Effect of heat stress on the photosynthetic apparatus in maize (Zea mays L.) grown at control or high temperature

Sinsawat, V. and Leipner, J. and Stamp, P. and Fracheboud, Y. (2004) Effect of heat stress on the photosynthetic apparatus in maize (Zea mays L.) grown at control or high temperature. Environmental and Experimental Botany , 52 (2). pp. 123-129.

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The effects of short exposure to heat stress in the dark on maize seedlings grown at 25°C or 41°C were investigated by means of chlorophyll fluorescence and oxygen evolution. Exposure of plants grown at 25°C to 35°C for 20 min in the dark led to a transient inhibition (by about 50%) of the rate of photosynthesis, which recovered within 4 h. Treatments at temperatures above 45°C led to permanent damage; the plants did not recover within 96 h. In contrast, no damage occurred to plants grown at 41°C after exposure to temperatures up to 50°C. Improved thermo-tolerance as a result of high growth temperature was not related to the presence of zeaxanthin, since it did not accumulate in heat-stressed leaves in the dark. In plants grown at 25°C, measurements of the quantum yield of electron transport at PSII in leaves infiltrated with methylviologen (MV) indicated the presence of a heat-sensitive component of the photosynthetic apparatus, located downstream of photosystem II (PSII) and before the carbon cycle.

Item Type: Article
Author Affiliation: Institute of Plant Sciences, Swiss Federal Institute of Technology Zurich, Universitätstrasse 2, CH-8092 Zurich, Switzerland.
Subjects: Plant Physiology and Biochemistry > Plant Physiology
Plant Physiology and Biochemistry > Biochemistry
Environmental Science > Environment
Divisions: Maize
Depositing User: Sandhya Gir
Date Deposited: 19 Oct 2010 08:47
Last Modified: 19 Oct 2010 08:47
Official URL: http://dx.doi.org/10.1016/j.envexpbot.2004.01.010
URI: http://eprints.icrisat.ac.in/id/eprint/175

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