GENETIC VARIABILITY AND CHARACTER ASSOCIATION OF YIELD AND YIELD CONTRIBUTING TRAITS IN BORO RICE (Oryza sativa L.)

Abstract

Twenty three Boro rice genotypes were used in this experiment to evaluate the variability, heritability, genetic advance in percent of mean, correlation of co-efficient and path analysis. The present experiment was laid on randomized complete block design in the experimental field of Sher-e-Bangla Agricultural University, Dhaka- 1207 with three replications. Analysis of variance revealed that; mean sum of square of genotype was recorded highly significant for all the studied characters. PCV were noted greater than the GCV for all the observed traits. The highest value of PCV and GCV were found for number of unfilled grains per tiller 48.90% and 47.72% respectively. High heritability associated with high genetic advance in percent of mean were found for leaf sheath length, number of unfilled grains per tiller, number of primary branches per panicle, panicle length, and thousand seed weight. Through the correlation co-efficient analysis, it was observed that, yield per plant had significant positive association with number of effective tillers (P= 0.535), number of total tiller (G= 0.461), number of filled grain per tiller (G= 0.504, P= 0.379), number of unfilled grains per tiller (G= 0.604, P= 0.365), number of secondary branches per panicle (G= 0.388), and thousand seeds weight (G= 0.821, P= 0.673). Path analysis exhibited that, leaf blade (1.733), stem length (1.338), number of effective tillers, number of unfilled grains per tiller (4.413), number of primary branches per panicle (16.909), number of secondary branches per panicle (0.698), panicle length (16.929) was recorded to show positive and direct effect on yield per plant. From this observation, it was found that G20 (BRRI dhan96) gave early flowering with maximum number of filled grain and maximum yield per plant, G1 (BR1) was found to produce maximum number of effective tillers, G3 (BR5) was found to give highest number of total tillers, and G5 (BR14) exhibited maximum weight for thousand seeds. So, these genotypes of Boro rice could be used for future breeding programs.