RICE MUTANT WITH HIGH CONTENT OF INDIGESTIBLE STARCH, RICE FLOUR, INDIGESTIBLE STARCH, RICE GEL, FOOD, AND TEXTURE IMPROVER, AS WELL AS PRODUCTION METHOD OF RICE MUTANT WITH HIGH CONTENT OF INDIGESTIBLE STARCH

摘要

To provide a rice mutant with a high content of indigestible starch without using genetic recombination techniques.SOLUTION: A non-genetically modified rice mutant in which the locus of rice branching enzyme type IIb (BEIIb) derived from Japonica rice is recessive homozygous and the type IIb (BEIIb) locus is recessive homozygous is obtained. In this double mutant, the activity of BEI and BEIIb is lower than that of the wild type. Further, the rice seed of this double mutant has a higher content of indigestible starch than the parent strain, BEIIb-deficient mutant. Specifically, when rice seeds after rice polishing are cooked, the content of the indigestible starch in cooked rice in not ground state is 60% or more and the content of the indigestible starch in the cooked rice in ground state is 20% or more as well as the content of the indigestible starch in brown rice flour of rice seed is 32% or more.SELECTED DRAWING: Figure 1