Improving irrigated rice populations for the temperate climate in Chile

Hernaiz Santiago Ignacio, Alvarado José Roberto, Châtel Marc, Castillo Dalma, Ospina Yolima. 2005. Improving irrigated rice populations for the temperate climate in Chile. In : Population improvement: A way of exploiting the rice genetic resources of Latin America. Guimaraes Elcio Perpetuo (ed.). FAO, EMBRAPA, CIRAD-CA. Rome : FAO, 129-143.

Résumé : Current varieties in Chile have reached their maximum productivity possible under field conditions. Hence, to increase yield potential, the national rice programme decided to incorporate population improvement by recurrent selection. During the 1996/97 cropping season, a site-specific population (PQUI-1) was developed from a gene pool introduced from CIRAD (GPIRAT-10). In the 2000/01 season, a second site-specific population (PQUI-2) was obtained, using PQUI-1\CH\3\1 as base population. The first recombination was done at CIAT, Colombia. The Chilean population PQUI-1 was improved, using two methods: the first was based on selecting malesterile plants in two ecosystems: Chillan at 36° 34'S and 72° 02'W, and Colchagua at 34° 33'S and 71° 24'W The second method was based on selecting fertile plants tested, under controlled laboratory conditions, for cold tolerance at germination. Taking into account the wide variability shown by the populations, fertile plants were selected and their progeny evaluated in line nurseries. Evaluation of the first fixed lines obtained showed yields were 6% to 9% higher than those of the commercial variety Diamante-INIA.

Mots-clés Agrovoc : Oryza, population composite, sélection récurrente, zone tempérée

Mots-clés géographiques Agrovoc : Chili

Classification Agris : F30 - Génétique et amélioration des plantes

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

Auteurs et affiliations

• Hernaiz Santiago Ignacio, INIA (CHL)
• Alvarado José Roberto, INIA (CHL)
• Châtel Marc, CIRAD-CA-UPR Peuplements de riz (COL)
• Castillo Dalma, INIA (CHL)
• Ospina Yolima, CIAT (COL)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/527242/)

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