Heterosis and combining ability for yield and yield attributing traits in rice
In the present investigation, combining ability study was undertaken by crossing four rice lines and five testers in Line x Tester fashion. The ratio of GCA and SCA was less than unity for all the characters which revealed the predominance of non additive gene action in the inheritance of these traits. Based on the gca effects, four parents viz., MDU 6, ADT (R) 45, IR 64 Drt and CR Dhan 203 were identified as the best combiners for yield and various yield attributing traits. Hence, there is a possibility of getting desirable segregants from the better combining hybrids viz., MDU 6 x IR 64 Drt, ADT (R) 45 x IR 64 Drt and MDU 6 x CR Dhan 203 for yield and yield attributing characters. The cross combinations viz., MDU 6 x CR Dhan 201, MDU 6 x CR Dhan 203, MDU 6 x IR 64 Drt, MDU 6 x GP 239, ADT (R) 45 x IR 64 Drt and ASD 16 x IR 64 Drt with more than 20 per cent standard heterosis for single plant yield were identified as high yielder. Among these, three hybrids MDU 6 x IR 64 Drt, ADT (R) 45 x IR 64 Drt and MDU 6 x CR Dhan 203 had high heterotic performance along with significant sca effects.
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