Genetic variability studies on rice (Oryza sativa L.) mutants for yield and yield components in normal and saline stress soil
Abstract
The present study was carried out to assess the genetic variability, heritability, genetic advance for yield and yield component characters in four hundred mutant lines of Rice. The crop was raised during kharif 2013 at Agricultural Research Station (ARS), Gangavathi, University of Agricultural Sciences, Raichur, Karnataka. The trials were set up in augmented design. Highly significant differences were observed for all the characters studied. Genetic variability parameters showed that phenotypic coefficient of variation (PCV) was higher than the respective genotypic coefficient of variation (GCV) and heritability is high for most of the characters. The characters studied in the present investigation expressed low to high heritability estimates ranging from 37.00 to 99.00 percent for normal soil and 52.00 to 99.00 percent for saline soil. High genetic advance as percent of mean along with high estimate of heritability and GCV are also observed for most of the characters. In normal soil, genetic advance was highest (190.58) for number of filled grains per panicle followed by number of grains per panicle (180.8) and lowest (4.47) for panicle length among yield characters. In case of saline soil, number of grains per panicle recorded highest (171.74) genetic advance followed by number filled grains per panicle (166.77) and the lowest (4.76) for per cent chaffyness. Biological yield, number of grains per panicle and number of filled grains per panicle are important in selection programmes aiming to improve rice yield and the breeder may consider these characters as the main selection criteria.
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