INHERITANCE PATTERN OF SEED COAT TEXTURE IN COWPEA (VIGNA UNGUICULATA (L.) WALP.

Authors

  • A.S. OLADEJO
  • A.O. BOLAJI
  • O.A. OLAWUYI

Keywords:

cowpea, Mendelian ratio, seed coat texture, segregation.

Abstract

Seed coat texture in cowpea has been reported to be heritable but with conflicting mode of inheritance. Hence, understanding the mode of inheritance for this trait is important to developing acceptable cowpea varieties for Nigerias consumers. The objectives of this study were to determine the mode of inheritance of seed coat texture and determine the pattern of dominance of seed coat texture in cowpea. Four generations of cowpea, P1, P2, F1, and F2 were derived from each of two bi-parental crosses of TVu 4669 x Vita 7 and Ife Brown x TVu 2723, each pair of parents having contrasting characteristics for seed coat textures (i.e. rough and smooth). Different generations were evaluated in an experiment laid out in a randomized complete block design with three replicates for the parents, (P1 and P2), F1 population and four replicates for the F2 population at the spacing of 60cm x 30cm. Data on seed coat texture collected from the crosses by visual observation were subjected to Test of Goodness-of-Fit. The F2 plants for the two different crosses yielded 72 smooth seed coat and 23 rough seed coat texture and 66 smooth and 20 rough seed coat textures respectively closely fitted a 3 smooth: 1 rough ratio. Statistically, chi-square - ? 2 = 0.032 at (P?0.05) confirmed there was no significant difference between the observed and expected values as the calculated. This indicates that seed coat texture is controlled by a pair of single genes and under a monogenic inheritance. Smooth seed coat texture was also observed to be dominant over rough seed coat texture in all the crosses.

Published

2020-08-04