Normal view MARC view ISBD view

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

by Montagnon, C; Leroy, T; Charmetant, P; Yapo, A; Legnate, H; Berthaud, J; Charrier, A; Association Scientifique Internationale du Cafe, París (Francia); 19. International Scientific Colloquium on Coffee Trieste (Italia) 14-18 May 2001.
Publisher: Trieste (Italia) ASIC 2001Description: 1 disco compacto.ISBN: 290012189.Subject(s): COFFEA CANEPHORA | CAFE | RENDIMIENTO DE CULTIVOS | RESISTENCIA A LA ENFERMEDAD | VIGOR HIBRIDO | COSTA DE MARFIL | AFRICA | COFFEA CANEPHORA | COFFEE | CROP YIELD | DISEASE RESISTANCE | HETEROSIS | IVORY COAST | AFRICA | COFFEA CANEPHORA | CAFE | RENDEMENT DES CULTURES | RESISTANCE AUX MALADIES | VIGUEUR HYBRIDE | AFRIQUESummary: 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 40Summary: more than clone 461 (one of the best currently distributed clone). Future prospects for the programme are discussed.
    average rating: 0.0 (0 votes)
No physical items for this record

13 ref.

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

more than clone 461 (one of the best currently distributed clone). Future prospects for the programme are discussed.

Click on an image to view it in the image viewer