Photosynthetic mechanism of cotton under fluctuating light field planted with different densities

文献类型： 外文期刊

第一作者： Lei, Zhangying

作者： Lei, Zhangying;Li, Xilin;Zhang, Tong;Li, Xiaoming;He, Daohua;Li, Youzhong;Yang, Yanlong;Zhang, Yali

作者机构：

关键词： Plant density; Light intensity; Frequence of fluctuation light; Photosynthesis; Biomass

期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：6.2； 五年影响因子：6.2 ）

ISSN： 0926-6690

年卷期： 2025 年 228 卷

页码：

收录情况： SCI

摘要： Leaves, especially in the lower canopy, experience a complex and variable light condition that determines photosynthesis and biomass accumulation. However, the photosynthetic mechanism under fluctuating light filed remains controversial. We investigated leaf morphology, stomatal anatomy, gas exchange, chlorophyll fluorescence, proteomics, biomass, and yield in one field experiment (three plant densities of cotton) and two simulation experiments (light fluctuation frequency and intensity). Field experiment indicated that higher plant density significantly reduced light intensity but increased the frequency of light fluctuation in lower canopy, and this exerted a detrimental effect on leaf photosynthesis, biomass accumulation and yield. The simulation experiments revealed that increase in light intensity led to higher photosynthetic rate (AN) and biomass supported by enhancing leaf area, chlorophyll content, maximum photochemical efficiency, and stomatal conductance and density. Under the same light intensity, higher frequency of light fluctuation had no impact on AN and biomass owing to consistent trait variations regarding light harvesting and conversion, and carbon gain. Proteomic data also demonstrated that photosynthetic capacity was mainly determined by light intensity under fluctuating light field. Consequently, this study emphasizes an appropriate improvement of light intensity plays a crucial role in enhancing photosynthetic productivity and cotton yield under fluctuating light field planted with different densities.

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