Abstract: Two-line intersubspecies rice hybrids Yayou 2, Guangyou 6062 and Three-line hybrid rice Teyou 63 (Check) were used in the study, the results indicated that by the physiological regulations the relationships of sink-source-flow in two-line intersubspecies rice hybrids could be obviously improved, resulting in increasing assimilate for grain filling, decreasing empty and blighted grains, and raising 1000-grain weight. The large effect was found on fertility by amelioration of their plant space environment at the filling stage, while the potential of improving stem and sheath matter translocation to raise grain filling was smaller. Additionally, an inter-planting treatment show that higher fertility in the hybrids could be further expected by improving their pollination and fertilization.

Key words: Intersubspecies rice hybrid, Physiological regulation, Sink-source, Spikelet fertility

关键词: 亚种间杂交水稻, 生理调节, 库源关系, 结实特性