阔口尖毛虫皮层纤毛器微管在不同生理条件下的分化

应用激光扫描共聚焦显微术,显示腹毛类纤毛虫阔口尖毛虫(Oxytricha platystoma)无性生殖过程中,新的口围带、波动膜、额腹横棘毛、左右缘棘毛微管先后分化,老纤毛器微管去分化,细胞分裂产生各含一套纤毛器微管的前、后两仔虫;生理改组过程中,口围带、波动膜、额腹横棘毛、左右缘棘毛微管发生去分化和再分化,细胞皮层微管胞器更新形成含一套纤毛器微管的新细胞。结果表明阔口尖毛虫在无性生殖和生理改组这两种不同的生理条件下,其纤毛器微管结构的形成或更新可能具有相同的细胞调控机制,形态发生中老纤毛器结构可能对新结构的发生和发育具有诱导定位和物质贡献的作用。

The differentiation of cortical ciliature microtubules of Oxytricha platystoma under different physiological conditions

The cortical ciliature microtubules of one hypotrichous ciliate Oxytricha platystorna were visualized by confocal laser scanning microscopy. During the process of asexual reproduction, when old ciliature microtubules disintegrated, new adoral zone of mem- branelles （AZM）, undulating membranes （UM）, frontal-ventral-transverse cirri （FVTC） and left and fight marginal cirri （L-and RMC） were differentiated in order. And one cell divided into one proter and one opisthe, both had one set of eiliature mierotubules. During the process of physiological reorganization, adoral zone of membranelles （ AZM ）, undulating membranes （ UM ）, frontal-ven- tral-transverse cirri （FVTC） and left and right marginal cirri （L-and RMC） were dedifferentiated first and then redifferentiated. And the cortical mierotubular organelles of the cell were renewed to be a new cell with one set of eiliature microtubules. The results showed that during the different processes of asexual reproduction and physiological reorganization, the regulation mechanism for forming and renewing ciliature microtubules of Oxytricha platystoma was same and the old ciliature might play a role of inducing location and physical contribution to the new ones during the processes of morphogenesis.