A sulphur deficiency-induced gene, sdi1 , involved in the utilization of stored sulphate pools under sulphur-limiting conditions has potential as a diagnostic indicator of sulphur nutritional status

A - Papers appearing in refereed journals

Howarth, J. R., Parmar, S., Barraclough, P. B. and Hawkesford, M. J. 2009. A sulphur deficiency-induced gene, sdi1 , involved in the utilization of stored sulphate pools under sulphur-limiting conditions has potential as a diagnostic indicator of sulphur nutritional status. Plant Biotechnology Journal. 7 (2), pp. 200-209.

AuthorsHowarth, J. R., Parmar, S., Barraclough, P. B. and Hawkesford, M. J.
Abstract

A sulphate deficiency-induced gene, sdi1, has been identified by cDNA-amplified fragment length polymorphism (AFLP) analysis utilizing field-grown, nutrient-deficient wheat (Triticum aestivum var. Hereward). The expression of sdi1 was specifically induced in leaf and root tissues in response to sulphate deficiency, but was not induced by nitrogen, phosphorus, potassium or magnesium deficiency. Expression was also shown to increase in plant tissues as the external sulphate concentration in hydroponically grown plants was reduced from 1.0 to 0.0 mm. On this basis, sdi1 gene expression has potential as a sensitive indicator of sulphur nutritional status in wheat. Genome-walking techniques were used to clone the 2.7-kb region upstream of sdi1 from genomic DNA, revealing several cis-element motifs previously identified as being associated with sulphur responses in plants. The Arabidopsis thaliana gene most highly homologous to sdi1 is At5g48850, which was also demonstrated to be induced by sulphur deficiency, an observation confirmed by the analysis of microarray data available in the public domain. The expression of Atsdi1 was induced more rapidly than previously characterized sulphur-responsive genes in the period immediately following the transfer of plants to sulphur-deficient medium. Atsdi1 T-DNA 'knockout' mutants were shown to maintain higher tissue sulphate concentrations than wild-type plants under sulphur-limiting conditions, indicating a role in the utilization of stored sulphate under sulphur-deficient conditions. The structural features of the sdi1 gene and its application in the genetic determination of the sulphur nutritional status of wheat crops are discussed.

KeywordsBiotechnology & Applied Microbiology; Plant Sciences
Year of Publication2009
JournalPlant Biotechnology Journal
Journal citation7 (2), pp. 200-209
Digital Object Identifier (DOI)doi:10.1111/j.1467-7652.2008.00391.x
PubMed ID19154231
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
DEFRA - Department for Environment, Food and Rural Affairs UK
Funder project or codeCentre for Crop Genetic Improvement (CGI)
ISSN14677644
PublisherWiley
Grant IDAR0911
BB/C514066/1

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