属间远缘杂交新型水稻灌浆成熟期冠层叶片光合产物分配去向

DISTRIBUTION OF ASSIMILATES DERIVED FROM CANOPY LEAVES AT DIFFERENT MILKY STAGE OF INTERGENERIC HIGH YIELDING HYBRID RICE

Distribution characteristics of assimilates derived from 14 C glucose fed on different canopy leaves of the high yielding intergeneric hybrid rice Yuanyou 1 and GER 1, intravarietal 3 line hybrid rice Shanyou 63, maternal and paternal parents of intergeneric hybrid rice at various ripening stage from flowering stage to late milky stage were studied with pot experiments under greenhouse in 1993 and 1994 in Guangzhou. The results indicates that there exists a significant difference in exportation of radioactivity from the leaf fed, partitioning of radioactivity exported into different organs and importation accumulation percent of total radioactivity in the rice panicle Yuanyou 1 has a high average exportation percent, importation accumulation percent and a stable and sustainable grain filling process, which results in a high seed setting rate with large spikelet population.