Association between alleles of the waxy gene and traits of grain quality in Philippine Seed Board rice varieties.

Roferos, L.T.; Juliano, B.O., Philippine Rice Research Inst., Los Baños, College, Laguna; Fitzgerald, M.A., International Rice Research Inst., Los Baños, Laguna . Grain Quality, Nutrition and Postharvest Centre; Butrado, V.M. Jr., University of Queensland, St. Lucia, Queensland, 4072 . School of Land, Crop and Food Sciences

Association between alleles of the waxy gene and traits of grain quality in Philippine Seed Board rice varieties.

2008

Roferos, L.T. | Juliano, B.O., Philippine Rice Research Inst., Los Baños, College, Laguna (Philippines) | Fitzgerald, M.A., International Rice Research Inst., Los Baños, Laguna (Philippines). Grain Quality, Nutrition and Postharvest Centre | Butrado, V.M. Jr., University of Queensland, St. Lucia, Queensland, 4072 (Australia). School of Land, Crop and Food Sciences

The association between alleles of the waxy gene, defined by the number of CT repeats on exon 1, and traits of grain quality was carried out using 47 Philippine Seed Board rice varieties. The major alleles of the waxy gene in the set of 47 were (CT)sub10, (CT)sub11, (CT)sub17 and (CT)sub20. Varieties were divided into four clusters based on the metric of each trait of grain quality. (CT)sub10 (27-32% amylose content (AC)) and (CT)sub11 (22-30% AC) were mainly in clusters 3 and 4 (hard texture), and (CT)sub17 (20-24% AC) and (CT)sub20 (18-27% AC) were exclusively in grain quality cluster 1 (soft texture) and 2 (medium texture). (CT)subn associated negatively with AC in this set. Only six (CT)sub11 and one (CT)sub10 rices were in cluster 4 (high-AC low-GT) and had high RVA consistency (final viscosity-trough viscosity) 200 RVU. (CT)sub17 seemed to be the preferred source of low-intermediate AC in the Philippine rice breeding program, followed by (CT)sub20.

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