【摘要】 对来自航天诱变凤仙花突变体院-3的子代(SP2)的减数分裂行为进行了研究.对13株子代(SP2)的细胞学观察发现,减数分裂中期Ⅰ均为7个二价体(7Ⅱ),表明SP1减数分裂的不均等分离未能导致SP2非整倍体变异.并首次发现SP2小孢子在发育早期以“凹陷式“和“出芽式”分裂形成小花粉粒.分析认为:SP1减数分裂中的不均等分离和多极分离的主要原因是由航天条件下多种因素造成的生理损伤所致,是不遗传的.“凹陷式”和“出芽式”分裂是SP2花粉败育的主要原因.该分裂方式可能与基因突变有关.更多还原

【Abstract】 The meiotic behavior in SP2 generation from Impatiens balsamina Yuan-3 induced by space flight has been investigated in this study.It was found that all the observed 13 plants showed 7 bivalent(7Ⅱ) in meiotic metaphase Ⅰ,suggesting the unequal segregation of meiosis in SP1 plants could not result the aneuploid variation in SP2 generation.The divided types were observed first dividing in the way of "cavatus" and "budding" at early stage of microspore development to form small pollen grains.It is thought that the main reason of unequal segregation and poly-pole segregation of meiosis in SP1 was resulted from various physiological damages by space flight factors,which was not hereditary.The division of "cavatus" and "budding" is the main reason to produce sterile pollen grains in SP2,and the division type may relate to gene mutation.更多还原