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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Photosynthetic response of transgenic soybean plants, containing an Arabidopsis P5CR gene, during heat and drought stress
Journal of Plant Physiology, Volume 161, No. 11, Year 2004
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Description
The biochemical basis of heat/drought tolerance was investigated by comparing the response of antisense and sense transgenic soybean plants (containing the L-Δ1-pyrroline-5-carboxylate reductase gene) with non-transgenic wild-type plants. The plants were subjected to a simultaneous drought and heat stress of 2 days, whereafter they were rewatered at 25°C. During this time the sense plants only showed mild symptoms of stress compared to the antisense plants which were severely stressed. Upon stress, nicotinamide adenine dinucleotide phosphate (NADP+) levels decreased in antisense while it increased in sense plants. Recovery with respect to NADP+ levels was best in sense plants. Sense plants had the highest ability to accumulate proline during stress and to metabolise proline after rewatering. Analyses of the fast phase chlorophyll-a fluorescence transients showed dissociation of the oxygen-evolving complex (OEC) upon stress in all plants tested. In the sense plants, which best resisted the stress, OEC dissociation was bypassed by proline feeding electrons into Photosystem 2 (PSII), maintaining an acceptable nicotinamide adenine dinucleotide hydrogen phosphate (NADPH) level, preventing further damage. Upon recovery, NADPH is consumed during oxidation of accumulated proline providing high levels of NADP+ to act as electron acceptor to PSII, which indirectly may ameliorate the inhibition and/or the effect of uncoupling of the OEC. © 2004 Elsevier GmbH. All rights reserved.
Authors & Co-Authors
de Ronde, Jacoba A.
South Africa, Pretoria
Agricultural Research Council, Pretoria
South Africa, Durban
University of Kwazulu-natal
Switzerland, Geneva
Université de Genève
Cress, William A.
South Africa, Durban
University of Kwazulu-natal
United States, Fayetteville
University of Arkansas
Krüger, Gert H.J.
South Africa, Potchefstroom
North-west University
Strasser, Reto Jörg
South Africa, Potchefstroom
North-west University
Switzerland, Geneva
Université de Genève
van Staden, Johannes V.
South Africa, Durban
University of Kwazulu-natal
Statistics
Citations: 347
Authors: 5
Affiliations: 5
Identifiers
Doi:
10.1016/j.jplph.2004.01.014
ISSN:
01761617
Research Areas
Genetics And Genomics