一粒小麦小孢子发生过程中的细胞并合

经检测,在正常的一粒小麦(TriticummonococumL.)中有细胞并合发生.细胞并合仅存在于减数分裂的凝线期,核物质从一个花粉母细胞到邻近花粉母细胞的转移是通过胞质通道进行的.细胞并合的发生是自发的,且在花粉母细胞中有方向性.本次调查中未观察到花粉败育现象,具细胞并合的植株结实也未受影响.中期Ⅰ一些花粉母细胞的染色体数目有变化,这造成一些花粉母细胞在后期Ⅰ时出现非正常分离.由于异常花粉母细胞很少,孟德尔分离比例仍然成立.这被认为是在常规遗传分析中不能检测出细胞并合的效应的原因.

Cytomixis during Microsporogenesis in einkorn wheat

Occurrence of cytomixis was detecled in normal einkorn wheat (Tritlcum monococum I...). Presence of cytomixis was restricted only in the synizesis stage of meiotic division. Transfer of nuclear materials from one pollen mothcr cell (PMC) to adjacent PMCs take place through cytoplasmic connections, and it occurred spontaneously and in specific direction within the PMCs, Pollen abortion was not observed in this investigation, and normal seed setting was not aftected in the plants which were affected by cytomixis. At metaphase I some PMCs carried varied chromosomes, which causde abnormal separations occur in soem PMCs at anaphase I. Because the abnormal PMCs were very rare, the Mendel's segregation rate was still fitted. This was considered as the cause that the effect of cylomixis could not be identified in general genetic analysis.