Abstract
Thirty jhum rice genotypes of hilly origin were studied for genetic variability, correlation and path analysis under medium high land of Bangladesh Rice Research Institute, Gazipur, Bangladesh. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications for the period of March to July (Aus season), 2016. Analysis of variance revealed significant difference among the genotypes for all the characters studied. The PCV values were greater than GCV, revealing little influence of environment in character expression. High values of heritability along with high genetic advance were observed for filled grain and plant height. Such outcomes suggested predominance of additive gene action in gene expression for these characters. Grain yield showed positive association with number of effective tiller and thousand grain weight at genotypic in conjunction with phenotypic level. Most of the traits had significant genetic variability besides, plant height and panicle length exhibited positive direct effect together with positive correlation with yield. Thousand grain weight possessed negative direct effect but highest positive significant correlation with yield.SAARC J. Agri., 16(1): 193-203 (2018)
Highlights
Rice is a food grain crop of global importance with special preference in Asian countries (Sahu et al, 2017)
Rice is a unique kind of plant genetic resource which is cultivated through hilly areas mostly by tribal people of Bangladesh
A critical analysis of the genetic variability parameters, namely, Genotypic Coefficient of Variability (GCV), Phenotypic Coefficient of Variability (PCV), heritability and genetic advance for different traits of economic importance is a major pre-requisite for any plant breeder to work with crop improvement pogrammes
Summary
Rice is a food grain crop of global importance with special preference in Asian countries (Sahu et al, 2017). More than 300 local jhum rice landraces have been collected from various hilly districts of Bangladesh and conserved in Bangladesh Rice Research Institute (BRRI) genebank (Source: BRRI genebank accession book). This collection is an invaluable genetic resource that can be used for varietal development. A critical analysis of the genetic variability parameters, namely, Genotypic Coefficient of Variability (GCV), Phenotypic Coefficient of Variability (PCV), heritability and genetic advance for different traits of economic importance is a major pre-requisite for any plant breeder to work with crop improvement pogrammes. Comprehending the above facts, the present investigation was undertaken to know variability and correlation among yield and its contributing characters using 30 jhum rice genotypes under direct seeded condition in a medium high land
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