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变异电位对豌豆光合循环电子流的影响

Variation potential influence on photosynthetic cyclic electron flow in pea.

作者信息

Sukhov Vladimir, Surova Lyubov, Sherstneva Oksana, Katicheva Lyubov, Vodeneev Vladimir

机构信息

Department of Biophysics, N.I. Lobachevsky State University of Nizhny Novgorod Nizhny Novgorod, Russia.

出版信息

Front Plant Sci. 2015 Jan 7;5:766. doi: 10.3389/fpls.2014.00766. eCollection 2014.

DOI:10.3389/fpls.2014.00766
PMID:25610447
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4285888/
Abstract

Cyclic electron flow is an important component of the total photosynthetic electron flow and participates in adaptation to the action of stressors. Local leaf stimulation induces electrical signals, including variation potential (VP), which inactivate photosynthesis; however, their influence on cyclic electron flow has not been investigated. The aim of this study was to investigate VP's influence on cyclic electron flow in pea (Pisum sativum L.). VP was induced in pea seedling leaves by local heating and measured in an adjacent, undamaged leaf by extracellular electrodes. CO2 assimilation was measured using a portable gas exchange measuring system. Photosystem I and II parameters were investigated using a measuring system for simultaneous assessment of P700 oxidation and chlorophyll fluorescence. Heating-induced VP reduced CO2 assimilation and electron flow through photosystem II. In response, cyclic electron flow rapidly decreased and subsequently slowly increased. Slow increases in cyclic flow were caused by decreased electron flow through photosystem II, which was mainly connected with VP-induced photosynthetic dark stage inactivation. However, direct influence by VP on photosystem I also participated in activation of cyclic electron flow. Thus, VP, induced by local leaf-heating, activated cyclic electron flow in undamaged leaves. This response was similar to photosynthetic changes observed under the direct action of stressors. Possible mechanisms of VP's influence on cyclic flow were discussed.

摘要

循环电子流是光合电子流总量的重要组成部分，参与对胁迫因子作用的适应。局部叶片刺激会诱导电信号，包括使光合作用失活的变异电位（VP）；然而，它们对循环电子流的影响尚未得到研究。本研究的目的是探究VP对豌豆（Pisum sativum L.）循环电子流的影响。通过局部加热在豌豆幼苗叶片中诱导出VP，并通过细胞外电极在相邻的未受损叶片中进行测量。使用便携式气体交换测量系统测量二氧化碳同化。使用用于同时评估P700氧化和叶绿素荧光的测量系统研究光系统I和II的参数。加热诱导的VP降低了二氧化碳同化以及通过光系统II的电子流。作为响应，循环电子流迅速下降，随后缓慢增加。循环流的缓慢增加是由通过光系统II的电子流减少引起的，这主要与VP诱导的光合暗期失活有关。然而，VP对光系统I的直接影响也参与了循环电子流的激活。因此，局部叶片加热诱导的VP激活了未受损叶片中的循环电子流。这种反应类似于在胁迫因子直接作用下观察到的光合变化。讨论了VP影响循环流的可能机制。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0faf/4285888/9a3ffc7d2dc6/fpls-05-00766-g0010.jpg
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