生物界普遍存在杂种优势。十九世纪末叶首先应用在玉米上。近十年来我国在生产上利用烟草品种間杂交一代优势取得很大成績。烟草繁殖器官的一些特性对利用杂种优势是有利的。第一,花器大,构造明显,杂交手續簡便;第二,繁殖系数高,杂交一朵花大約可以得到二千粒左右的种子;第三,花期长,一般在三十天以上;第四,花粉耐儲藏,杂交成功率高。加上烟草每亩用种量少,因此,較之其他作物利用杂种优势条件更为优越。凤阳烟草研究所自1955年就开始这項研究工作,几年来选育出凤阳一号(富字六十四号×大平板)、凤阳二号(大平板×云南多叶)二个一代杂交种,以及一个优良杂交后 The biological world prevails heterosis. The end of the nineteenth century first applied to corn. In the past ten years, China has made great achievements in utilizing the superiority of hybrid generation among tobacco varieties in production. Some characteristics of tobacco reproductive organs are advantageous for utilizing heterosis. First, flowers large, obvious structure, simple hybridization procedures; second, the breeding coefficient is high, about one thousand hybrid flowers can be about two thousand seeds; third, long flowering period, usually more than thirty days; fourth, Pollen resistant storage, high success rate of hybridization. Combined with the small amount of tobacco per mu, it is superior to other crops using heterosis. Fengyang Tobacco Institute since 1955 to start this research work, several years bred Fengyang One (64 words × rich flat plate), Fengyang II (large flat plate × Yunnan leaves) two A generation of hybrids, as well as an excellent hybrid