光抑制
700页
光系统II
类囊体
光系统
光系统I
光合作用
叶绿素荧光
生物物理学
生物
电化学梯度
光防护
光化学
叶绿素
光合反应中心
植物
化学
生物化学
叶绿体
基因
膜
作者
Shun-Ling Tan,Yingjie Yang,Tao Liu,Shi‐Bao Zhang,Wei Huang
出处
期刊:Plant Science
[Elsevier]
日期:2020-03-01
卷期号:292: 110371-110371
被引量:43
标识
DOI:10.1016/j.plantsci.2019.110371
摘要
Moderate heat stress is usually accompanied with fluctuating light in summer. Although either heat stress or fluctuating light can cause photoinhibition of photosystems I and II (PSI and PSII), it is unclear whether moderate heat stress accelerate photoinhibition under fluctuating light. Here, we measured chlorophyll fluorescence, P700 redox state and the electrochromic shift signal under fluctuating light at 25 °C and 42 °C for tobacco leaves. We found that (1) the thylakoid proton conductance was significantly enhanced at 42 °C, leading to a decline in trans-thylakoid proton gradient (ΔpH); (2) this low ΔpH at 42 °C did not decrease donor-side limitation of PSI and thermal energy dissipation in PSII; (3) the activation of cyclic electron flow (CEF) around PSI was elevated at 42 °C; and (4) the moderate heat stress did not accelerate photoinhibition of PSI and PSII under fluctuating light. These results strongly indicate that under moderate heat stress the stimulation of CEF protects PSI under fluctuating light in tobacco leaves.
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