Combining Ability and Heterosis for Grain Yield and its Component Traits in Rice(Oryza sativa L.)
The nature and magnitude of heterosis and combining ability was studied in 18 F1 hybrids involving three CMS lines and six testers using line Ã— tester analysis. The analysis of variance for combining ability of all the traits showed that variances due to treatments, parents, hybrids were highly significant. The line â€˜CRMS 32Aâ€™ and testers viz. â€˜Super rice-8â€™, â€˜R 1099-2569-1-1â€™ and â€˜Jitpitiâ€™ were identified as good general combiners. The significant differences between lines x testers interaction indicates that SCA attributed heavily in the expression of these traits and demonstrates the importance of dominance or non additive variances for all the traits. The hybrid â€˜CRMS 32Aâ€™/â€˜R 1099-2569-1-1â€™ and â€˜APMS 6Aâ€™/â€˜Super rice-8â€™ were promising for grain yield. The magnitude of relative heterosis, heterobeltiosis and standard heterosis were also estimated for different characters. A high degree of relative heterosis was observed for grain yield (20.45- 82.37%) in the hybrids viz., â€˜CRMS 32Aâ€™/â€˜Super rice-8â€™, â€˜APMS 6Aâ€™/â€˜Super rice-8â€™, â€˜APMS 6Aâ€™/â€˜Jitpitiâ€™ and â€˜CRMS 32Aâ€™/â€˜R 1099-2569-1-1â€™. While, a higher degree of: heterobeltiosis (13.60 -68.37%) was observed for grain yield in the hybrids viz., â€˜CRMS 32Aâ€™/â€˜Super rice-8â€™, â€˜CRMS 32Aâ€™/â€˜R 1099-2569-1-1â€™, â€˜APMS 6Aâ€™/â€™Super rice-8â€™ and â€˜APMS 6Aâ€™/â€™Jitpitiâ€™. A high degree of standard heterosis was observed for grain yield in the hybrid â€˜CRMS 32Aâ€™/â€˜R 1099-2569-1-1â€™. The hybrid â€˜CRMS 32Aâ€™/ â€˜R 1099-2569-1-1â€™ recorded a high degree of relative heterosis (62.01%), heterobeltiosis (57.35%) and standard heterosis (15.05 and 25.51% over check hybrids, â€˜Mahamayaâ€™ and â€˜Indirasonaâ€™, respectively) that can be tested on yield trials for its further testing over locations.
Distribution - Permissions - Copyright
Papers published in Notulae Scientia Biologicae are Open-Access, distributed under the terms and conditions of the Creative Commons Attribution License.
© Articles by the authors; licensee SHST, Cluj-Napoca, Romania. The journal allows the author(s) to hold the copyright/to retain publishing rights without restriction.
Open Access Journal - the journal offers free, immediate, and unrestricted access to peer-reviewed research and scholarly work, due SHST supports to increase the visibility, accessibility and reputation of the researchers, regardless of geography and their budgets. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles, or use them for any other lawful purpose, without asking prior permission from the publisher or the author.