Pedigree analysis of Philippine-bred rice cultivars, 1960 to 1994
1995
de Leon, J.C. | Carpena, A.L. | Hernandez, J.E. | Robles, R.P. (Philippine Rice Research Inst., Maligaya, Munoz, Nueva Ecija (Philippines). Plant Breeding and Biotechnology Div.)
From 1960 to 1994, 67 varieties of rice (Oryza sativa) were released in the Philippines for irrigated lowland (IL), rainfed lowland (RL), and upland (UL) cultivation. Pedigree-based coancestry analyses showed that the genetic constitution of these varieties accumulated the basic genes for desirable traits and general adaptation, rice breeders resorted to a genetic core of 19 ancestral parents from the 57 initial landraces. The earlier varieties such as IR8, IR20, IR22, IR24, IR36, BPI-76, and other elite lines were also widely used as parental materials to expedite the breeding process. Overall, germplasm contributors grew in number as cross-breeding progressed at the International Rice Research Institute (IRRI), Los Banos, Laguna (Philippines), Bureau of Plant Industry (BPI), Manila (Philippines), Philippine Rice Research Institute (PhilRice), Munoz, Nueva Ecija, (Philippines), and Univeristy of the Philippines Los Banos (UPLB), College, Laguna (Philippines)
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