6-1-11-Siddikee et al


M. A. Siddikee*, M. I. Zereen, M. A. Rahim, K. M. K. Huda, M. A. Z. Chowdhury and M. S. R. Bhuiyan
*Corresponding author; E-mail: asad_sau06@yahoo.com


An attempt was made to assess the magnitude of heterosis with a view to know performance of hybrids and desirable heterosis among twelve crosses of oleiferous Brassica. Most of the crosses exhibiting desirable significant heterobeltiosis as well as heterosis over mid parent on different characters. On the basis of desirable heterotic values the hybrids were scored for individual characters. On the basis of average score and rank position the hybrid SS 75 x Tori 7 was superior for number of primary branches per plant, number of siliquae per plant and seed yield per plant; BARIsar-6 x BARIsar-9, SS 75 x BARIsar-9 for seeds per siliqua; SAU YC x Tori 7 for number of secondary branches per plant; BARIsar-6 x BARIsar-9 for length of siliqua, SS 75 x Tori 7, BARIsar-6 x BARIsar-9 for thousand seed weight and BARIsar-9 x SAU YC were superior for percent (%) oil content. Hybrid of Tori 7 x SS 75 showed desirable negative heterosis for the characters days to first flowering, 50% flowering and maturity. Variations among the genotypes were studied and mean squares for all the characters were highly significant. The difference between genotypic and phenotypic variances was relatively high for number of siliquae per plant, plant height and number of seeds per siliqua indicating large environmental influence among the characters. The values of PCV and GCV indicated that there were considerable variations for all the traits except days to maturity and length of siliqua. Heritability and genetic advance were high for almost all the characters indicating superior performance of the genotypes were due to genetical reasons.

Keywords: Oleiferous Brassica rapa, Heterosis, Hybrid, Variability.

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