普通稻种是自花结实形成的．稻种在扬花期间受自然条件影响小，结实率高．籽粒饱满，稻谷的内外颖相互包合紧密，构成完全封闭颖壳，成熟时即使遇雨天，穗发芽很少出现。而杂交稻种子，是由母本颖花开放（母本自花雄性不育）接受外来（父本）花粉授精结实，属异交授粉结实，它? Ordinary rice is self-inflicted form. Rice is less affected by natural conditions during flowering and has a high seed setting rate. Grain full, inside and outside the rice Ying each other close together to form a completely enclosed husk, even when the case of rain when ripe, spike sprouting rarely occurs. The hybrid rice seeds, is the female parent spike flower open (female self-fertile male) to accept foreign (male) pollen insemination, is a cross-pollination strong, it?