Effect of Plant Growth Promoting Bacteria on the Growth of Wheat Seedlings Subjected to Phosphate Starvation

A - Papers appearing in refereed journals

Cataldi, M. P., Heuer, S., Mauchline, T. H., Wilkinson, M. D., Masters-Clark, E., Di Benedetto, N. A., Corbo, M. R. and Flagella, Z. 2020. Effect of Plant Growth Promoting Bacteria on the Growth of Wheat Seedlings Subjected to Phosphate Starvation . Agronomy. 10 (7), p. 978. https://doi.org/10.3390/agronomy10070978

AuthorsCataldi, M. P., Heuer, S., Mauchline, T. H., Wilkinson, M. D., Masters-Clark, E., Di Benedetto, N. A., Corbo, M. R. and Flagella, Z.
Abstract

Certain phosphorous solubilizing (PSB) and phosphorous mineralizing (PMB) bacteria may improve plant growth by improving nutrient availability. The aim of this work was to evaluate the effect of inoculation with two Bacillus spp. strains, 12A and 25A, on wheat seedlings growth. To this aim, a durum and a bread wheat genotype were grown under controlled conditions in a low P compost medium to evaluate: (i) the effect of the bacterial isolates on plant growth and root system architecture; (ii) the expression of two key genes indicative of the P-starvation response and phosphate (Pi) uptake, TaIPS1 and TaPHT1.6-B1. The results showed that 12A Bacillus sp. significantly increased root length, surface area and biomass. Furthermore, an enhanced shoot dry weight and P content were observed. This might be explained by the capacity of strain 12A to produce indole-3-acetic acid (IAA) in addition to P mineralizing and P solubilizing capability. No effect on plant growth was observed for 25A strain. The semi-quantitative gene expression analysis showed an overall lower expression of TaIPS1 in the inoculated plants and highest expression of TaPHT1.6-B1 in 12A inoculated plants. This suggests that Pi-responsive genes might be useful molecular indicators for the effectiveness of PSB and PMB

KeywordsPGPB; Wheat; P-solubilizing bacteria; P-mineralizing bacteria; P-deficiency; IAA; Root architecture; TaIPS1; TaPHT1.6-B1
Year of Publication2020
JournalAgronomy
Journal citation10 (7), p. 978
Digital Object Identifier (DOI)https://doi.org/10.3390/agronomy10070978
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDesigning Future Wheat - WP1 - Increased efficiency and sustainability
S2N - Soil to Nutrition [ISPG]
ASSIST - Achieving Sustainable Agricultural Systems
Publisher's version
Output statusPublished
Publication dates
Online08 Jul 2020
Publication process dates
Accepted06 Jul 2020
PublisherMDPI
ISSN2073-4395

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