Year: 2013 | Month: December | Volume 6 | Issue 4
Genetic Analysis of Sodicity Tolerance in Rice (Oryza Sativa L.)
Abstract: <div>In order to estimate gene actions for sodicity tolerance, grain yield and its related traits in rice, six basic generations were evaluated in a randomized complete block design with three replications. Inheritance of salinity tolerance was determined in a cross between two rice cultivars, “ASD 18” (P1) a susceptible cultivar and “TRY” (R) 2 (P2) a tolerant one. The parents, F1, F2 and backcross generations were studied under sodic environment. The parents, F1, F2 and backcross generations were studied under</div><div>sodicity conditions (Exchangeable Sodium Percentage 23). The data on 10 physio-morphological traits viz., days to 50 per cent flowering, plant height, number of productive tillers per plant, panicle length, spikelet fertility percentage, single plant yield, Na+: K+ ratio, proline content, chlorophyll a/b ratio and chlorophyll stability index were recorded. Generation means analysis of the data revealed that all these traits exhibit significant non-allelic interactions and suggest that complex epistatic interactions are more important in controlling sodicity tolerance traits. The simple additive dominance model was adequate to explain the inheritance of chlorophyll stability index. Due to the presence of greater non-additive gene effects, selection for almost all of the studied traits in this cross, especially in early generations, would be complex in conventional methods. Regarding the existence of additive and</div><div>non-additive effects in controlling traits in this cross, inter se mattings followed by pedigree method of breeding might prove useful in improving sodicity tolerance in rice.</div>
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