Effects of exogenous 24-epibrassinolide on the photosynthetic membranes under non-stress conditions.

Autor: Dobrikova AG; Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev, St. 21, Sofia 1113, Bulgaria. Electronic address: aneli@bio21.bas.bg., Vladkova RS; Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev, St. 21, Sofia 1113, Bulgaria., Rashkov GD; Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev, St. 21, Sofia 1113, Bulgaria., Todinova SJ; Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev, St. 21, Sofia 1113, Bulgaria., Krumova SB; Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev, St. 21, Sofia 1113, Bulgaria., Apostolova EL; Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev, St. 21, Sofia 1113, Bulgaria.
Jazyk: angličtina
Zdroj: Plant physiology and biochemistry : PPB [Plant Physiol Biochem] 2014 Jul; Vol. 80, pp. 75-82. Date of Electronic Publication: 2014 Mar 31.
DOI: 10.1016/j.plaphy.2014.03.022
Abstrakt: In the present work the effects of exogenous 24-epibrassinolide (EBR) on functional and structural characteristics of the thylakoid membranes under non-stress conditions were evaluated 48 h after spraying of pea plants with different concentrations of EBR (0.01, 0.1 and 1.0 mg.L(-1)). The results show that the application of 0.1 mg.L(-1) EBR has the most pronounced effect on the studied characteristics of the photosynthetic membranes. The observed changes in 540 nm light scattering and in the calorimetric transitions suggest alterations in the structural organization of the thylakoid membranes after EBR treatment, which in turn influence the kinetics of oxygen evolution, accelerate the electron transport rate, increase the effective quantum yield of photosystem II and the photochemical quenching. The EBR-induced changes in the photosynthetic membranes are most probably involved in the stress tolerance of plants.
(Copyright © 2014 Elsevier Masson SAS. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: