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“杂种优势”是指两个不同来源的亲本进行杂交,其后代表现出比双亲更优越的特性。由于杂种一代的优势最强、最整齐,第二代及以后各代优势就很快减退,并发生遗传性状分离,所以生产上利用的多是杂种第一代。 水稻是自花授粉作物,雌雄同花,花器小,人工杂交很难获得大量杂交种子。为此,必须探寻简便有
“Heterosis” refers to the crossing of two parents of two different origins, which later represent superior characteristics to their parents. Because of the advantages of the hybrid generation strongest, most neat, the advantages of the second generation and later generations will soon decline, and the occurrence of genetic segregation, so the production is mostly used by the first generation of hybrids. Rice is self-pollination crops, monoecious, flower small, artificial hybrid is difficult to get a lot of hybrid seeds. To do that, you have to look for simplicity