关键词: 籼稻, 发育, 品质性状, 淀粉形成体, 垩白

Abstract: A comparison of the caryopsis development, rice quality characteristics and the size, pattern, structure of the endosperm amyloplasts (starch granules) in the two indica rice varieties was made.The quality traits in Yangdao 6 were better than those in Xiangzaoxian 33. In the primary period after flowering, the dry matter in Yangdao 6 was accumulated more slowly than that in Xiangzaoxian 33 but faster in the later period, and the starch was filled strongly in the later period after flowering.There were two kinds of amyloplasts: single and compound amyloplasts, 4.7 μm and 9.7μm in diameter on average with the range of 2.4-8.0 μm and 5.7-19.5 μm, respectively. In the case of the endosperm of Xiangzaoxian 33, most of the single amyloplasts were elliptic or round with loose arrangement and great difference in size, and the coefficient of variation was high;While in the endosperm of Yangdao 6, most of the amyloplasts were single, well developed, polyhedral, crystalline and compact-arranged, and the coefficient of variation was low. The amyloplasts in dorsal part of endosperm were developed better than those in abdomen and center. The chalkiness in the endosperm resulted from badly-developed and loose-arranged starch, which was closely relevant to the transport of filling materials.

Key words: indica rice, development, quality traits, amyloplast, chalkiness