Molecular basis of water use efficiency mediated by ABA receptors (B01)

水分亏缺是制约作物产量和影响产量稳定的主要因素。拟南芥中某些脱落酸受体的异位表达可导致植物蒸腾作用降低，而光合速率和生长特性不受影响。与野生型相比，通过降低细胞间二氧化碳水平，这些品系的二氧化碳吸收效率更高。植物如何在细胞间二氧化碳浓度降低的情况下维持光合作用是一个有趣且尚未解决的问题，可能涉及多个水平的代谢调节。本课题将对这一水分利用效率性状的生理和遗传基础进行研究。

Water deficit is the major limitation of crop yield and impinges on yield stability. Ectopic expression of certain abscisic acid receptors in Arabidopsis thaliana can result in plants having reduced transpiration while photosynthesis rate and growth properties are unaffected. CO2 uptake into these lines is more water-efficient by a lowered intercellular CO2 level compared to wild type. How plants can sustain photosynthesis with lowered intercellular CO2 concentrations is an intriguing and unresolved question and might involve metabolic adjustments at multiple levels. In this project part, the physiological and genetic basis of this water use efficient trait will be studied.