沙打旺有丝分裂染色体形态变化的观察

A study on chromosomal patterns of mitosis of Astragalus adsurgens

在观察沙打旺根尖有丝分裂过程中，晚前期看到１４＋４的染色体图像，即１４条长的染色体和４条长度相近的短“染色体”，而且从晚前期至中期的过渡中，４条短“染色体”有两两彼此不断靠近，最后显现为２条染色体的变化过程。

The chrom osorn al number of body cells of A. adsurgens is 2n=16. But the authors observed14+4 chromosomal pattern at the late-prophase,it means that there are 14 longer chromosomes and 4shorter chromsomes. From late-prophase to metaphase,the short chromosomes are constantly close untilthey form two complete chromosomes,According to the analysis,the appearance of 14+4 chromosonlalpatterns is due to the different degree of coiling at centromemarea of differen t chromosome.