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Asian Journal of Plant Sciences

Year: 2021  |  Volume: 20  |  Issue: 2  |  Page No.: 271 - 280

Identification of Resistant Cowpea (Vigna unguiculata (L.) Walp.) Genotypes against Charcoal under Artificial Inoculation

N. Ouédraogo, E.P. Zida, H.M. Ouédraogo, N. Sawadogo, R.W. Soalla, J.B.T. Batieno, A. Ouoba, M. Ouédraogo and M. Sawadogo


Background and Objective: Charcoal rot caused by Macrophomina phaseolina is known to be a serious threat to cowpea in Burkina Faso. Nowadays, control strategies other than host resistance are not much effective and economical. Therefore, the present study aimed to identify among cowpea germplasm, the genotypes endowed with stable resistance to M. phaseolina. Materials and Methods: Eighty cowpea (Vigna unguiculata (L.) Walp.) genotypes including wild, landrace and inbreeding lines were screened for their resistance to Macrophomina phaseolina, the charcoal rot fungus, in greenhouse experiments in Burkina Faso. The test was performed at Kamboinse research station of the Institute of Environment and Agricultural Research (INERA), using two pathogenic strains of M. phaseolina (I2 and I4) selected from a preliminary pathogenicity test involving four isolates. Results: Eight genotypes including 58-57, Bambey-21, CB27, CB46, Gourgou, KN-1, KVx404-8-1 and TVU 14 676 inoculated with the two isolates of M. phaseolina presented high emergence rates (80-100%). After emergence, five genotypes including B05-5a, B27 07a, CB27, SP369 A Profil-39B and SP88 Profil-13A stayed free of disease during the ten-days period of the study, four genotypes including Komsare, Kaya local, 58-57 and Gaoua local-2 showed low severity (S<10%) and 11 other genotypes including KVx 295-2-124-51, Pa local-2, Boalga local, TVU 14 676, Pouytenga-3, Apagbaala, N°91 profil-4, IT82D-849, B301, TV286b profil-12 and IT 98K-317-2 showed moderate disease severity indexes (S<20%) to both isolates of M. phaseolina. Conclusion: The present study gave the opportunity to identify under artificial inoculation, two cowpea genotypes including Kaya local and SP 369A profil-39B, having high and stable resistance to M. phaseolina, among 80 tested genotypes.

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