Inheritance and the Allelic Relationship of Resistance to Cowpea Aphid Borne Mosaic Virus (CABMV) in Two Cowpea Genotypes, KVX640 and KVX396-4-5-2D, in Burkina Faso

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Résumé

Cowpea (Vigna unguiculata (L.) Walp.) is a grain legume crop cultivated in all the
agro-ecological zones of Burkina Faso. It plays an important role in human
nutrition due to its richness in protein and it enormous agronomic, sanitary and
economic potentialities. However, several virus originated diseases negatively
affect it production, the most important being cowpea yellow mosaic transmitted by
aphid or cowpea aphid-borne mosaic virus (CABMV). One of the controle
meseasures of this disease, which causes yeild losses, is the use of resistant
varieties. This study consisted at determining the inheritance and the allelic
relationship of the resistance to CABMV in two cowpea genotypes KVx640 and
KVx396-4-5-2D. Plants were evaluated in pots under green house at Saria research
station in Burkina Faso. The inheritance and allelic relationship studies showed that
the resistance is governed by two dominant genes in the two varieties, each variety
contributing for a resistant gene. Therefore, the resistance is monogenic. There was
not any allelic relationship between the two resistant cowpea varieties, KVx640
and KVx396-4-5-2D, to CABMV. The identification of the nature of the gene
governing the resistance to CABMV was done through a screening of F1
individuals derived from crosses between one resistant parent (KVx396-4-5-2D)
and a susceptible check (Gorom local). The F1 hybrids were uniform; therefore, the
resistance is conferred by a dominant gene

Mots-clés

Cowpea Aphid Borne Mosaic Virus (CABMV), Cowpea Genotypes, KVX640 and KVX396-4-5-2D