Regulation of photosynthesis and water-use efficiency in pima and upland cotton species subjected to drought and recovery.

ABSTRACT: Photosynthesis is extremely sensitive to drought and decreases due to co-occurring stomatal, mesophyll, and biochemical limitations. Few studies have shown the effects of a drought cycle (drought-rewatering) on photosynthesis and water-use efficiency (WUE) in cotton. Here, the dynamics of photosynthesis in upland (Gossypium hirsutum) and pima (G. barbadense) cotton were analyzed during a drought cycle. While both species decreased net CO₂ assimilation rate (P _N) to a similar extent under drought, in pima cotton rewatering rapidly restored P _N, the stomatal conductance (g _s), the maximum carboxylation rate (V _cmax), and the maximum electron transport rate above the control level. Meanwhile, the

SUBMITTER: Han JM 

PROVIDER: S-EPMC11609770 | biostudies-literature | 2024

REPOSITORIES: biostudies-literature