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基于光的初级生产率估计受到北极浮游植物中非光化学火动态的影响

Yayla Sezginer¹, Douglas Campbell², Sacchinandan Pillai¹

¹Department of Earth Oceans and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada.

Frontiers in microbiology

|December 25, 2023

概括

在北极植物浮游生物中非光化学火 (NPQ) 放松因物种和条件而异,影响初级生产率估计. 了解NPQ动力学对于准确测量极地水域的光合作用活动至关重要.

科学领域:

海洋浮游植物生理学海洋浮游植物生理学
光合作用研究研究光合作用.
大洋地区的初级生产率.

背景情况:

基光测量初级生产率往往需要黑暗或低光预处理来放松非光化学火 (NPQ).
在植物浮游生物种群和环境条件之间,NPQ放松时间表有很大差异,这给基于现场的生产率估计带来了不确定性.
对NPQ放松的准确表征对于可靠的光合作用电子传输速率现场测量至关重要.

研究的目的:

用快速重复率度 (FRRF) 来描述北冰洋植物浮游生物组合中的NPQ放松动力学.
确定NPQ放松动态对光合作用电子传输速率 (ETR) 估计的影响.
研究北极浮游植物中NPQ,光吸收和光化学量子效率之间的关系.

主要方法:

利用快速重复率度 (FRRF) 来测量北极浮游植物中的NPQ放松动力学.
应用了数值匹配来描述放松时间尺度和不同火元件的贡献.
在NPQ放松过程中分析了PSII功能吸收截面 (σPSII) 和Fv/Fm的脱.

主要成果:

通过快速 (秒),中间 (分钟) 和缓慢 (小时) 的过程来描述NPQ放松动力学,其中中间成分占主导地位.
平均NPQ放松寿命为20±1.9分钟,在高光适应表面样本中观察到更快的放松.
在NPQ放松过程中观察到σPSII和Fv/Fm之间的显著脱,特别是在光抑制样本中,导致可变ETR估计.

结论:

北极植物浮游生物中的NPQ放松是复杂的,受到光适应和环境条件的影响.
假设NPQ对光吸收和光化学效率的比例影响并不总是有效的.
这些发现对使用FRRF来获得极地海洋生态系统中光合作用活动的准确,非侵入性估计有重大影响.

关键词:

北极的植物浮游生物是北极的.叶绿素的光效应叶绿素的光非光化学火 (NPQ) 是一种非光化学火方法.光合作用电子传输速率主要生产率的初级生产率.

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