前期阶细胞减数分裂的第一个阶段，其间染色体浓缩且能被看见，核细胞膜衰弱。
The first stage of mitosis, during which the chromosomes condense and become visible, the nuclear membrane breaks down, and the spindle apparatus forms at opposite poles of the cell.
同一花药不同花粉囊相同一药室，花粉母细胞减数分裂和小孢子的发育，并不是高度同步的。
It is not synchronous highly that the meiosis of pollen mother cells and the development of microspore in the same anther but different pollen sac and in the same anther chamber.
解决了激光显微分离系统染色体样本制备的难题，使杨树花粉母细胞减数分裂染色体激光显微分离成为可能。
Some results as follows, 1. Chromosome preparation for laser micro-dissection system was solved, which indicated that laser micro-dissection of PMCs meiotic chromosomes in Populus was feasible.
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