Cytomixis in Pollen Mother Cells of New Synthetic Hexaploid Amphidiploid (Aegilops tauschii×Triticum turgidum)

抄録

Hexaploid amphidiploid was obtained from the cross of a tetraploid wheat (T. turgidum L.) landrace Aiganfanmai with Aegilops tauschii, and cytological investigation was carried out during microsporogenesis of this material. High frequency of cytomixis was observed in the pollen mother cells of the new synthetic hexaploid amphidiploid, which occurred at synizesis stage of meiosis. Most chromatins migrated along the pollen sac, only a few were observed to move in cross direction. The chromatins were noticed to transfer from one to one or more adjacent pollen mother cells. Furthermore, aberrant chromosome numbers were found in the new synthetic hexaploid amphidiploid, which suggested that cytomixis might be one cause of the instability of new synthetic amphidiploid.