Genetic Analysis for Yield and Yield Components in Rapeseed

Year 2017, Volume: 4 Issue: 4, 376 - 384, 26.10.2017

Hafsa Naheed Raziuddin FARHATULLAH Quahir Sohaıl Nadia Khan

Abstract

Information on estimates of
combining ability and heritability of the promising lines of breeding material
is important for evolving higher yielding varieties of rapeseed (Brassica napus L.). To estimate the combining ability and heritability of F₂ populations
of 4 x 4 full diallel crosses and parents, an experiment was carried out at The
University of Agriculture, Peshawar, in growing season 2012-2013. Four parental
lines and F₂ populations of six direct and six reciprocal crosses
were planted in the experiment using randomized complete block design. Data
were recorded on yield and yield components. Analysis of variance revealed
significant variation among genotypes for all the parameters studied. Yield plant^-1 ranged from 4.27 to 9.17 g,
pods main- raceme^-1 ranged from 42 to 89 and seeds pod^-1ranged
from 8 to 18. Among parents highest yield
plant^-1 and seeds pod^-1were observed for AUP-402. Cross
AUP-402 x AUP-401 produced the highest seed yield plant^-1 and more
pods plant^-1. The results of combining ability analysis showed that
general combining ability was significant at p ≤ 0.01 for pods main-raceme^-1and
seeds pod^-1. SCA and reciprocal effects were significant at p ≤ 0.01
for pods main-raceme^-1, seeds pod^-1 and seed yield.
Genotype AUP-401 was best general combiner for several parameters. Crosses
AUP-403 x AUP-404 and AUP-401 x AUP-402 were best specific combiners for seed
yield plant^-1. Heritability _(bs) estimates were high (>70%) for seeds pod^-1.
Moderate heritability values were observed for seed weight and seed yield plant^-1.
The variance components of specific combining
ability (SCA) were greater than respective general combining ability (GCA)
components of all the characters signifying the presence of non-additive
genetic effects in transfer of these traits and for that reason
selection in the later generations should be practiced for improvement of these
traits.

Keywords

Combining ability , rapeseed , heritability

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