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Genetic Variability in F2 Generation for Some Physio-Morphological Characteristics in Rice

Ali EL Badri, Galal Anis, Ahmed Hefeina, Celaleddin Barutçular, Ayman EL Sabagh

Abstract


The objectives of this study were to estimate the phenotypic and genotypic variance (PV and GV), genetic coefficient of variation (GCV), phenotypic coefficient of variation (PCV), heritability in broad sense (H2b) and genetic advance under selection at 5% plant (GS) in F2 populations. The results indicated that, the mean squares for all crosses were found to be highly significant indicating over all differences among these populations for all characteristics. While, the number of days to heading the highest GCV (%) was found for cross Sakha104 x Gz7576-10-3-2-1 indicated that the genetic variance played an important role in the inheritance for this cross. However, the PCV (%) was higher than GCV (%) in all crosses for all traits but, the most portion of PCV was more contributed by the genotypic component than by environmental one. Concerning to 1000-grain weight, high heritability estimates ranged from 68.01% for the cross Sakha104 x Sakha106 to 93.59% for the cross Sakha106 x Shien2. The results showed that the possible gain from selection as percent in crosses in F3 generation over the F2 generation mean performances when the most desirable 5% of the best F2 plants are studied. The heritability estimates for spikelets fertility (%) more than 80% for all crossed under investigation, thus, the selection procedures deprecated on the additive and non-additive genetic variance in the inheritance of this trait for all crosses. Concerning to panicle density, the highest hybrids i.e., Sakha106 x Gz7576-10-3-2-1 and Sakha104 x Sakha106 which had relatively higher, and moderate to high genetic variance (%) and h2b (%), and also showed the highest values of most genetic studied parameters, indicating that the ability of selecting plants with narrow panicle density for their F2 and later segregating population.

Keywords


Rice, F2 generation, Genetic variability, heritability, physio-morphological.

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References


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