Abstract
Effect of varying level of alkalinity (pH 8.5, 8.8 and 9.2) induced by sodium carbonate on germination efficiency index, seedling growth, free proline and sugar content were recorded in embryo-axis of three rice genotype NDR-501, USAR-1, and IR-24 after 72, 96, 120 h of soaking. Germination efficiency index (GEI), seedling growth and sugar (reducing and non-reducing) decreased with increasing alkalinity levels as compared to control at all the stages of seedling growth. Free proline content of embryo-axis increased with increasing alkalinity levels at all stages of seedling growth. Since tolerant genotypes accumulated relatively more free proline, high sugar content and GEI than susceptible hence these parameter can be used as one of the indices for rapid screening of salt tolerant genotypes. Key words: Alkalinity, genotype, free proline, sugar, germination.
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