INHERITANCE OF GRAIN AND FODDER YIELDS AND YIELD COMPONENTS IN COWPEA (Vigna unguiculata (L.) Walp).
INHERITANCE OF GRAIN AND FODDER YIELDS AND YIELD COMPONENTS IN COWPEA (Vigna unguiculata (L.) Walp).
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Date
2012-03
Authors
HASSANE, FODI BALKISSA
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Abstract
Studies were carried out on Two landraces Kanannado Brown and Biu Local (Fodder types)
and IT98K-205-8 (grain type) to estimate the gene effects for grain and fodder yields and
yield components in cowpea, using generation mean analysis. Six generations were
developed (P1, P2, F1, BC1 P1,BC2 P2 and F2) and evaluated at Kadawa. Data collected were
analyzed for: gene segregation, gene action governing the three key parameters (leaf-stem
ratio, total biomass and dual trait) as well as heritability. Significant mean for leaf-stem ratio
in the crosses Kanannado brown × IT93K-205-8 and in the Biu local × IT93K-205-8, and
for dual trait in the cross Biu local × IT93K-205-8. All the backcrosses had significant
better mean performance for all the parameters. This indicated that backcross breeding
procedure may be important in the improvement of yield in cowpea. Different means
obtained showed by the individuals in the population was an indication of the presence of
considerable amount of genetic variability. Transgressive segregation for high and low leafstem
ratio observed in the cross Kanannado brown × IT93K-205-8 suggests that genes were
dispersed among the parents in this study. Polygenic inheritance for the three traits studied
was confirmed by unimodality in the F2 s coupled with the number of effective factors.
Complementary gene effects as evidenced by skewness, epistatic effects were also found.
Duplicate gene was predominantly involved in the inheritance. Correlation had been found
to be high and significant (negative and positive) between dual trait and dry fodder yield;
dry fodder yield and dry seed weight; dual trait and days to first flower, and also between
days to first flower with dry seed yield. Also high heritability was obtained. These showed
the importance of the above traits in selection to improve yield in cowpea.
Description
A THESIS SUBMITTED TO THE SCHOOL OF POST GRADUATE STUDIES
AHMADU BELLO UNIVERSITY, ZARIA
NIGERIA
IN PARTIAL FULFILMENT FOR THE AWARD OF DEGREE OF MASTER
OF SCIENCE IN PLANT BREEDING
DEPARTMENT OF PLANT SCIENCE
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY, ZARIA
NIGERIA
MARCH, 2012
Keywords
INHERITANCE, GRAIN, FODDER YIELDS, YIELD COMPONENTS, COWPEA, Vigna unguiculata