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棉花海洞不育系为军海不育系与洞庭一号杂交,经多代回交育成的,其小孢子的败育不整齐,从小孢子母细胞开始到减数分裂末,都有所发生。但主要败育在小孢子发育的早期。由于海洞不育系具有军海不育系的显性基因,又为海陆杂交后代,这增加了小孢子母细胞在减数分裂过程中败育的复杂性和多样性。故它的小孢子败育与国内外发现的单纯受显性基因控制的不育系的小孢子败育有别,也与具哈克尼西棉细胞质雄性不育系的小孢子败育不同。同时,还从细胞学上证明了海洞不育系的可育株的小孢子发育具有不稳定性,可能出现不育的小孢子。
CMS CMS is a cross between Junhai CMS and Dongting No.1. After many generations of backcross breeding, its microspore is aborted and inadvertently sprouted from microspore mother cell to meiosis end. . But the main abortion in early microspore development. The CMS of Haidong has the dominant gene of CMS line and is also the cross between offspring of sea and land, which increases the complexity and diversity of abortion of microsporocyte during meiosis. Therefore, its microspore abortion was found to be different from the microspore abortion in sterile lines controlled by dominant genes at home and abroad, and also different from the microspore abortion of cytoplasmic male sterile lines with Huckish-West. At the same time, it was also proved cytologically that the fertile plants of CMSC had unstable microspore development and sterile microspores.