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International Journal of Pure & Applied Bioscience (IJPAB)
Year : 2018, Volume : 6, Issue : 1
First page : (497) Last page : (510)
Article doi: http://dx.doi.org/10.18782/2320-7051.5199

Combining Ability and Gene Action in Hybrid Rice

Chethri Ramesh*, Chennamadhavuni Damodar Raju, Chennamadadhavuni Surender Raju and N. RamaGopala Varma
Rice Research Centre, Agricultural Research Institute
Professor Jayashankar Telangana State Agriculture University, Hyderabad - 500030
*Corresponding Author E-mail: chethriramesh@gmail.com
Received: 12.07.2017  |  Revised: 20.08.2017   |  Accepted: 24.08.2017  


A study of combining ability was conducted on 24 hybrids along with the 11 parents (3CMS female lines and 8 male lines) to know the pattern of inheritance of some morphological traits for selecting superior genotypes. The experiment was carried out according to line x tester mating design, during 2015-16. Analysis of Variance (ANOVA) for combining ability revealed significant differences among treatments, parents, crosses and line x tester interactions. Among lines plant height, grain length and grain breadth were showed significant differences out of sixteen characters. Among testers number of unproductive tillers per plant, flag leaf width, 1000 grain wt, length-breadth ratio were showed significant differences. Variances of SCA  were higher than GCA in traits like days to 50% flowering, number of productive tillers per plant, number of unproductive tillers per plant, flag leaf length, flag leaf width, 1000 grain wt and grain length-breadth ratio which indicated these traits are governed by Non-additive gene effect. The proportional contribution of lines and testers were more than the interactions of the line X tester revealed the higher estimates of GCA variance that is additive gene action among the testers and lines were used. Among crosses IR 58025A x RNR 21301, JMS 13A x RNR 2604 and IR 58025A x RNR 21218 were identified as good specific combinations for grain yield and all other traits related to yield.

Key words: grain length, grain breadth, High GCA - Additive and High SCA - Non-Additive.

Full Text : PDF; Journal doi : http://dx.doi.org/10.18782

Cite this article: Ramesh, C., Raju, C.D., Raju, C.S. and Varma, N.R.G., Combining Ability and Gene Action in Hybrid Rice, Int. J. Pure App. Biosci.6(1): 497-510 (2018). doi: http://dx.doi.org/10.18782/2320-7051.5199