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Manipulation of glutathione reductase in transgenic plants: implications for plants' responses to environmental stress
Published online by Cambridge University Press: 05 December 2011
Synopsis
The activities of a number of enzymes of the ascorbate–glutathione pathway have been shown to rise under conditions of increased oxidative stress. The potential to alter the expression of specific enzymes of this pathway by genetic manipulation has provided the opportunity to attempt to develop transgenic plants with altered levels of oxidative stress defense enzymes which should have improved stress tolerances. We have cloned a cDNA for glutathione reductase from a higher plant (Pisum sativum L.) and have used this to construct chimeric genes for the expression of the pea enzyme in the chloroplast, mitochondrion or cytosol of transgenic tobacco plants. Some of the transformed lines with elevated levels of expression of glutathione reductase accumulate higher concentrations of glutathione and show increased tolerance to paraquat, however, no evidence was found for elevated tolerance to ozone fumigation.
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- Copyright © Royal Society of Edinburgh 1994
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