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在东部白松和白杉的冬季光保护策略的差异

Amy Verhoeven¹, Joan Kornkven¹

¹Biology Department (OWS352), University of St Thomas, 2115 Summit Ave, St Paul, MN 55105 USA.

Tree physiology

|October 20, 2023

概括

针叶树使用散热来保护冬季的光合作用. 东部白松和白树表现出不同的恢复策略,因持续光保护机制的差异,树表现出更快的恢复.

科学领域:

植物生理学植物生理学
森林生态森林生态
光合作用研究研究光合作用研究

背景情况:

温带针叶树利用散热来防止冬季的光抑制.
东部白松 (Pinus strobus) 和白杉 (Picea glauca) 的冬季压力恢复率不同.
了解持续的散热机制对于针叶树的弹性至关重要.

研究的目的:

在春季恢复期间调查松树和杉树中持续的散热机制.
在东部白松和白杉之间比较光保护策略.
阐明色素循环和蛋白质酸化在冬季应激适应中的作用.

主要方法:

测量了叶绿素光度 (Fv/Fm),以评估光化学效率.
量化色素组成,重点是色素 (A) + 色素 (Z).
分析了关键光合作用蛋白质 (例如D1,LHCII) 的丰度和酸化状态.

主要成果:

这两种物种都利用了涉及 antraxanthin (A) + zeaxanthin (Z) 的持续消散,具有温度独立和零度以下依赖的形式.
树与松树不同,可以通过细胞染色体b6f和PSI调节循环电子运输.
零度以下的温度在两种物种中诱导了持续的D1蛋白酸化,并在松树中增强了LHCII和PSII核心蛋白酸化.

结论:

针叶树在应对冬季压力时表现出各种持续散热的策略.
的快速恢复与光合作用蛋白质的温度依赖酸化有关,可能有助于PSII-PSI能量转移.
灵活诱导持续消散和蛋白质酸化有助于在春季温度波动期间的光保护.

关键词:

针叶树的树木有没有循环电子运输是一种循环的电子运输.低温压力压力低温压力持续的散热是持续的散热.甲基胺蛋白质的酸化冬季的压力冬季的压力桑托菲尔 (Xanthophyll) 的一个周期.

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