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Written Paper

Grain quality of hybrid rice  [1989]

Khush, G. Kumar, I. Virmani, S.S. (International Rice Research Inst., Los Banos, Laguna (Philippines))

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Grains harvested from commercial F1 rice hybrids represent F2 seed generation and vary in grain characteristics. The effect of parental differences on grain quality of the derived hybrids was studied. Higher head rice recovery was obtained mostly from crosses of parents with good head rice recovery. Physical properties like differences between parents in length, breadth, shape, and weight of grain do not pose problems because seeds borne on hybrid plants do not vary from each other. Rather hybrids with desired physical properties of grain can be produced by selecting the parents of desired grain size. Crosses among parents of different endosperm appearance, on the other hand, produced grains with different types of endosperms in the bulk sample from the hybrid plants. Such variation in grain appearance would affect market acceptability. The use of a waxy or dull endosperm parent with a translucent parent should be avoided. When parents differed widely in amylose content, the F2 single grains were clearly classifiable into two, three, or four categories. However, segregation for amylose content did not hurt cooking and eating quality of hybrid grains. Similarly, different classes for gelatinization temperature in low/intermediate, low/low, or intermediate/intermediate crosses did not produce detectable differences in cooked rice samples. With appropriate selection of parents, the hybrids with desired tenderness, cohesiveness, and aroma can be produced to me
et consumer preference