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Line x tester analysis for identification of CMS and restorer lines in rice (Oryza sativa L.)

Hossain, M.A. and Haque, M.E. (2003) Line x tester analysis for identification of CMS and restorer lines in rice (Oryza sativa L.). Bangladesh Journal of Botany, 32 (2). pp. 71-75.


Line x tester analysis using two cytoplasmic male sterile (CMS) lines and 11 restorer lines was carried out to assess the nature of combining ability for yield and six other quantitative characters in rice. It was revealed that variances due to line x tester were significant for all the characters. The estimates of general combining ability (δ 2 gca), specific combining ability (δ 2 sea) and their ratios indicated the preponderance of non-additive type of gene actions for days to flowering, panicle/hill, grain/panicle and sterility (%), where plant height, 1000 grain weight and yield/sqm, indicated both additive and non-additive gene action. Line IR62829A was the best general combiner for yield but both line IR62829A and IR58025A for plant height and DTF, where grain weight for IR58025A based on the objectives of selection. Among the restorers, only IR50404R was obtained as the best combiner for all the characters. Restorers, BR736R, BR827R, IR29723R, IR48725R, AjayaR, Gui99R and MH77R were good general combiners for most of the characters. In case of specific combiners for yield, crosses between good general combiners did not always produce good specific crosses. Mostly, good specific cross combinations were obtained from both good x poor and poor x poor crosses. It was true for DTF and panicle/hill. On the other hand, good specific crosses for plant height, sterility (%) and 1000 grain weight were obtained from the crosses between all types of parents.

Item Type: Journal Article
Publisher: Bangladesh Botanical Society
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