| Abstract: | The factors influencing pollen chromosome doubling in Zenjimaru persimmon were studied,based on the knowledge of meiosis process of pollen mother cells. The results showed: (1) the suitable concen-tration of colchicine was 0.3 - 0.5%; (2) the best doubling effect could be obtained during the period fromthe dipiotene stage to the diakinasis stage, and the highest proportion was up to 40.6 %; (3) considering giantpollen ratio and proportion of staminate-flower collection, the better treating frequency was 3 times; (4) giantpollen, which formed mainly from dyad and had bigger cell nucleus volume, was unreduced and hexaploid. |
