Les caféiers en Afrique: diversité génétique et amélioration des plantes
A living collection of many Coffea species has been assembled after several plant collecting missions in the tropical rain forests of Africa. Study of genetic diversity of these species has been carried out using botanical, biochemical markers as well as interspecific hybridization tests, and incompatibility alleles. It has been observed that coffee species are unevenly distributed over the tropical rain forest area. Within species, a genetic structure has been shown which differs from one species to another. Genetic markers were also helpful to trace gene flow between and among wild populations of coffee trees. More generally, we discuss the limitations of gene flow between species, concept of species, and evolution of these species linked with paleoenvironment history. These studies have given practical results for coffee breeding: -Introgression of cultivated forms by wild species may be carried out for transferring useful agronomical traits. -Since it has been found that the C. canephora species is structured in two genetic groups, and the potential of F1 hybrids between the two groups is high, a Reciprocal Recurrent Selection scheme may be used for this species
| Main Authors: | , , , , , |
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| Format: | biblioteca |
| Published: |
1989
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| Subjects: | COFFEA, VARIACION GENETICA, FITOMEJORAMIENTO, GENES, MARCADORES GENETICOS, FLUJO DE GENES, HIBRIDACION INTERESPECIFICA, AFRICA, |
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