棉花晋A不育系小孢子发育的超微结构研究

Ultra-structural Observations on the Microsporogenesis in Jin A CMS Line of Cotton

对晋A细胞质雄性不育系小孢子发育的超微结构观察发现,晋A不育系在造孢细胞增殖时期即表现出败育迹象。绒毡层细胞质膜断裂破碎,细胞质解体,线粒体、质体等细胞器解体,绒毡层细胞提前解体退化,并可看到明显的细胞质和细胞核浓缩现象。因此,我们认为,小孢子败育过程中绒毡层细胞解体是一种与细胞程序性死亡(PCD)有关的有序过程。

Through ultra-structural observation,it was found that the microspore of Jin A began to abort at the stage of sporogenous cell division.During the abortion period of the CMS line,the cell membrane of microspore and tapetum dissolved,cytoplasm degenerated,the cell organelles such as mitochondria and plastid and the tapetal cells became degenerated and disorganized.It was also found that nuclear and cytoplasm began to concentrated in tapetal cells,these were morphological features of PCD.So,we think that tapetal cells disorganization may be one type of PCD that occurs in plants.Certainly,these must be proved at molecular level.