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A partial male sterile mutant in cowpea Singh, B.B. & Adu-Dapaah, H.K. Abstract A partial sterile line of cowpea (Vigna unguiculata (L.) Walp.) resulting from spontaneous mutation was characterised. Plants were classified based on plant morphology, pollen viability and pod set. Partial sterile plants remained green past usual maturity and had thick leathery leaves with a few fleshy 1-3 seeded pods. Reciprocal crosses indicated partial female fertility. Pollen number per anther was variable and about 77% pollen from mutant plants were normally stained with acetocarmine compared with 98.3% for normal plants. The proportion of fertile to partial sterile plants in segregating populations indicated that the character is controlled by a single recessive gene which is being designated as "ps". The homozygous recessive plants bred true for partial sterility. The possible uses of this mutant are discussed. The line is being maintained as IT85D-3626. Keywords Mutation, partial sterility, segregation, Vigna unguiculata

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Singh, B.B. & Adu-Dapaah, H.K. Résumé Une lignee partielle sterile de niebe (Vigna unquiculata (1) Walp). provenant d'une mutation spontanee a ete etudiee. Les plantes ont ete classes en tenant compte de la morphologie de la plante, de la viabilite du pollen et de la formation des gousses. Les plantes partiellement steriles etaient restees vertes apres la maturite habituelle et disposaient des feuilles coriaces et epaisses avec peu de gousses charnues a 1-3 graines. Les croisements reciproques indiquaient une fertilite femelle partielle. Le nombre de pollen par anthere etait variable et environ 77% de pollen provenant de plantes mutantes etaient normalement tachetes par l'acetocarmine par rapport aux 98,3% des plantes normales. La proportion des plantes fertiles par rapport aux plantes steriles dans la separation des populations a montre que le caractere est controle par un seul gene recessif appele "ps". Les plantes a genes recessifs homozygotes ont manifeste une vraie reproduction pour une sterilite partielle. Les eventuels usages de ce mutant sont discutes. La lignee est maintenue comme IT85D-3626. Mots Clés Mutation, sterilite partielle, segregation, Vigna unquiculata

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