Studies on the Charecters of the Improved Semi-Dwarf, High-Yielding Indica Rice Varieties : VI. Shape of opaque part of white belly kernels and difference in the development of starch granules on dorsal and ventral sides in developing kernels in the variety making many white belly kernels "Chosaeng Tongil"

Abstract

1. Shape of opaque part of white belly kernels. Most of the opaque part of the white belly kernels of this variety extended near the dorsal side. In this variety, white belly and white milky occurred in the kernel at the same time. 2. Starch granules on the ventral and dorsal sides in developing rice kernel of Chosaeng Tongil were observed using scanning electron microscope. In this study, the observed points were 250 μm to 300 μm interior from pericarp. (a) On the dorsal side: 8 days and 12 days after flowering, small and large starch granules were observed. Their shapes were irregularly spherical, and air-spaces were observed among the granules. 16 days after flowering, the air-spaces were not observed, and starch granules showed sharp edges. And on the surface of the starch granules, the pits due to protein body were observed. (b) On the verltral side: In spite of the passing of the time after flowering, at least after 8 days after flowering, starch granules almost never developed, and their diameters were 2 to 5 μm 30 days after flowering. After 16 days, on the surface of the starch granules, the pits due to enzymes in kernel were observed. But the pits due to protein body were not observed. Their shapes were irregularly spherical, and air-spaces were observed among the starch granules during the whole ripening period.