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Impact of heat stress during seed development on soybean seed metabolome
- Chebrolu, Kranthi K., Fritschi, Felix B., Ye, Songqing, Krishnan, Hari B., Smith, James R., Gillman, Jason D.
- Metabolomics 2016 v.12 no.2 pp. 28
- Glycine max, antioxidants, climate change, genotype, genotype-environment interaction, germination, heat stress, heat tolerance, metabolites, metabolome, metabolomics, pathogens, seed development, seeds, soybeans, summer, temperature, tissues, United States
- Seed development is a temperature-sensitive process that is much more vulnerable than vegetative tissues to abiotic stresses. Climate change is expected to increase the incidence and severity of summer heatwaves, and the impact of heat stress on seed development is expected to become more widespread during the course of the 21st century. A recent change to soybean cultivation practices in the Midsouthern region of the United States is also associated with higher temperatures during seed development, which frequently results in seed with poor germination, increased incidence of pathogen infection, and decreased economic value. Global metabolite profiles were contrasted between seed from heat-tolerant and heat-susceptible genotypes produced under control and two elevated temperature conditions. Seed of a heat-tolerant line were able to germinate with much high efficiency, and in general were less impacted by elevated temperatures as compared to a commonly grown high yielding, but heat-sensitive genotype. A total of 275 seed metabolites were analyzed by three metabolite profiling methods, and genotype-specific differences and temperature specific differences were identified. A diverse set of antioxidant metabolites were found to be enriched in seed of the heat tolerant genotype; these compounds are likely responsible, at least in part, for the physiology of heat tolerance.