Author:
Cui Bingjing,Liu Jie,Zhang Manyi,Wan Heng,Wei Guiyu,Wei Zhenhua,Liu Fulai
Abstract
AbstractUnderstanding the impact of future climates on crop performance is essential for sustainable agricultural production. In the current research, the development and biological behavior of soybean plants during gradual desiccation of the soil (from the 100% of pot water holding capacity to the gs of plant decreased to 10% of that of the control plants) at ambient [CO2] (a[CO2], 400 ppm) and elevated [CO2] (e[CO2], 800 ppm) were investigated. The results showed that plants grown under e[CO2] conditions had remarkably higher photosynthetic rate (An) but lower stomatal conductance (gs) and transpiration rate (E) compared to plants at a[CO2] conditions, which led to an enhanced water use efficiency at both stomatal (WUEi) and leaf levels (WUEleaf). In addition, the e[CO2]-grown soybeans showed a stunted gs response to progressive soil drying, coinciding with a decrease in the susceptibility of gs to the ABA signaling, though they tended to maintain a better leaf water status under drought than the a[CO2]-grown plants. Although the leaf nitrogen concentration (Nleaf) and the total plant N content were notably lower at the e[CO2] condition, the specific leaf N content (SLN) was similar at different [CO2] conditions. Compared to soybean grown under e[CO2], the greater number of nodules at e[CO2] treatment would lead to an enhanced N-fixation, yet, it did not improve the N nutrition of the plants. Nevertheless, by sustaining the SLN, the soybean plants enhanced An when growing at e[CO2], particularly under dry conditions. This knowledge is essential for sustaining soybean production in future climate change scenarios.
Funder
National Natural Science Foundation of China
Royal Library, Copenhagen University Library
Publisher
Springer Science and Business Media LLC
Subject
Plant Science,Agronomy and Crop Science,Physiology