Hybrids Pre-zygotic barriers in hybrids between forms wild cowpea, Vigna unguilata (l.) walp

Publication Type

Journal Article

Journal Name

Biotechnology, Agronomy and Society and Environment

Publication Date

1-1-2006

Abstract

Hybrids pre-zygotic barriers between wild forms of cowpea. The wild forms of cowpea, Vigna unguiculata, constitute an important gene pool insufficiently exploited for the improvement of the cultivated form. In order to promote the use of these wild forms in the genetic improvement programmes, we undertook to understand the various incompatibility reactions which appear in the crosses between wild forms. Efforts were concentrated to understand the incompatibility barriers in the hybridizations between subsp. baoulensis NI 933 and the other wild forms of V. unguiculata. Thanks to the use of the aniline blue fluorescence, we observed a high frequency of pre-zygotic barriers. They appear in three sites, i.e. the higher and lower third of the style, and within the ovary. However, these incompatibility barriers are not absolute. Indeed, in our hybridizations, more than 4% of the ovules were fertilized in the various studied combinations.

Keywords

Barriers of pre-zygotic incompatibility, Intraspecific hybridization, Pollen germination, Pollen tube growth, Vigna unguiculata, Wild forms

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