波动的光会诱导玉米中的光系统I显著的光抑制
Qiu-Yan Yang1, Xiao-Qian Wang2, Ying-Jie Yang3
1School of Life Sciences, Shannxi Normal University, Xi'an, 710119, China; Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China.
Plant physiology and biochemistry : PPB
|February 10, 2024
概括
像玉米这样的C4植物与C3植物不同地应对波动的光线. 玉米使用循环电子流 (CEF) 和质子梯度 (ΔpH) 来保护光系统I (PSI),与更多依赖光呼吸的C3植物不同.
科学领域:
- 植物生理学 植物生理学
- 光合作用研究研究 光合作用研究
- C4 光合作用的机制
背景情况:
- 波动的光 (FL) 构成植物光系统I (PSI) 的光损伤风险.
- 虽然C3植物对FL的反应得到了充分研究,但C4植物的应对策略仍然不清楚.
- 了解这些差异对于作物在可变光环境中的弹性至关重要.
研究的目的:
- 为了比较C4植物 (玉米) 和C3植物 (西红) 之间对FL的光合作用反应.
- 根据FL,研究在C4植物中的PSI光抑制和保护的基础机制.
- 阐明循环电子流 (CEF) 和质子梯度 (ΔpH) 在C4植物适应FL的作用.
主要方法:
- 在受控波动光条件下对玉米 (C4) 和西红 (C3) 的光合作用反应进行比较分析.
- 测量循环电子流 (CEF) 活动,光吸速率和PSI氧化还原状态.
- 评估跨甲基蛋白质梯度 (ΔpH) 动态和叶绿体ATP合成酶活性.
主要成果:
- 玉米表现出比番茄更高的CEF和较低的光吸.
- 玉米在阴影-太阳过渡期间显示出更大的短暂的PSI过度降低和随后的PSI光抑制.
- 在玉米中,CEF刺激和短暂的ATP合成酶下调迅速建立了ΔpH,弥补了较低的光呼吸.
结论:
- 与玉米一样,C4植物采用不同的策略,包括CEF和ΔpH调制,以管理FL并保护PSI.
- 这些机制部分地弥补了C4光合作用中光呼吸能力的减少.
- 这些发现突出了C3和C4植物之间对波动光的不同光合作用适应.
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