Author(s):

Sandeep Kumar Singh, Sumant Bindal, Anupam Singh and Seweta Srivastava

Abstract: The present study was conducted to analyze the combining ability for yield and its contributing traits in rice (Oryza sativa L.). Rice, being a staple food for more than 70 per cent of national population is the source of livelihood for 120-150 million rural households. The major objective of a plant breeder is to create genetic variability upto maximum extent possible in the existing germplasm because the genetic variability and combining ability estimates provide the basis for selection of suitable genotypes in any breeding programme. The combining ability effects, which are supposed to be manifestation of non-additive components of genetic variance, are valuable for discrimination of superior crosses for their genetic worth as breeding materials. The estimates of combining ability of 39 crosses for 12 characters were analyzed during the experiment. Six crosses, NDRK 2011-18 x Gujarat 70, CSR 36 x CSR 43, Sarjoo 52 x Pusa Sugandha 4, NDRK 2011-19 x Pusa Sugandha 4, NDRK 2011-17 x CSR 43 and Sarjoo 52 x CSR 43 showed significant and positive combining ability effects for grain yield per plant as well as some other yield components. In general, the crosses showing significant and desirable combining ability effects were associated with better per se performance for the respective traits.

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