数字农科院2.0

Phosphorus Availability Affects the Photosynthesis and Antioxidant System of Contrasting Low-P-Tolerant Cotton Genotypes

文献类型： 外文期刊

作者： Mirezhatijiang Kayoumu;Asif Iqbal;Noor Muhammad;Xiaotong Li;Leilei Li;Xiangru Wang;Huiping Gui;Qian Qi;Sijia Ruan;Ruishi Guo;Xiling Zhang;Meizhen Song;Qiang Dong

作者机构：

关键词： antioxidant enzymes;chlorophyll fluorescence;cotton;OJIP curves;P availability;photosynthesis

期刊名称： Antioxidants

ISSN： 2076-3921

年卷期： 2023 年 12 卷 2 期

页码：

收录情况： SCIE（2023版）

摘要： Phosphorus (P) is an essential macronutrient, and an important component of plant metabolism. However, little is known about the effects of low P availability on P absorption, the photosynthetic electron transport chain, and the antioxidant system in cotton. This study used cotton genotypes (sensitive FJA and DLNTDH and tolerant BX014 and LuYuan343) with contrasting low-P tolerance in a hydroponic experiment under 15 µM, 50 µM, and 500 μM P concentrations. The results showed that low P availability reduced plant development and leaf area, shoot length, and dry weight in FJA and DLNADH, compared to BX014 and LuYuan343. The low P availability decreased the gas-exchange parameters such as the net photosynthetic rate, transpiration rate, and stomatal conductance, and increased the intercellular CO2 concentration. Chlorophyll a fluorescence demonstrated that the leaves’ absorption and trapped-energy flux were largely steady. In contrast, considerable gains in absorption and trapped-energy flux per reaction center resulted from decreases in the electron transport per reaction center under low-P conditions. In addition, low P availability reduced the activities of antioxidant enzymes and increased the content of malondialdehyde in the cotton genotypes, especially in FJA and DLNTDH. Moreover, low P availability reduced the activity of PEPC and generated a decline in the content of ATP and NADPH. Our research can provide a theoretical physiological basis for the growth and tolerance of cotton under low-P conditions.

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