GENETIC ANALYSIS OF ECONOMIC TRAITS IN PIGEONPEA [Cajanus cajan (L.) Millsp.]
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Date
2014-07-10
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University of Agricultural Sciences, Bengaluru
Abstract
An investigation was conducted in pigeonpea during 2012 and 2013 at
UAS, GKVK, Bangalore to explore restorers/maintainers for A2 and A4
cytoplasm-based CMS lines; to identify CMS lines and restorers with desirable
gca and hybrids with desirable sca and heterosis; to assess the effects of male
sterility inducing cytoplasm on yield and its components; to compare the
performance of single cross hybrids (SCH) and double cross hybrids (DCH)
and, to predict and validate DCH performance; and to study the relationship of
parental diversity with hybrids sca and mid-parent heterosis.
Sixteen out of 78 genotypes tested, restored the fertility of A2 cytoplasmbased
CMS lines, BRG 1A and Hy 3CA while three out of 36 genotypes, restored
the fertility of A4 cytoplasm-based CMS lines, BRG 1A, BRG 3A and Hy 3CA. Of
the three A2 cytoplasm-based CMS lines and three restorers, the CMS line Hy
3CA and restorer GRG 206 recorded good gca for seed yield. Out of nine A × R
hybrids, Hy 3CA × GRG 206, BRG 1A × GCB 15 and BRG 1A × GRG 206 were
heterotic for yield. Male sterility inducing cytoplasm significantly influenced
hybrids mean performance and mid-parent heterosis for length of inflorescence
and 100 seed weight, while it did not have significant effect on the sca effects
for any of the characters. The genotypes BRG 10-2 and BRG 11-1 were good
general combiners for most of traits including yield. Among 28 SCH, CoRG
9701 × RKVT 261 and BRG 10-2 × CoRG 9701 were best specific combinations
for pods per plant and seed yield. There was good agreement between realized
and predicted performances of DCH for all the characters except seed yield. The
relationship of parental divergence with hybrid sca effects and mid-parent
heterosis was poor enough to have any predictive power of parental divergence.
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