HETEROSIS
AND GENETIC VARIABILITY IN INTERGENOTYPIC CROSSES OF OLEIFEROUS BRASSICA
RAPA L.
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
Abstract
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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Return Volume: Journal of
Experimental Biosciences 6(1): January 2015
