VARIABILITY AND INTERRELATIONSHIPS OF YIELD AND YIELD CONTRIBUTING TRAITS IN F5 POPULATION OF BORO RICE (Oryza sativa L.)

Abstract

The experiment was conducted with 29 genotypes of rice at the experimental farm of Sher-e-Bangla Agricultural University, Dhaka during the period of December, 2013 to May, 2014 to estimate the variability and interrelationship between yield and yield contributing characters and their direct and indirect effect on yield. The experiment was laid out in Randomized Complete Block Design with three replications. All the genotypes varied significantly from each other for all the studied characters which indicate the presence of considerable variations among the genotypes. The PCV values were higher than the respective GCV values for all the characters under study. Plant height, total spikelet per panicle, number of filled grains per panicle and number of unfilled grains per panicle showed high genotypic and phenotypic coefficient of variation. These characters also showed high heritability coupled with high genetic advance and very high genetic advance in percentage of mean which is normally more helpful in predicting the genetic gain under selection. Correlation co-efficient analysis revealed that yield per hectare had significant positive association with panicle length, number of secondary branches per panicle, total number of spikelet per panicle, number of filled grains per panicle and yield per plant. Path coefficient analysis revealed that number of filled grains per panicle showed the highest positive direct effect on yield per hectare followed by panicle length, number of secondary branches per panicle and yield per plant. Considering variability, heritability, genetic advance, correlation co-efficient and path analysis, number of filled grain per panicle showed high heritability, genetic advance, high significant positive correlation and the highest positive direct effect on yield per hectare.