An Estimation of Genetic and Genotype × Environmental Effects on some Quantitative Traits in Rice

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Seven rice varieties (Hassani, Deilmani, Sepidrod, Shahpasand, Saleh, Neda, and IRFAON215) along with their complete diallel progenies were grown in a randomized complete block design of three replications in the growing seasons of 2006 and 2007 and were evaluated for the quantitative traits of: number of days to flowering, flag leaf length, width and area, plant height, panicle length, extrusion length of panicle from sheath as well as grain yield. Analysis of variance indicated genetic differences among genotypes. General Combining Ability (GCA), Specific Combining Ability (SCA), reciprocal and non-maternal effects were significant for all the traits. Among genotype × year interactions, GCA×year were significant for flag leaf width, plant height, panicle length, extrusion length of panicle from sheath as well as for grain yield while SCA×year were significant for number of days to flowering, flag leaf width and area, panicle length, extrusion length of panicle from sheath and as well for grain yield. Dominance effect was predominant for flag leaf width and area and for panicle length, whereas additive effects were more prominent than the dominant ones for days to flowering, flag leaf length, plant height, extrusion length of panicle from sheath and as well for grain yield per plant. Therefore, selection for these traits can be useful in rice breeding programs.

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