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Fourteen rice genotypes comprising of landraces, high yielding varieties (HYVs) carrying Sub1 allele as well as without Sub1 allele contrasting in their tolerance to submergence stress were evaluated for plant survival, growth and yield response under submergence stress during kharif season of 2011 and 2012. Decline in yield was observed almost in all the rice genotypes grown under submergence stress as compared to control condition. Under short term submergence, rice genotypes carrying Sub1 allele survived complete submergence up to 14 days, whereas genotypes without Sub1 did not survive significantly and gave very low yield. The decline in yield in rice genotypes under stress (submerged) condition ranged from 1.5 to 97 %. Under control condition HYVs with and without Sub1 allele showed non significant differences in grain yield, but showed an average yield advantage of more than 2.5 t ha−1 over landraces. Non significant difference were observed in landraces for grain yield under submergence and control treatments indicating considerable submergence tolerance. Landraces and HYVs carrying Sub1 showed higher survival percentage after submergence than the susceptible parents and check variety IR 42. Variance studies revealed significant differences among genotypes for yield attributing traits. Correlation studies revealed that genotypes with the capacity to maintain higher biomass, higher chlorophyll and higher starch and sugar concentrations after submergence had higher survival of seedling and grain yield. Present study suggested that submergence tolerance related genes from landraces like Atiranga, Gangasuili and Kalaputia apart from FR 13A need to be identified for introgression into HYVs for successful exploitation of low lying flood prone ecosystem.
Indian Journal of Plant Physiology – Springer Journals
Published: Dec 10, 2013
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