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Pakistan Journal of Biological Sciences
  Year: 2002 | Volume: 5 | Issue: 1 | Page No.: 1-5
DOI: 10.3923/pjbs.2002.1.5
 
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Heterosis and Genetic Analysis in Rice Hybrids

Umakanta Sarker, P. S. Biswas, B. Prasad and M. A. Khaleque Mian

Abstract:
Two line x 13 tester mating design along with 15 rice genotypes and their 26 F1s were used to study the heterosis as well as combining ability of yield and 7 yield contributing characters. Highly significant genotypic differences were observed. The SCA variances were found highly significant while GCA variances were insignificant for all the characters. The highest heterosis (100.70%) was observed in cross IR62829A x IR44675R followed by other 17 crosses for yield and most of its related traits. The contribution of testers was observed to be higher than that of the interactions of line x tester except panicle weight that revealed the higher estimates of GCA variance I. e., additive gene action among the testers used. Except panicle weight, mean performance of parents for all the traits were strongly and positively correlated with GCA effects. Within CMS parents, IR62829A was found to be good general combiner for most of the traits. Among male parents, BR827R, IR44675R, IR55838R, IR21567R and IR50404R were observed to be good general combiners for most of the characters studied. The cross combinations IR62829A x IR44675R, IR58025A x IR46R, IR58025A x BR736R, IR58025A x IR50404R, IR58025A x IR32809R, IR58025A x AjayaR, IR58025A x IR55838R and IR62829A x IR21567R were observed to be good specific cross combinations for grain yield and most of other 7 yield related traits due to highly significant SCA and heterotic effects. In several cases, cross between high x high general combiner did not produce good specific cross. Rather good specific crosses were obtained from high x high, high x low, low x high and low x low general combiner indicating predominance of non-additive gene action.
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How to cite this article:

Umakanta Sarker, P. S. Biswas, B. Prasad and M. A. Khaleque Mian, 2002. Heterosis and Genetic Analysis in Rice Hybrids. Pakistan Journal of Biological Sciences, 5: 1-5.

DOI: 10.3923/pjbs.2002.1.5

URL: https://scialert.net/abstract/?doi=pjbs.2002.1.5

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