Abstract
Eleven rice hybrids including two check varieties were evaluated to approximate their genetic variability, heritability and genetic advance for ten quantitative traits. The analysis of variance illustrated that all the quantitative traits differed significantly indicating that enough variation is presenting the studied materials. Among the desirable quantitative traits number of filled spikelet’s per panicle was found to have highest both phenotypic and genotypic variance followed by total number of spikelet’s per panicle. Almost all the characters showed a little variation between PCV and GCV revealing little influence of the environment on the expression of traits. High phenotypic and genotypic variance coupled with high heritability and high genetic advance was observed for number of filled spikelet’s per panicle, total number of spikelet’s per panicle, plant height and number of unfilled spikelet’s per panicle. Such findings stipulated that these traits were governed by additive gene actions which are fixable and these traits may be accounted for reliable index of selection. The genotypes G3 (IR79156A × EL108R) and G6 (IR79156A × EL253R) were selected as high response superior promising rice hybrids for achievable yield advantage 49% and 23%, respectively over best check varieties. Therefore, the G3 and G6 are proposed to be extensively evaluated for further trial of variety release.
 SAARC J. Agri., 18(2): 39-49 (2020)
Highlights
Sustainable food security is pivotal for the wellbeing of a nation
High genetic advance as percent of mean coupled with high heritability provides the most effective selection condition for a specific trait (Larik and Rajput, 2000)
MATERIALS AND METHODS Experimental site, plant materials and experimental design and procedures The present study comprised of nine F1 promising rice hybrids, combinations of BRRI35A × EL108R (G1), BRRI48A × EL108R (G2), IR79156A × EL108R (G3), BRRI35A × EL253R (G4), BRRI48A × EL253R (G5), IR79156A × EL253R (G6), BRRI35A × EL254R (G7), BRRI48A × EL254R (G8) and IR79156A × EL254R (G9) and two check varieties namely BRRI hybrid dhan4 (G10) and BRRI hybrid dhan6 (G11)
Summary
Sustainable food security is pivotal for the wellbeing of a nation. food security is threatened by a climate change, growing population, the loss of arable land to urbanization and reducing productivity. Is an evidence of vertical rice production technology (Oryza sativa L.), which could be a potential technological option for food security. The genus Oryza displays a wide range of genetic and phenotypic diversity because this wide range of growing habitat under diverse climatic conditions (Childs, 2004). High genetic advance as percent of mean coupled with high heritability provides the most effective selection condition for a specific trait (Larik and Rajput, 2000). The present study aimed to estimate the genetic parameters (genotypic and phenotypic coefficient of variation, heritability and genetic advance) among quantitative traits which are helpful in exposing and understanding the clear picture of existing variability in the genotypes as well as to identify the promising genotypes for further advancement of breeding trial
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