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

IF 2.1 4区生物学 Q2 PLANT SCIENCES

Photosynthetica Pub Date : 2023-10-19 DOI:10.32615/ps.2023.036

J.M. HAN, J. FLEXAS, D.L. XIONG, J. GALMÉS, Y.L. ZHANG

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引用次数: 0

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 response of leaf intrinsic WUE (WUE_i) to drought and recovery was different between the two cotton species, which was mainly co-regulated by V_cmax and g_s. In conclusion, pima and upland cotton exhibit different response patterns of P_N and WUE_i during the whole process of drought and recovery.

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旱地棉和旱地棉光合作用和水分利用效率的调控

光合作用对干旱极其敏感，由于气孔、叶肉和生化限制的共同发生而减少。干旱循环(干旱复水)对棉花光合作用和水分利用效率的影响研究较少。以旱地棉(Gossypium hirsutum)和皮马棉(G. barbadense)为研究对象，分析了旱地棉和皮马棉在干旱周期中的光合作用动态。干旱条件下，两种棉花的净CO2同化率(PN)均有相似程度的下降，但复水后，棉花的PN、气孔导度(gs)、最大羧化率(Vcmax)和最大电子传递率均迅速恢复到对照水平以上。同时，两种棉花叶片内在水分利用效率(WUEi)对干旱和恢复的响应存在差异，主要受Vcmax和gs的共同调控。综上所述，在干旱和恢复的整个过程中，皮麻和陆地棉的PN和WUEi表现出不同的响应模式。

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来源期刊

Photosynthetica 生物-植物科学

CiteScore

5.60

自引率

7.40%

发文量

审稿时长

3.8 months

期刊介绍： Photosynthetica publishes original scientific papers and brief communications, reviews on specialized topics, book reviews and announcements and reports covering wide range of photosynthesis research or research including photosynthetic parameters of both experimental and theoretical nature and dealing with physiology, biophysics, biochemistry, molecular biology on one side and leaf optics, stress physiology and ecology of photosynthesis on the other side. The language of journal is English (British or American). Papers should not be published or under consideration for publication elsewhere.