Occurrence of high temperature concomitant with water deficit stress induces two different type of defense mechanism in higher plants, namely, induction of anti oxidant enzymes and specific HSPs in cytoplasm as well as in organelles like endoplasmic reticulum, mitochondria and chloroplast. Induction of antioxidant enzymes are reported under most type of abiotic stresses including high temperature stress. There is direct relationship exists between antioxidant enzyme activities like SOD, peroxidase, catalase, ascobate peroxidase (in chloroplast), glutathione reductase etc., with high temperature tolerance in many plant species.
Dr. K. Annamalainathan
Thanks for the clarification Dr. K. Annamalainathan. if there is any reference paper which clearly mention this relationship, kindly share with me.
Abiotic and biotic stresses induce antioxidant enzymes in plants. After experiencing stress the ROS in cells will increase and the result is different damages like membrane oxidation, protein and DNA damage. Each one of these organs produce specific biomarkers. For example biomarker of membrane damage is Malondealdehye(MDA) and for protein is Dityrozin and for DNA is Dihydroxyguanozin. So in stress condition both of antioxidant enzymes and biomarkers improve in the cells.The important point is the ratio of antioxidants to biomarkers. This ratio shows the situation of cells health. For example the higher ratio of SOD to MDA shows healthier cell. I have found in my research ratio of all enzymatic and non-enzymatic antioxidant to all biomarkers introduce better the resistant genotypes. Coming to your question, I think in all stress studies the measurement of this ratio will help us to find resistant genotypes and of course there is close relation between temperature stress and antioxidant enzymes.After all we have to find correlation analysis between this ratio and yield of the plant.(If you are working on plants).I hope my comments help you.
Protective role of antioxidant enzymes under high temperature stress
Moaed Almeselmani, , , P.S. Deshmukh, R.K. Sairam, S.R. Kushwaha, T.P. Singh
Plant Science
Volume 171, Issue 3, September 2006, Pages 382–388
Davood Habibi, Thanks for your answer, its really helpful and i do work on plant (wheat).
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