Genetic variation for grain yield, yield components and qualitative traits in rice (Oryza sativa L.) mutants

摘要

A study was performed to select the most successful rice mutants and to estimate the heritability of grain yield and some agro-morphological and quality traits. 65 rice genotypes including four local landraces (Hashemi, Tarom, Alikazemi and Sangjo), four released cultivars (Khazar, Fajr, H.P and Sephidrod) and 57 mutant lines (M5) were studied. The experiment was carried out during the spring of 2013-14 at Rice Research Institute of Iran (RRII) in Rasht. Analysis of variance indicated significant effects of genotype on all of the traits. Higher genotypic (GCV) and phenotypic coefficient of variation (PCV) were obtained for number of unfilled grains and grain yield. In general, very narrowly differences between PCV and GCV indicated fewer influence of environment on all of the studied traits. Broad sense heritability and genetic advance over mean were high for panicle weight, panicles per plant, number of filled grains, number of unfilled grains and grain yield. The high genetic advance over mean coupled with moderate to high heritability suggested the importance of additive gene action for the above mentioned traits. Mutant TM6-B-7-1 had high grain yield, panicles per plant, plant height, spikelets per panicle, panicle weight and hundred grain weights and can be used for future breeding programs to incorporate these characters in local genotypes.