GENETIC ANALYSIS OF MORPHOLOGICAL PARAMETERS IN OIL SEED BrassicaGENOTYPES

Abstract

The investigation was started with the selection process of potential populations of Brassica rapa L. The present investigation was carried out under field conditions to evaluate morphologicaltraits of 13 genotypes received from the Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka, considering 13traits, using randomized complete block design with three replications during rabi season from November 2020 to February 2021 in research farm of Sher-eBangla

Agricultural University, Dhaka. The analysis of variance showed significant variation in all the traits. The phenotypic variances were higher than genotypic variances with little differences in all traits. High heritability estimates were observed for days to 50% flowering, days to maturity, number of secondary branches per plant, number of siliquae per plant, length of siliqua, number of seeds per siliqua and yield per plant. Correlation study revealed that seed yield per plant had a highly significant positive correlation with number of secondary branches per plant, length of siliqua, number of siliquae per plant and thousand seed weight at both genotypic and phenotypic level, while days to first flowering, days to 50% flowering and days to 80% maturity showed significant negative correlation with yield at both phenotypic and genotypic level. Path coefficient analysis found that number of secondary branches per plant had the highest positive direct effect followed by plant eight, root length,thousand seed weight and days to 80% maturity had medium level direct effects towards yield, while days to first flowering, days to 50% flowering, shoot length, number of primary branches per plant, number of siliquae per seed, length of siliqua and number of siliquae per plant had negative direct effects.Plant height exhibited lowest (76.15 cm) in G1. The highest number of primary branches per plant (5.80) was recorded in G9. The highest number of secondary branches per plant (6.13) was observed in G6. The highest number of siliquae per plant (155.53) was in G6, the number of seeds per siliqua (24.09) was found highest in G10. The thousand seed weight exhibited the highest (2.82 g) in G10 followed by G6 (2.74 g). The yield per plant was maximum (6.92 g) in G10.Considering the morphological and genetical parameters, the genotypes G1, G6, G9, G10 could be considered as a potential parent for future breeding program.