Upland rice composite population breeding and selection of promising lines for Colombian savannah ecosystem

Châtel Marc, Ospina Yolima, Rodriguez Francisco, Lozano Victor Hugo, Delgado Hermando. 2008. Upland rice composite population breeding and selection of promising lines for Colombian savannah ecosystem. Pesquisa Agropecuária Tropical, 38 (1) : 1-5.

Titre portugais : Melhoramento populacional de arroz de terras altas e seleçao de linhagens promissoras para as condiçoes de savana da Colombia

Résumé : Since 1996, the collaborative project between CIRAD (Agricultural Research Centre for International Development) and CIAT (Centro Internacional de Agricultura Tropical) has gradually phased out intra-specific tropical japonica conventional crossbreeding activities and concentrated on rice genetic base broadening. The development and enhancement by recurrent selection of upland rice composite populations are the new breeding strategies. Using a recessive male-sterile gene (ms). the development of rice population was made easier. In Colombia, upland basic composite populations were enhanced using two recurrent selection-breeding methods: mass recurrent selection and S2 progenies evaluation. At each enhancement cycle, fertile plants are selected for the development of segregating lines and progeny selection using the conventional pedigree method. The most advanced lines are evaluated in yield trials by the project and in collaboration with the Colombian research organization-Corpoica Regional 8, in Villavicencio. Colombia. Promising lines having good adaptation to acid soils were identified. One promising line, extracted from the first cycle of recurrent selection of the composite population PCT-4. shows a higher yield potential with the same earliness of the best commercial check (Línea 30), developed by conventional crossbreeding.

Mots-clés Agrovoc : Oryza sativa, riz pluvial, sélection récurrente, descendance, population composite, lignée

Mots-clés géographiques Agrovoc : Colombie

Classification Agris : F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Châtel Marc, CIRAD-BIOS-UPR Peuplements de riz (COL)
• Ospina Yolima, CIAT (COL)
• Rodriguez Francisco, CIAT (COL)
• Lozano Victor Hugo, CIAT (COL)
• Delgado Hermando, CORPOICA (COL)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/545495/)

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