Amelioration du cafeier liee aux progres genetiques
The improvement for a plant species generally needs to alter its genetic structure. Therefore it is not without interest to try and understand the natural course of evolution which induced genome morphogenesis as well as differenciation of genetic effects and fixation of reproductive system. In the first part of the paper the modalities of the evolution of genetic information and their resulting diploid, autopolyploid, allopolyploid structures are discussed. This set determines the adaptive strategy of a species in connection with the breeding system and genetic actions. In a second part the populations related to these genetic structures as well as the mechanisms for their isolation and ecotypic diversification are analysed. The third part presents the potentialities of genetic advance, on the one hand in relation with the results of tetraploid genetics, on the other hand in account with the mechanisms of autogamy and allogamy. Experiments achieved in other kinds of interspecifichybridizations which have good analogy with this situation (wheat x rye, diploid Medicago x Lucerne, ray-grass x fescue), will be taken as reference. A critical analysis of various patterns of meiotic pairing will be able to reinforce some hypothesis. This set allows to discuss advantages and drawbacks for various ways of improvement. It will be deduced the remaining points which have to be cleared up and the objectives of first importance
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| Formato: | biblioteca |
| Publicado: |
París (Francia)
1976
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| Materias: | COFFEA, HIBRIDACION, MANIPULACION DE CROMOSOMAS, POLIPLOIDIA, ADAPTACION FISIOLOGICA, MEDIO AMBIENTE, INTERACCION GENOTIPO AMBIENTE, HIBRIDACION INTERESPECIFICA, |
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