Studies on combining ability for grain yield and related traits in advanced breeding lines in rice (Oryza sativa L.)
The present investigation was undertaken to study the combining ability using 10 lines and 3 testers crossed in Line × Tester mating design. Resulting 30 F1’s were evaluated along with their parents in a replicated trial using randomized block design during Kharif season 2016-17 at Norman E. Borlaug Crop Research Centre Pantnagar, Uttarakhand, India. Genotypes were evaluated for grain yield per plant and its contributing characters. Among the lines UPR3912-21-2-1 and tester NDR359 exhibited a high general combining ability (GCA) for most of the characters under the study. The per se performance and specific combining ability (SCA) effects were in agreement with each other for seven hybrids namely Pant Sugandh Dhan17×NDR359, PD26×NDR359, PR113×NDR359, PD26×NDR359, PD26×PD24, Pant Sugandh Dhan17×PD24, PR113×PD24 for days to 50% flowering, the number of tillers, dwarfness, the number of panicles, panicle length, grain length and 1000 grain weight respectively. Cross PD26×NDR359 exhibited high SCA for number of panicles and both the parents were good general combiner for this character.
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