An Analysis of the Total Protein and Genetic Components for Yield and Its Constituents in some Hy-brid Rice (Oryza sativa L.)

Abstract

Rice is the most widely cultivated cereal crop in tropical and subtropical regions around the globe. Rice is also the most commonly ingested staple food by a large portion of the global population. A line × tester experiment was conducted during 2018 and 2019 seasons to evaluate the combining ability, gene action, and heterosis for its yield characters. During 2018 season, four lines were crossed with seven testers in a line-testing method, yielding twenty-eight F1 hybrids. On May 1 of 2019, a randomized complete block design with three replications was used to generate the twenty-eight hybrids and their parents. Number of panicles per plant, panicle length (cm), panicle weight (g), seed set (%), 1000 grain weight (g), and grain yield per plant (g) were all investigated in the data. Analysis of variance revealed significant differences among the lines, testers, and line × testers for the yield and its components. Within CMS lines, G46A had the highest GCA for most of the studied characters. G178M4, Giza 178 Im, and Giza 179 Im represented good general combiners for most testers’ tested characters. G46A × Giza178 and G46A × G178M3, IR69625A × Giza178 Im, IR79575A × Giza 179 Im, IR79575A × Giza 178M4, and IR70368A × Giza 178M1, G46A × Giza 179 Im, and IR79575A × Giza 178M4 showed desirable values for specific combining ability (SCA) for all of the evaluated traits.