Guimaraes Elcio Perpetuo, Châtel Marc.
2005. Exploiting rice genetic resources through population improvement.
In : Population improvement: A way of exploiting the rice genetic resources of Latin America. Guimaraes Elcio Perpetuo (ed.). FAO, EMBRAPA, CIRAD-CA
Résumé : With the crop rice (Oryza sativa L.), breeders probably have the widest range of choices for exploiting the genetic resources available in the genus. They have access not only to the crop's genetic resources as found in different ecosystems, but also to the knowledge base of its classification among genetic groups. Hence, breeders can also use the African Oryza glaberrima Steud. and various wild species. Such broad inter- and intra-species variability is used in conventional breeding methods for self-pollinating crops, with the additional possibilities of producing hybrids and improving broad genetic base populations. This chapter presents a general view of how Latin American breeders seek to exploit rice genetic resources to develop varieties, emphasizing population improvement. The search for genes for resistance to diseases and pests, a new ideal plant type and hybrids is discussed as a strategy to increase grain yield and use genetic resources more effectively. We briefly describe the achievements of various countries using population improvement, already presented in detail in several chapters of this volume. We highlight the commercial release in Brazil of cultivar SCSBRS 113 - Tio Taka, the first irrigated rice variety to be obtained from a line derived from a broad genetic base population improved through recurrent selection. We conclude by recommending modifications to the evaluation methodology for population improvement, particularly for the trait grain yield.
Mots-clés Agrovoc : Oryza sativa, population composite, sélection récurrente, amélioration des plantes
Mots-clés géographiques Agrovoc : Amérique latine
Classification Agris : F30 - Génétique et amélioration des plantes
Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique
Auteurs et affiliations
- Guimaraes Elcio Perpetuo, EMBRAPA (BRA)
- Châtel Marc, CIRAD-CA-UPR Peuplements de riz (COL)
Autres liens de la publication
Source : Cirad - Agritrop (https://agritrop.cirad.fr/527234/)
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