籼稻与粳稻杂交,即O.sativa L.subsphsien Ting与O.sativa L.Keng Ting杂交。国内外育种工作者曾经做过许多研究。已经发现过这亚种之间的杂交F_1表现强大的生物学优势。穗数、粒数也大大增加,引入向往。虽然大多数组合结实率不高,但也有少数结实率高的组合。这种“少数”为利用这种类型的杂种优势提供了可能性,正是研究觅取的组合。在我们的科研实践中也看到了这种的现象。试图通过研究获得比现有组合优势更强,其他性状更好的新组合。结实率不高是第一个难关,因此,以往的研究在提高F_1的结实率方面多做了一些工作。现将研究进展初报如下: Indica and japonica hybrids, that O.sativa L.subsphsien Ting and O.sativa L.Keng Ting hybridization. Breeders at home and abroad have done a lot of research. It has been found that F1 between hybrids of this subspecies exhibits a strong biological advantage. Spike number, particle size is also greatly increased, the introduction of longing. Although most combinations have low seed setting rates, there are a few combinations with high seed setting rates. This “minority” offers the possibility of exploiting this type of heterosis, which is exactly the combination that the research seeks. In our research practice also saw this phenomenon. Trying to gain new combinations that have stronger advantages over existing combinations and better other traits through research. The low rate of seed setting is the first difficulty. Therefore, previous studies have done some work in improving the seed setting rate of F_1. The research report is as follows: