紫茉莉染色体数目及核型分析

紫茉莉Mirabilis jalapa为多年生草本花卉,繁殖能力强,被确定为外来入侵植物。用低温处理法处理紫茉莉根尖12h,经卡诺氏液固定、酸解去壁、改良品红染色等步骤,对紫茉莉进行了染色体数目的确定,对其核型进行了分析。试验结果表明,紫茉莉体细胞染色体数目为2n=56,核型公式为K=2n=2x=28m+22sm+4st+2m(sat),核型分类属于"2B"型。染色体长度变异范围为2.33～0.78μm,属小型染色体,不对称系数63.8%,属于较不对称类型。这为紫茉莉的防控提供了细胞学依据。

The chromosome number and karyotype analysis of Mirabilis jalapa

Mirabilis jalapa was perennial herbal flower with powerful capacity of reproduction as a invasive plant. This paper analyzed the chromosome number and karyotype of M. jalapa with treatments such as 12 h low temperature pretreatment of root tip,fixation with Carnoys solution,cell wall acid hydrolysis and staining. The results showed that the somatic chromosome number of the M. jalapa was 2n=56,and karyotype formula was K=2n=2x=28m+22sm+4st+2m(sat),which belonged to 2B type. The variation range of the chromos...