Abstract
Several diploid non-glutinous and diploid glutinous varieties, haploid, diploid, triploid and tetraploid pure lines of glutinous (var. Saitamamochi) and non-glutinous (var. Norin-No. 8) rice plants were used as materials to compare the properties of starch grains contained in their all tissues. The starch grains were examined under a microscope in regard to their iodin reaction. 1) In the glutinous varieties, the starch grains only in pollen and endosperm were glutinous and those in the other parts of the plant were non-glutinous. In non-glutinous varieties, starch grains in all the tissues including pollen and endosperm were non-glutinous according to the reaction 2) The glutinous starch seems to be not directly correlated to polyploidy of rice plant of plant organs, but would be correlated to some special organs such as pollen and endosperm.
