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IMPACT OF SALINITY ON ANTIOXIDATIVE ENZYMES AND METABOLITES RESPONSE IN TWO RICE CULTIVARS
R. SHASHIKUMARA, KIRAN KAMALAKAR MIRAJKAR, SUPREETH S. KULKARNI, ARVIND KUMAR, RENUKA SUDARSHAN PATIL

Published in: International Journal of Agriculture Sciences
Volume- 9, Issue-44, pp.4725-4732, Sep 2017
DPI :-> 16.10077.IJAS.2017.V9I44.47254732.2029



Abstract
Soil salinity, due to varying salt levels that occur in large terrestrial areas of the world severely affect crop yield. The present investigation was taken up to describe the potential biochemical and enzymatic responses in the leaves and roots of two rice cultivars CSR-23 (tolerant) and BPT- 5204 (sensitive) to different salt concentrations. Here, we observed significant changes in the biochemical and enzymatic responses between control and treatments as well as between the genotypes. The salt sensitive variety i.e. BPT 5204 exhibited high reducing sugar and total phenol contents, compared to salt tolerant variety CSR 23. Catalase activity was significantly higher in leaves (46 %) and roots (5.5 %) of CSR 23 compared to BPT 5204. CSR 23 also showed an elevated Superoxide dismutase (SOD) activity in leaves (45.5 %) and roots (12.4 %) compared to BPT 5204. Similarly, Glutathione Reductase increased in the leaves (85 %) and roots (91.5 %) of CSR 23 as compared to BPT 5204. Highest nitrate reductase activity was observed in leaves of CSR 23(48 %) compared to BPT 5204, whereas there was no significant change in case of roots. BPT 5204 showed significantly higher NiR activity in leaves (18.3 %) and roots (17.5 %) as compared to CSR23. BPT 5204 showed significantly higher Total chlorophyll content in leaves and decreased in CSR 23 (25 %). The salt-tolerant cultivar CSR23 resisted salinity stress due to its ability to surmount oxidative stress via up-regulation of anti-oxidative enzymes and nitrogen assimilating enzymatic activities.

Key-Words / Index Term
Salinity, anti-oxidative enzymes, catalase, superoxide dismutase, resistance

How to cite this article
R. SHASHIKUMARA, KIRAN KAMALAKAR MIRAJKAR, SUPREETH S. KULKARNI, ARVIND KUMAR, RENUKA SUDARSHAN PATIL , “IMPACT OF SALINITY ON ANTIOXIDATIVE ENZYMES AND METABOLITES RESPONSE IN TWO RICE CULTIVARS”, International Journal of Agriculture Sciences, 9, Issue-44, pp.4725-4732, Sep 2017. DPI:16.10077.IJAS.V9.I44.2029