关键词: 杂交中籼稻, 不同穗重型, 气候生态区, 外观品质

Abstract: Eight hybrid midseason-rice varieties out of three panicle weight types, heavy panicle type, medium panicle type and light panicle type of rice, were selected to be cultivated in the six major climatic ecological zones of Sichuan Basin and the variations of appearance quality of rice, length, shape, chalkiness, chalkiness area and translucency of rice, were studied. The research results demonstrate:①In the six major climatic ecological zones, the comprehensive performance of appearance quality of rice is lined in the following order:Wenjiang-western Basin Central Subtropical-long-spring and Summer-drought Zone >Guangyuan-northern Basin Mountainous Subtropical-cold Temperate Zone >Yaan-western Basin Mountain, Central Subtropical-cold Zone >Xichang-luding River Valley, Central Subtropical Mountainous Area, Northern Subtropical Zone >Jiangjin-partial River Valley Southern Subtropical Zone >Nanchong-eastern Basin Central Tropical Most-frequent Summer Drought Zone. Viewed from ecology and geography, there is variety that a higher tendency of appearance quality in the western Basin than in the eastern Basin. ②By studying the performance of appearance quality from the different panicle weight types, in the six major climatic ecological zones, the light panicle type of rice(LPTR) has the best appearance quality followed by the medium panicle type of rice(MPTR), the heavy panicle type of rice(HPTR) has relatively poor performance. ③By considering the adaptability of the different panicle weight types of rice to different climatic ecological zones, Guangyuan-northern Basin Mountainous Subtropical-cold Temperate Zone, Wenjiang-western Basin Central Subtropical-long-spring and Summer-drought Zone and Jiangjin-partial River Valley Southern Subtropical Zone are best suited for the light panicle type of high-quality rice cultivation. However, in the six major climatic ecological zones, the appearance quality of medium panicle type and light panicle type of rice are greatly different, so that varieties of the two panicle weight types should be heavily studied and the varieties corresponding to ecological zones are selected to be cultivated. ④Among the five shapes of the appearance quality studied, the variation of length and shape of rice is relatively small, but the rice chalkiness, chalkiness area and translucency vary greatly.

Key words: hybrid midseason-rice, different panicle weight types, ecological zones, appearance quality