Phenotypic plasticity conditions the response of soybean seed yield to elevated atmospheric CO2 concentration

摘要: Selection for cultivars with superior responsiveness to elevated atmospheric CO2 concentrations (eCO2) is a powerful option boosting crop productivity under future eCO2. However, neither criteria eCO2 nor prescreening methods have been established. The purpose of this study was identify traits responsible soybean (Glycine max). We grew 12 Japanese and U.S. that differed in their maturity group determinacy ambient 2 years temperature gradient chambers. elevation significantly increased seed yield per plant, the magnitude varied widely among (from 0% 62%). increase best explained by aboveground biomass pod number plant. These results suggest plasticity production from enhancement, would therefore be key factor response eCO2, resource-rich environment. To test hypothesis, we same at low planting density, environment improved light nutrient supplies minimizing competition. Low density ranged 5% 105% owing due low-density positively correlated both years. confirm our hypothesis high reveals suitable parameters breeding maximize