Dynamic responses of chlorophyll fluorescence parameters to drought across diverse plant families

IF 5.4 2区 生物学 Q1 PLANT SCIENCES Physiologia plantarum Pub Date : 2024-09-18 DOI:10.1111/ppl.14527
Yotam Zait, Or Emma Shemer, Amnon Cochavi
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Abstract

Chlorophyll fluorescence measurement is a quick and efficient tool for plant stress‐level detection. The use of Pulse amplitude modulation (PAM), allows the detection of the plant stress level under field conditions. Over the years, several parameters estimating different parts of the chlorophyll and photosystem response were developed to describe the plant stress level. Despite all fluorescence parameters being based on the same measurements, their relationship remains unclear, and their response to drought stress is significantly influenced by the incoming light intensity. In this study, we use six different annual plants from different families, both C3 and C4 photosynthesis types, to describe the plant response to drought through the fluorescence parameters response (NPQ, Y(NPQ), and qN). To describe the dynamic response to drought, we employed light‐response curves, adapting and fitting an equation for each curve to compare the drought response for each fluorescence parameter. The results demonstrated that the non‐photochemical quenching (NPQ) and the quantum yield of non‐photochemical quenching [Y(NPQ)] maximal values decrease when the PSII functionality (Fv/Fm) is lower than ~0.7. The basal fluorescence level ( and remained unaffected by the stress level and stayed stable across the various plants and stress levels. Our results indicate that the response of different stress parameters follows a distinct order under continuous drought. Consequently, monitoring just one parameter during long‐term stress assessments may result in biased analysis outcomes. Incorporating multiple chlorophyll fluorescence parameters offers a more accurate reflection of the plant's stress level.
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不同植物科叶绿素荧光参数对干旱的动态响应
叶绿素荧光测量是一种快速有效的植物胁迫水平检测工具。使用脉冲幅度调制(PAM)可以在田间条件下检测植物的胁迫程度。多年来,人们开发了多个估算叶绿素和光系统反应不同部分的参数来描述植物胁迫水平。尽管所有荧光参数都是基于相同的测量方法,但它们之间的关系仍不明确,而且它们对干旱胁迫的响应受入射光强度的影响很大。在本研究中,我们利用六种不同科属的一年生植物,包括 C3 和 C4 光合作用类型,通过荧光参数响应(NPQ、Y(NPQ) 和 qN)来描述植物对干旱的响应。为了描述对干旱的动态响应,我们采用了光响应曲线,为每条曲线拟合了一个方程,以比较各荧光参数对干旱的响应。结果表明,当 PSII 功能(Fv/Fm)低于 ~0.7 时,非光化学淬灭(NPQ)和非光化学淬灭量子产率[Y(NPQ)]最大值下降。基础荧光水平(并且不受胁迫水平的影响,在不同植物和胁迫水平下保持稳定。我们的研究结果表明,在持续干旱条件下,不同胁迫参数的反应顺序是不同的。因此,在长期胁迫评估中只监测一个参数可能会导致分析结果出现偏差。结合多个叶绿素荧光参数可以更准确地反映植物的胁迫水平。
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来源期刊
Physiologia plantarum
Physiologia plantarum 生物-植物科学
CiteScore
11.00
自引率
3.10%
发文量
224
审稿时长
3.9 months
期刊介绍: Physiologia Plantarum is an international journal committed to publishing the best full-length original research papers that advance our understanding of primary mechanisms of plant development, growth and productivity as well as plant interactions with the biotic and abiotic environment. All organisational levels of experimental plant biology – from molecular and cell biology, biochemistry and biophysics to ecophysiology and global change biology – fall within the scope of the journal. The content is distributed between 5 main subject areas supervised by Subject Editors specialised in the respective domain: (1) biochemistry and metabolism, (2) ecophysiology, stress and adaptation, (3) uptake, transport and assimilation, (4) development, growth and differentiation, (5) photobiology and photosynthesis.
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