GENETIC AND PHYSIOLOGICAL STUDIES FOR SEED YIELD AND YIELD ATTRIBUTING TRAITS IN COWPEA [Vigna unguiculata (L.) Walp.]
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Date
2016-10-23
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Investigation was carried out in cowpea at Dry Land Agriculture Project, GKVK,
UAS, Bangalore during 2008-2010 to study the variability and five generation mean
analysis for days to first flowering, days to maturity, plant height, primary branches and
secondary branches per plant, pods per plant, pod length, seeds per pod, seed yield per
plant and test weight in three crosses of cowpea viz., IT-38956-1 × KBC-2, IT-38956-1 ×
CP-12 and KBC-2 × CP-12. In addition, the genetic variability parameters and character
association studies for the two physiological traits viz., specific leaf area and spad
chlorophyll meter reading were studied in the F3 for the cross IT-38956-1 × KBC-2. The
mean and variance in three F2 populations of ten quantitative characters indicated wide
variability for plant height, days to maturity, pod length, seeds per pod and seed yield per
plant. Moderate to high GCV, PCV, genetic advance and heritability were observed for
plant height, secondary branches per plant, pods per plant, seeds per pod and seed yield
per plant in all three crosses. Significant and high positive correlation for seed yield per
plant with secondary branches per plant, pods per plant, pod length and seeds per pod
were observed in all three crosses. Five generation analysis in three crosses indicated
non-additive gene action. Minimum number of effective factors ranged from one to five
pairs. Potence ratio indicated the presence of over-dominance and partial dominance in
maximum traits. SLA and SCMR has showed week association with the seed yield.
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