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Abstract
The effect of NaCl stress was studied in indica rice cultivars, Panvel-3 (tolerant), Kalarata (moderately tolerant) and Karjat-3 (sensitive) under various levels (50 – 300 mM) of salinity besides control (0 mM). Salinity stress decreased germination percentage, plant growth, biomass production and chlorophyll pigments, and increased malondialdehyde level (lipid peroxidation) and free proline accumulation. Salinity-induced decrease in germination percentage, biomass production, chlorophyll and total protein contents were significantly higher in Karjat-3 than Panvel-3. The free proline content at all the levels as well as the magnitude of increase in accumulation with increasing salinity was also highest in Panvel-3, as at 300 mM NaCl concentration, it was 8 times more than control, while it was about 5 times more in Karjat-3 and around 4 times in Kalarata. The level of lipid peroxidation was lowest at all levels of salinity in Panvel-3 as compared with Karjat-3, however, Kalarata showed intermediate results. Results showed salinity tolerance of Panvel-3 was manifested by lower decrease in germination, plant growth and chlorophyll pigments and associated with higher proline accumulation and lower lipid peroxidation under high salinity stress.
Acknowledgements
This work was supported by grant from Board of Research in Nuclear Sciences, Department of Atomic Energy, Government of India (Grant No. 2004/37/28/BRNS) to MGS and research fellowship to the first author. The authors also acknowledge the facilities used for this work at the Department of Botany, University of Pune created under ASIST and DRS-SAP programs of University Grants Commission, India.