The inheritance patterns of the contrasting petal colour, purple and white; pod colour,
purple and straw-white; and shoot colour, purple and green were studied. Analysis of the
F2 and backcross populations showed that petal colour is governed by one allelic pair WW,
while pod and shoot colours appear to be determined pleiotropically by two allelic pairs,
PrPr and GrGr, interacting in as recessive suppressors. The PrPr gene seems to be a set of
localized alleles that determine the different purplecolourintensities on pods. Deep purple
pods are produced by the genotype PrPr; light purple by Prpr; and straw-white pods by
prpr. Because prpr is capable of suppressing G,... (recessive suppressor) the genotypes prpr
Gr- produced normal green shoots or with very mild streaks of anthocyanin and strawwhite pods.
The genotypes Pr- Gr-, Pr-grgr and prprgrgrproduced pigmented shoots and
Keywords: Colour, inheritance, cowpea, Vigna unguiculata.
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
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