棉花为常异花授粉作物。在进行遗传研究和杂交育种时,应采用纯系材料,这已为大家所公认。但由于过去人工自交技术繁琐,实际未能认真实行,人工的纯系材料极少,致使棉花的遗传研究较为薄弱,杂交育种效率不高,随着人工自交技术的简化与提 Cotton is often cross-pollination crops. It is generally accepted that pure materials should be used in genetic research and crossbreeding. However, due to the cumbersome artificial selfing technology in the past and the fact that it was not practically implemented, artificial purebred materials are extremely rare, resulting in weaker genetic research on cotton and less efficient hybridization and breeding. With the simplification of artificial selfing techniques