NDLI: Protection of winter rape photosystem 2 by 24-epibrassinolide under cadmium stress

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Protection of winter rape photosystem 2 by 24-epibrassinolide under cadmium stress

Content Provider	Springer Nature Link
Author	Janeczko, A. Koscielniak, J. Pilipowicz, M. Szarek Lukaszewska, G. Skoczowski, A.
Copyright Year	2005
Abstract	Seedlings of winter rape were cultured in vitro on media containing 24-epibrassinolide, EBR (100 nM) and cadmium (300 µM). After 14 d of growth, fast fluorescence kinetics of chlorophyll (Chl) a and contents of photosynthetic pigments and Cd in cotyledons were measured. Cd was strongly accumulated but its content in cotyledons was 14.7 % smaller in the presence of EBR. Neither Cd nor EBR influenced the contents of Chl a and b and carotenoids. Cd lowered the specific energy fluxes per excited cross section (CS) of cotyledon. The number of active reaction centres (RC) of photosystem 2 (RC/CS) decreased by about 21.0 % and the transport of photosynthetic electrons (ET$_{0}$/CS) by about 17.1 %. Simultaneously, under the influence of Cd, the activity of O$_{2}$ evolving centres (OEC) diminished by about 19.5 % and energy dissipation (DI$_{0}$/CS) increased by about 14.6 %. In the cotyledons of seedlings grown on media without Cd, EBR induced only a small increase in the activity of most photochemical reactions per CS. However, EBR strongly affected seedlings cultured with cadmium. Specific energy fluxes TR$_{0}$/CS and ET$_{0}$/CS of the cotyledons of plants Cd+EBR media were about 10.9 and 20.9 % higher, respectively, than values obtained for plants grown with Cd only. EBR also limited the increase of DI$_{0}$/CS induced by Cd and simultaneously protected the complex of OEC against a decrease of activity. Hence EBR reduces the toxic effect of Cd on photochemical processes by diminishing the damage of photochemical RCs and OECs as well as maintaining efficient photosynthetic electron transport.
Starting Page	293
Ending Page	298
Page Count	6
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	43
Issue Number	2
e-ISSN	15739058
Language	English
Publisher	Kluwer Academic Publishers-Consultants Bureau
Publisher Date	2005-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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