Outcome of two decades of reciprocal recurrent selection applied to C. canephora in Cote d'Ivoire: new outstanding hybrids available for growers

Since the beginning of the 80's, a reciprocal recurrent selection programme has been applied to C. canephora in Cote d'Ivoire, Africa, under the collaboration between the Centre National de Recherche de Cote d'Ivoire (CNRA) and the Centre International de Recherche Agronomique pour le Developpement (CIRAD). The study of C. canephora genetic diversity lies at root of this programme. Work by the ORSTOM (now the Institut de Recherche pour le Developpement-IRD) revealed the existence of two genetic pools: the Guinean pool and the Congolese pool. The structure of that diversity was then specified and four groups were identified within the Congolese pool. Hybrid vigour, or heterosis, was then observed in progenies between Guinean and Congolese parents: this hybrid vigour is exploited through reciprocal recurrent selection (RRS). The genetic groups were characterized and assessed prior to defining basic populations for RRS. Between-pool tests were then carried out using two or three testors from the reciprocal population (indirect RRS on testers). An overview of the first selection cycle is now possible. Concerning the Guinean pool, genetic gains on test value reached +38 percent for yield, +3 percent on rust resistance and +7 percent on bean size. Concerning the Congolese pool, SG1 proved to be superior to all other groups for yield test values but less resistant to rust. There was no significant difference between Congolese groups for bean size. The major outcome of these two decades and of the first cycle of RRS is the identification of 10 between-pool hybrids (BPH), disseminated in seed forms, producing as much or even more than current clones, distributed as cuttings. The best BPH showed a potential yield of 3.5 tonnes of green coffee per hectare and per year, which is 40

Bibliographic Details

Main Authors:	95332 Montagnon, C., 86193 Leroy, T., 56621 Charmetant, P., 132447 Yapo, A., 85827 Legnate, H., Berthaud, Julien, autor 48601, 56635 Charrier, A., 3180 Association Scientifique Internationale du Cafe, París (Francia), 19. International Scientific Colloquium on Coffee Trieste (Italia) 14-18 May 2001
Format:	biblioteca
Published:	Trieste (Italia) ASIC 2001
Subjects:	COFFEA CANEPHORA, CAFE, RENDIMIENTO DE CULTIVOS, RESISTENCIA A LA ENFERMEDAD, VIGOR HIBRIDO, COSTA DE MARFIL, AFRICA,
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