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Influence of variation potential on resistance of the photosynthetic machinery to heating in pea
Author(s) -
Sukhov Vladimir,
Surova Lyubov,
Sherstneva Oksana,
Vodeneev Vladimir
Publication year - 2014
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/ppl.12208
Subject(s) - photosynthesis , pisum , photosystem ii , biology , biophysics , photosystem , botany , photosystem i , sativum , assimilation (phonology) , linguistics , philosophy
Electrical signals [action potentials (APs) and variation potentials (VPs)] induced by local stimuli are a mechanism that underlies rapid plant response to environmental factors. Such signals induce a number of functional responses, including changes in photosynthesis. Ultimately, these responses are considered to increase plant resistance to stress factors, but this question has been poorly investigated. We studied the influence of VP on photosynthesis and resistance of the photosynthetic machinery to heating in leaves of pea ( Pisum sativum ). Localized burning induced a VP that decreased photosynthesis parameters [ CO 2 assimilation rate and quantum yields of photosystem I (PSI) and photosystem II (PSII)]. The photosynthetic response was initiated by a decrease in photosynthesis dark‐stage activity, which in turn increased resistance of PSI to heating. Three results supported this hypothesized mechanism: (1) the magnitude of VP ‐induced decrease in CO 2 assimilation and enhanced PSI resistance to heating were highly correlated; (2) the VP influence on PSI resistance to heating was suppressed under a low external CO 2 concentration and (3) decreasing external CO 2 concentration imitated the VP ‐induced photosynthetic response and increased PSI resistance to heating.