Understanding abiotic stress tolerance mechanisms in soybean: a comparative evaluation of soybean response to drought and flooding stress

Mutava, R., Prince, S., Syed, N., Song, L., Valliyodan, B., Chen, W. and Nguyen, H. (2015) Understanding abiotic stress tolerance mechanisms in soybean: a comparative evaluation of soybean response to drought and flooding stress. Plant physiology and biochemistry : PPB / Société française de physiologie végétale, 86. pp. 109-20. ISSN 1873-2690.

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Many sources of drought and flooding tolerance have been identified in soybean, however underlying molecular and physiological mechanisms are poorly understood. Therefore, it is important to illuminate different plant responses to these abiotic stresses and understand the mechanisms that confer tolerance. Towards this goal we used four contrasting soybean (Glycine max) genotypes (PI 567690 - drought tolerant, Pana - drought susceptible, PI 408105A - flooding tolerant, S99-2281 - flooding susceptible) grown under greenhouse conditions and compared genotypic responses to drought and flooding at the physiological, biochemical, and cellular level. We also quantified these variations and tried to infer their role in drought and flooding tolerance in soybean. Our results revealed that different mechanisms contribute to reduction in net photosynthesis under drought and flooding stress. Under drought stress, ABA and stomatal conductance are responsible for reduced photosynthetic rate; while under flooding stress, accumulation of starch granules played a major role. Drought tolerant genotypes PI 567690 and PI 408105A had higher plastoglobule numbers than the susceptible Pana and S99-2281. Drought stress increased the number and size of plastoglobules in most of the genotypes pointing to a possible role in stress tolerance. Interestingly, there were seven fibrillin proteins localized within the plastoglobules that were up-regulated in the drought and flooding tolerant genotypes PI 567690 and PI 408105A, respectively, but down-regulated in the drought susceptible genotype Pana. These results suggest a potential role of Fibrillin proteins, FBN1a, 1b and 7a in soybean response to drought and flooding stress.

Item Type: Article
Subjects: Q Science > QD Chemistry > QD0241 Organic chemistry > QD0415 Biochemistry
Q Science > QK Botany
Q Science > QK Botany > QK0900 Plant ecology
Divisions: Faculty of Social and Applied Sciences > School of Human and Life Sciences
Depositing User: Naeem Syed
Date Deposited: 19 Feb 2015 14:50
Last Modified: 19 Feb 2015 14:58
URI: https://create.canterbury.ac.uk/id/eprint/13062

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Last edited: 29/06/2016 12:23:00