Cyclic Electron Flow Alleviates the Stress of Light Fluctuation on Soybean Photosynthesis

Yi Lei, Jing Gao, Qi Wang, Weiying Zeng, Dhungana Diwakar, Yaodan Zhang, Xianming Tan, Zudong Sun, Feng Yang () and Wenyu Yang
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Yi Lei: College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
Jing Gao: College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
Qi Wang: College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
Weiying Zeng: Cash Crops Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
Dhungana Diwakar: College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
Yaodan Zhang: College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
Xianming Tan: College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
Zudong Sun: Cash Crops Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
Feng Yang: College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
Wenyu Yang: College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China

Agriculture, 2024, vol. 14, issue 7, 1-12

Abstract: Crops often face light intensity fluctuations in natural settings. Intercropping is widely used to improve crop yield and resource utilization worldwide, but crops suffer from high-frequency and high-intensity light fluctuations due to mutual crop influence. Soybean is an important legume crop and is often intercropped with other crops, but little is known about soybean’s response to light fluctuation environments. Herein, three fluctuation frequencies (1, 10, and 20 min/cycle) were used to analyze soybean photosynthesis responses by measuring leaf growth, chlorophyll content, gas exchange, and electron transfer. Our data revealed that faster fluctuation frequencies led to the stronger suppression of soybean morphology and photosynthesis, with significant reductions of 31.31% and 21.58%, respectively. Damage to photosystems II (PSII) and I (PSI) also intensified, with significant decreases of 18.52% and 18.38% in their effective quantum yields Y(II) and Y(I). Additionally, increased fluctuation frequency exacerbated the consumption of the plastoquinone pool and linear electron flow but enhanced the cyclic electron flow across the thylakoid membrane and, thus, increased heat dissipation in PSII. Our findings indicate that an increased fluctuation frequency inflicted more severe damage on the soybean photosynthesis system. However, PSI-enhanced CEF improved NPQ and coordinated photoprotection to some extent.

Keywords: soybean; light fluctuation; chlorophyll; fluorescence; cyclic electron flow (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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