INHERITANCE OF PROTEIN IN COWPEA (VIGNA UNGUICULATA (L.) WALP) AND ITS CORRELATION WITH YIELD AND YIELD COMPONENTS
INHERITANCE OF PROTEIN IN COWPEA (VIGNA UNGUICULATA (L.) WALP) AND ITS CORRELATION WITH YIELD AND YIELD COMPONENTS
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Date
1990-04
Authors
SULEIMAN, DANGANA ABDUL
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Abstract
Three cowpea (vigna unguiculata (L. ) walp) lines were
selected based on their per cent crude protein and used as
parents in crosses in the following combinations: 2/180—4—12
(High) x 11/48-2 (Low); 2/180-4-12 (High) x L—25 (Low) and
11/48-2 (Low) x L—25 (Low). In the first cross the -following
generations were obtained in addition to the parentals,
reciprocal F1's, reciprocal backcrosses and F2. In the
remaining two crosses only the reciprocal F1's and F2
populations were obtained in addition to the parentals,
The F1 means per cent crude protein content were
either closer to or lower than the low protein parent, thus
indicating partial dominance to overdominance of low protein
over high, No significant difference was observed between
reciprocal F1's, indicating the absence of maternal
effects. The F2 distributions for per cent protein were
normal suggesting the involvement of multiple genes, thus
supporting the estimates of three major genes with possible
modifiers.
Broadsense heritabiiity estimates ranged from 40.7% in
the cross low x low to 73.4% in the crosses high x low.
Narrowsense heritabiiity estimates ranged from 26.8% to
40.3%. These estimates indicate considerable? genetic
influence some of which were additive,
In all crosses, negative phenotypic and genotypic
correlations predominated for yield, number of seeds/pod and
number of days to flowering with per cent protein, Significant
negative phenotypic correlations were obtained between
number of pods/plant and per cent protein, while 100—seed
weight showed mostly positive phenotypic and genotypic
correlations with per cent protein. Positive correlations
predominated between days to maturity and per cent protein.
Some high yielding segregant had high protein percentage,
suggesting that high yield and high protein percentage can be
combined into a suitable genotype most especially with the
weak negative correlation between these characters
Description
A thesis submitted to the Postgraduate School,
Ahmadu Bella University, in partial fulfilment
of the requirements for the degree of
Master of Science in Crop Breeding.
Department of Plant Science
Faculty of Agriculture
Ahmadu Bello University,
Zaria, Nigeria.
April 1990
Keywords
INHERITANCE,, VIGNA,, UNGUICULATA,, WALP,, CORRELATION,, YIELD COMPONENTS