2024, Vol. 6, Issue 4, Part A

Author(s): Mohammad Sharif Raihan, Albatross Tiaba, Rokaiya Khanom, Akbar Hossain, Mobinur Rahman, Sazia Islam Liya, and Mushfika Tasneem Maliha

Abstract: An investigation was commenced to examine the genetic aspects of yield and yield contributing characters in rice using 6×6 diallel population without reciprocal. Analysis of variance (ANOVA) revealed highly significant (p<0.001) variations among the genotypes for all the characters except grain width (cm) and grain test weight (g/5 ml). The estimates of components of variances demonstrated the involvement of both additive and dominant components in the inheritance of all the traits under study. The dominance component (H1) was greater than additive component (D) for all the characters except days to 1st flowering, plant height at maturity (cm), grain length (mm) and 1000-grain weight (g), indicating preponderance of dominance component in the inheritance of these traits. The components of variation due to dominance effect of the genes (H₁) was greater than H₂ component for all the characters indicating the presence of unequal proportion of positive and negative alleles in the loci governing the characters. Differences between parents and hybrids were substantiated by significant h² value for the traits plant height at maturity (cm), number of tiller per hill, number of panicle per hill, panicle length (cm), number of filled grain per panicle and 1000-grain weight (g). Environmental heterogeneity about the distribution was recorded only for days to1^st flowering. Value) suggested partial dominance for days to 1^st flowering (0.169), plant height at maturity (0.718), grain length (0.876) and 1000-grain weight (0.506) whereas over dominance was recorded for rest of the traits. Positive or negative alleles irrespective of dominance or recessive were asymmetrically distributed in the parents for the all the traits. Dominant and recessive genes were equally distributed in the parental genotypes for all the characters except days to maturity, pollen fertility (%), plant height at maturity (cm) and number of filled grain per panicle. h²/H₂ had a value greater than unity for the characters days to 1^st flowering (2.50), plant height at maturity (1.27), number of tiller per hill (1.39), number of panicle per hill (1.66) and 1000-grain weight (1.21) indicating that these characters were controlled by more than two genes or group of genes. Exclusively high narrow sense heritability was recorded for days to 1^st flowering (89.2%), grain length (82.2%) and 1000-grain weight (90.1%).

DOI: 10.33545/27068919.2024.v6.i4a.1143

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