Dependence of fluorescence parameters on pigment and water content in vine leaves.
2020
The work deals with the study of the process of formation of photosynthetic apparatus during the annual ontogenesis with the use of fluorescence parameters of vine leaves. It is shown that in the newly emerging leaves, the reaction center of photosystem 2 (PS2) is less stable but normally functions, although the electron transport rate (ETR) between photosystems goes at a low intensity. A reduction of the relative water content (RWC) in the vine leaves to 53% significantly reduces the ETR, and the reaction center of PS2 becomes unstable. It was found that during a prolonged stress-induced influence of water deficiency, the reaction center of PS2 is irreversibly affected.
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