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|Title:||Salt stress Induced Changes on Enzyme Activities during Different Developmental Stages of Rice (<i>Oryza sativa</i> Linn.)|
|Authors:||Swapna, T S|
Peroxidase and catalase
|Abstract:||The effect of NaCI stress was studied in four rice varieties, 'Pokkali'- (salt tolerant variety), 'MI 48', 'Annapoorna' and 'Jyothi'- (salt sensitive varieties). The enzymes-esterase, isocitric dehydrogenase, superoxide dismutase, peroxidase and catalase were studied in different developmental stages such as embryo, 14-day-old seedling, tillering and flowering stage, and in undifferentiated embryo derived callus, before and after giving NaCI stress (100 mM). Esterase activity was found to be higher in embryo stage and isocitric dehydrogenase activity was higher in callus, but the stress caused a reduction in activity of these two enzymes during other developmental stages. An increase in activity of superoxide dismutase and peroxidase was also observed during the different developmental stages under stress. There was a fluctuation "incatalase activity under NaCI stress during the different developmental stages in all the varieties. Variety specific and developmental stage specific variation was found in activity of all the enzymes studied and can be reflected in metabolic processes which, when well-defined can serve as markers for salt tolerance.|
|ISSN:||0975-0967 (Online); 0972-5849 (Print)|
|Appears in Collections:||IJBT Vol.02(2) [April 2003]|
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