Diversity assessment of Philippine traditional purple rice (Oryza sativa L.)
2002
Sinohin, V.G.O. (Philippines Univ. Los Banos, College, Laguna (Philippines). Inst. of Plant Breeding) Borromeo, T.H.
Traditional purple rice collected from four provinces of the Philippines and from Malaysia have important characteristics that may be useful for the improvement of other rice varieties. The purple rice varieties were studied to determine the variation among their visual plant characters, chemical traits and their resistance to different pest and diseases. On the basis of measurable characteristics such as plant height, the different rice collections were delineated into three major group clusters. All collections from Abra province clustered together in one group. Two major group clusters were formed when the collections were analyzed based on qualitative data. The collections from Abra stood out because of their seeds' distinct awned (or bearded) character. Awn is the slender extension from the rice hull. Seven of the purple rice collections from Palawan, Bohol, Surigao del Sur and Malaysia were observed to be resistant to rice blast disease. Furthermore, several accessions were found to have twice the protein content of modern varieties. Despite the little variation observed among the collections based on visual plant characters, characterization at the molecular level using vastly more sensitive genetic markers showed differences among the purple rices collected. Collections from different locations showed high diversity while those from the same location were similar. The genetic variation uncovered by this study, for example, the high protein content in some purple rice collections, could provide important traits for the improvement of other rice varieties
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