Water regime and photosynthetic apparatus functioning in some evergreen Ligustrum L. species under the hydrothermal stress
Abstract
The results of the studies in the real water deficit dynamics and leaf relative water content (RWC) in some evergreen Ligustrum L. species during the summer 2023 and 2024, as well as changes in water-holding forces and parameters of solar-induced chlorophyll fluorescence (SIF) under various combinations of air temperature and humidity have been presented.
It has been shown that under hydrothermal stress increase, the species L. delavayanum Har. and L. ovalifolium Hassk. were characterized by especially unstable water regime indicators. For the species L. compactum (Wall. ex G. Don) Hook.f. & Thomson ex Brandis and L. ovalifeolium, under conditions simulating dry winds, the least resistance to water stress has been revealed.
It has been found out that the dry wind imitation caused balance disruption between photochemical and enzymatic reactions and a slowdown in electron transport from the reaction center of PS II to plastoquinone in Ligustrum species. The functional link of PS II with high sensitivity to the water deficiency increase was a parameter characterizing the processes of primary charge separation in the electron-transport chain (oxidation/reduction of plastoquinones).
About the Authors
Yu. V. Plugatar
Никитский ботанический сад – Национальный научный центр РАН
Russian Federation
Russian Federation
R. A. Pilkevich
Никитский ботанический сад – Национальный научный центр РАН
Russian Federation
Russian Federation
V. N. Gerasimchuk
Никитский ботанический сад – Национальный научный центр РАН
Russian Federation
Russian Federation
T. B. Gubanova
Никитский ботанический сад – Национальный научный центр РАН
Russian Federation
Russian Federation
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Review
For citations:
Plugatar Yu.V., Pilkevich R.A., Gerasimchuk V.N., Gubanova T.B. Water regime and photosynthetic apparatus functioning in some evergreen Ligustrum L. species under the hydrothermal stress. Plant Biology and Horticulture: theory, innovation. 2024;(3 (172)):43-52. (In Russ.)
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