, S. R. and Pallett, K. E. 1999. Role of ABC transporters in herbicide metabolism. Abstracts Society for Experimental Biology Plant Transport Group Meeting, Southampton, 8-10 September 1999 .

Nucleotide sequence of Cla 30 (Accession No. Y17386), a xenobiotic- inducible member of the GST superfamily from Triticum aestivum L. (PGR99-049)

Theodoulou, F. L., Clark, I. M., Pallett, K. E. and Hallahan, D. L. 1999. Nucleotide sequence of Cla 30 (Accession No. Y17386), a xenobiotic- inducible member of the GST superfamily from Triticum aestivum L. (PGR99-049).

Interactions between rhizobia and bacteriophages isolated from soil

Mendum, T. A., Clark, I. M. and Hirsch, P. R. 1999. Interactions between rhizobia and bacteriophages isolated from soil. Abstracts BAGECO-6: 6th Symposium on Bacterial Genetics and Ecology, Florence, 20-24 June 1999 . pp. 17

The genetic implications of bacteriophages in Rhizobium leguminosarum

Mendum, T. A., Clark, I. M. and Hirsch, P. R. 1999. The genetic implications of bacteriophages in Rhizobium leguminosarum. Abstracts 1st Symposium of the EU-concerted Action on Mobile Elements Contribution to Bacterial Adaptability (MECBAD), Le Mont Ste Odile, 23-27 April 1999 . pp. 23

A herbicide safener-induced MRP homologue from wheat

Theodoulou, F. L., Clark, I. M., Pallett, K. E. and Hallahan, D. L. 1998. A herbicide safener-induced MRP homologue from wheat. Abstracts 11th International Workshop on Plant Membrane Biology, Cambridge, 9-14 August 1998 . pp. 77

Molecular enzymology of plant cytochromes P450

Maughan, J. A., Nugent, J. H. A., Clark, I. M., Westlake, A. C. G. and Hallahan, D. L. 1997. Molecular enzymology of plant cytochromes P450. Proceedings Brighton Crop Protection Conference - Weeds, 1997 . pp. 597-604

Spatially distinct expression of two new cytochrome P450s in leaves of Nepeta racemosa : identification of a trichome-specific isoform

Clark, I. M., Forde, B. G. and Hallahan, D. L. 1997. Spatially distinct expression of two new cytochrome P450s in leaves of Nepeta racemosa : identification of a trichome-specific isoform. Plant Molecular Biology. 33, pp. 875-885.

N. racemosa mRNA for cytochrome P450, CYP71A6, partial

Clark, I. M. and Hallahan, D. L. 1996. N. racemosa mRNA for cytochrome P450, CYP71A6, partial.

Nepeta racemosa mRNA for cytochrome P450, CYP71A5

Clark, I. M. and Hallahan, D. L. 1996. Nepeta racemosa mRNA for cytochrome P450, CYP71A5.

Molecular analysis of cytochrome P450 cDNAs from Nepeta racemosa

Clark, I. M., Crank, S. F., Forde, B. G. and Hallahan, D. L. 1995. Molecular analysis of cytochrome P450 cDNAs from Nepeta racemosa. Abstracts 3rd International Symposium on Cytochrome P450 Biodiversity, Woods Hole, 8-12 October 1995 .

Plant cytochrome P-450 and agricultural biotechnology

Hallahan, D. L., Cheriton, A. K., Hyde, R., Clark, I. M. and Forde, B. G. 1993. Plant cytochrome P-450 and agricultural biotechnology. Biochemical Society Transactions. 21 (4), pp. 1068-1073.