Search for the grain quality of raw and cooked IR64 milled rice among Philippine Seed Board varieties
2006
Roferos, L.T., Philippine Rice Research Inst., College,Los Banos, Laguna (Philippines) | Felix, A.dR. | Juliano, B.O.
Despite the introduction of many PSB Rc varieties with similar intermediate apparent amylose content (AC) and intermediate starch gelatinization temperature (GT), IR64 continued to be the variety of choice among traders and processors. The grain quality of aged milled rice of PSB/NSIC Rc and selected IR varieties grown during the 2002 dry season was compared to characterize and subject the values to cluster analysis. Three clusters plus IR29 were obtained based on physical properties alone, and four clusters were obtained based on both physical and eating properties. IR64 was shown to belong to cluster 1 based on physical and eating qualities together with PSB Rc18, PSB Rc14, PSB Rc42, PSB Rc64, PSB Rc72H and Sinandomeng. Consumer evaluation of selected PSB Rc rices and IR64 from the clusters showed that in raw form, intermediate -AC intermedia -GT PSB Rc18, PSB Rc72 H F2, PSB Rc 14 and low -GT PSB Rc12 had higher to comparable consumer scores than IR64. Low -AC NSIC Rc104 with short, bold grain had the lowest score for raw rice. Although IR64 had better scores for cooked rice than high -AC rices in clusters 2 and 4, PSB Rc72H F2 and PSB Rc42 cooked rice had higher consumer rank score and consumer rating than IR64, PSB Rc18, PSB Rc14 and PSB Rc64 all in cluster 1 had comparable cooked-rice scores to IR64. Low-GT PSB Rc12 had lower ranked score for cooked rice than other intermediate-Ac rices with intermediate GT. Consumer rating should be evaluated further as a promising replacement for consumer preference rank score of rice samples. Among japonica (PJ) type rices, intermediate GT among waxy and low-AC entries had harder staled cooked rice than low-GT entries, but among intermediate AC entries,even the fresh cooked rice of low-GT entries tended to be harder than intermediate-GT entries, just as in PSB Rc14 and PSB Rc12.
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