1Department of Plant breeding and Genetics, Agricultural College and Research Institute, Madurai
2Department of Plant breeding and Genetics, Anbil Dharmalingam Agricultural College and Research Institute, Trichy
3Department of Seed science and Technology, Agricultural College and Research Institute, Madurai
4Department of Agronomy, Agricultural College and Research Institute, Madurai
*E-Mail: banumathysiva2004@gmail.com
Online published on 16 October, 2019.
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 Dhan201, MDU6xCR Dhan203, MDU6xIR 64Drt, MDU6xGP239, ADT(R) 45 xIR 64Drt 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.
L x T analysis, Combining ability, Standard heterosis, yield traits, Rice
