波动光下光合作用的延迟响应造成大豆碳同化减少

doi:10.1016/j.jia.2024.07.032

摘要/Abstract

摘要：

田间生长的植物的光环境是高度动态的，不同物种对波动光（FL）的适应机制各异。大豆（Glycine max (L.) Merr.）在如何整合多种生理变化以适应FL方面仍存在不明确之处。本研究分析了在强弱光交替条件下大豆的光合气体交换参数和叶绿素（Chl）a荧光参数的变化，评估了FL条件对大豆形态和光合特性的影响。结果显示，FL处理下生长的大豆具有较低的干物质质量、小而薄的叶片和低的Chl a/Chl b，这些特征类似于在弱光环境中生长的大豆。然而，光合气体交换速率和光合能力保持恒定，与弱光处理有所不同。大豆对波动光和弱光的适应过程存在显著差异。相关性分析显示，在FL条件下，碳同化的降低主要由两个方面导致：由弱光过渡为强光时气孔导度增加缓慢以及再次转入弱光后非光化学猝灭的缓慢弛豫。因此，FL条件下碳同化的下降不能简单归因于弱光阶段的适应，而是由于光合作用的延迟响应造成的。

Abstract:

Plants experience dynamic light environments in the field, and the mechanisms for physiological and biochemical acclimation to fluctuating light (FL) vary among species. How soybean (Glycine max (L.) Merr.) integrates multiple physiological changes to acclimate to FL remains unclear. This study evaluated the impact of FL conditions on soybean morphology and photosynthetic characteristics by analyzing changes in photosynthetic gas exchange parameters and chlorophyll (Chl) a fluorescence parameters under alternating high and low light conditions. Results showed that soybeans subjected to FL conditions had low dry matter mass, small and thin leaves, and a low Chl a to Chl b ratio, resembling the traits of soybeans grown in low-light environments. However, their photosynthetic gas exchange rates and photosynthetic capacity remained constant, which was not the case under consistent low-light conditions. The adaptation processes for fluctuating and lowlight conditions are distinct. Correlation analyses indicated that the drop in carbon assimilation under FL primarily resulted from two aspects: the speed of recovery in stomatal conductance when transitioning to bright light and the slow relief of nonphotochemical quenching as light levels decreased. Thus, the decrease in carbon assimilation under FL conditions cannot be ascribed to adjustments during low-light phases but is due to a lag in photosynthetic response.

Key words: soybean , fluctuating light , , CO₂ assimilation , , dynamic photosynthesis , , photosynthetic limitation , , stomatal opening , , non-photochemical quenching

. 波动光下光合作用的延迟响应造成大豆碳同化减少[J]. Journal of Integrative Agriculture, DOI: 10.1016/j.jia.2024.07.032.

Jing Gao, Shenglan Li, Yi Lei, Qi Wang, Zili Ning, Zhaohong Lu, Xianming Tan, Mei Xu, Feng Yang, Wenyu Yang. Delayed photosynthesis response causes carbon assimilation reduction in soybean under fluctuating light[J]. Journal of Integrative Agriculture, DOI: 10.1016/j.jia.2024.07.032.

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