Thermal Stress, Aggregation of Chlorophyll-Protein Complexes, and Light-Dependent Recovery of PSII activity in Wheat Seedlings

The dynamics of changes in the photochemical activity of photosystem II (PSII) and low-temperature spectra at 77 K in the first leaves of 11-day winter wheat plants Triticum aestivum L., as well as structural changes in chlorophyll-protein complexes (CPC) of thylakoid membranes during recovery after...

Full description

Saved in:
Bibliographic Details
Published in:Russian journal of plant physiology 2021-09, Vol.68 (5), p.867-872
Main Authors: Khristin, M. S., Smolova, T. N., Kreslavski, V. D.
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Chlorophyll
Electrophoresis
Fluorescence
Heating
Life Sciences
Low temperature
Luminous intensity
Photochemicals
Photosynthesis
Photosystem II
Plant Physiology
Plant Sciences
Proteins
Recovery
Research Papers
Seedlings
Thermal stress
Thylakoid membranes
Triticum aestivum
Wheat
Winter wheat
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The dynamics of changes in the photochemical activity of photosystem II (PSII) and low-temperature spectra at 77 K in the first leaves of 11-day winter wheat plants Triticum aestivum L., as well as structural changes in chlorophyll-protein complexes (CPC) of thylakoid membranes during recovery after a short-term (20 min) heating at a temperature of 42°C, were studied. Changes in the F v / F m , F735/F695, and F735/F685 ratios indicate inhibition of PSII immediately after heating. Using nondenaturing electrophoresis, it was shown that the light-harvesting Chl a / b complex of PSII does not aggregate immediately after heating but after several hours, after 6 h the desagregation of CPC was observed, which was consistent with an increase in the F v / F m ratio upon recovery. The influence of temperature, intensity, and quality of light (white, blue, and red light) on the recovery of PSII activity and low-temperature fluorescence spectra was studied. It was concluded that the recovery is a photo-activated low-energy process, independent of photosynthesis, and the most effective in blue light.
ISSN:1021-4437
1608-3407
DOI:10.1134/S1021443721050071