GENETIC STUDIES OF GRAIN YIELD AND OTHER AGRONOMIC TRAITS OF COWPEA (VIGNA UNGUICULATA) (L.) Walp) IN WATER STRESS AND NON-STRESS CONDITIONS
GENETIC STUDIES OF GRAIN YIELD AND OTHER AGRONOMIC TRAITS OF COWPEA (VIGNA UNGUICULATA) (L.) Walp) IN WATER STRESS AND NON-STRESS CONDITIONS
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Date
2019-11
Authors
ABUBAKAR, Hashim
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Abstract
The study on the genetic studies for grain yield and other agronomic traits under
water non-stressed and water stressed conditions in cowpea was carried out using five
parental lines comprising three drought resistant (IT98K-628, IT99K-7-21-2-2,
SAMPEA-10) and two drought susceptible genotypes (SAMPEA-8, BIU LOCAL)
which were crossed to develop F1s. The F1s were advanced to F2s and backcrosses
made to the two (2) parents. The eighteen generations obtained were evaluated along
with a commercial check Dan’ila in Randomized Complete Block Design (RCBD)
with replications at the Institute for Agricultural Research (IAR), Samaru, Zaria.
Significant differences in mean performance among the parents and the F1s suggests
sufficient variability across the generations for the characters studied. The three
parameter model was adequate to explain variations observed in the inheritance of
days to fifty percent flowering, plant height, number of seeds per plant and root
length. It was however inadequate to explain the variations observed in the
inheritance of days to pod maturity, pod yield per plant and hundred seed weight. For
these the six parameter model of Jinks and Jones was fitted. Non-allelic gene
interactions were significant for number of matured pod per plant and pod yield per
plant under the two different conditions. High broad sense heritability was obtained
(95%). These showed the importance of the above traits in selection. Correlation had
been found to be high and significant (positive and negative). The genotypic
correlation coefficients exceeded those of the corresponding phenotypic correlation
coefficient for most of the character pairs indicating that the correlation were more
genetic than environmental in the three sets of cowpea crosses studied, indicating;
positive response, repeatable and transmit ability of these traits in selection.
Description
A DISSERTATION SUBMITTED TO THE SCHOOL OF POSTGRADUATE
STUDIES AHMADU BELLO UNIVERSITY IN PARTIAL FULFILLMENT
OF THE REQUIREMENTS FOR THE AWARD OF A MASTER DEGREE IN
PLANT BREEDING
DEPARTMENT OF PLANT SCIENCE,
FACULTY OF AGRICULTURE,
AHMADU BELLO UNIVERSITY,
ZARIA, NIGERIA
Keywords
GENETIC STUDIES,, GRAIN YIELD,, AGRONOMIC TRAITS,, COWPEA,, (VIGNA UNGUICULATA) (L.) Walp),, WATER STRESS,, NON-STRESS CONDITIONS.