Sunoj V S J, Wen Y, Jajoo A, Short A W, Zeng W H, Elsheery N I, Cao K F
State Key Laboratory for Conservation and Utilization of Subtropical Agri-Bioresources and Guangxi Key Laboratory of Forest Ecology and Conservation, College of Forestry, Guangxi University, 530004 Nanning, Guangxi, China.
School of Life Science, Devi Ahilya University, 452017 Indore, India.
Photosynthetica. 2022 Sep 15;61(2):177-189. doi: 10.32615/ps.2022.039. eCollection 2023.
In the subtropics, a few tropical tree species are distributed and planted for ornamental and horticultural purposes; however, the photosynthesis of these species can be impaired by chilling. This study aimed to understand how these species respond to chilling. Light-dependent and CO assimilation reactions of six tropical tree species from geographically diverse areas, but grown at a lower subtropical site in China, were monitored during a chilling (≤ 10°C). Chilling induced stomatal and nonstomatal effects and moderate photoinhibition of PSII, with severe effect in . was little affected by chilling, with negligible reduction of photosynthesis and PSII activity, higher cyclic electron flow (CEF), and oxidation state of P700 (P700). Photoinhibition of PSII thus reduced electron flow to P700, while active CEF reduced oxidative damage of PSI and maintained photosynthesis during chilling. Studied parameters revealed that coupling between light-dependent and CO assimilation reactions was enhanced under chilling.
在亚热带地区，有一些热带树种被种植用于观赏和园艺目的；然而，这些树种的光合作用会受到低温的影响。本研究旨在了解这些树种对低温的响应方式。在低温（≤10°C）期间，监测了来自不同地理区域但在中国亚热带较低地区种植的六种热带树种的光依赖和CO同化反应。低温诱导了气孔和非气孔效应以及PSII的中度光抑制，其中 受到的影响较为严重。 受低温影响较小，光合作用和PSII活性的降低可忽略不计，循环电子流（CEF）较高，P700的氧化状态（P700）较高。因此，PSII的光抑制减少了流向P700的电子流，而活跃的CEF减少了PSI的氧化损伤并在低温期间维持了光合作用。研究参数表明，在低温下光依赖和CO同化反应之间的耦合增强。
