PQUI-1 rice population developed with cold tolerance by recurrent selection

Santiago Hernaiz L.1, Roberto Alvarado A., Marc Chatel y Jaime Borrero

Rice genetic stock (Oryza sativa L.) GPIRAT-10 made up of japanese type varieties and strains was crossed with Chilean material to introduce greater cold tolerance. As a result, a new population for recurrent selection named PQUI-1 was obtained. This new population was composed of GPIRAT-10 (50%) and the Chilean genotypes Diamante-INIA (10.3%), Buli -INIA (13.3%), Quila 67108 (16.22%), CINIA 609 (5.09%) and CINIA 606 (5.09%). The population PQUI-1 ripens earlier and has greater cold resistance. During the first recombination cycle, the population PQUI-1 was sowed in two different ecosystems (Chillán and Colchagua), and a selection of plants was made based on environmental and agricultural characteristics, finally obtaining two new populations named PQUI-1CO1 and PQUI-1 CH1.

Keywords: Recurrent population, cold tolerance, rice breeding, Oryza sativa
1 Instituto de Investigaciones Agropecuarias, Centro Regional de Investigación Quilamapu, Casilla 426, Chillán, Chile. E-mail: shernaiz@inia.cl.