摘要
以18SrDNA作为分子标记研究了以粘孢子虫(Myxosporidia)常见属为代表的不同分类水平下的遗传距离分布规律。结果表明,粘孢子虫亲缘关系的远近与遗传距离具有明显的相关性,即粘孢子虫亲缘关系越远遗传距离越大,反之亦然;同时表明,本研究所涉及的种内、种间和属间阶元的遗传距离虽在一定范围内有重叠,但遗传距离由小到大排列依次为种内、种间、属间。研究认为物种之间在遗传距离上可能并不存在绝对的界限,但基于18SrDNA遗传距离的分歧在一定范围内对大多数物种的鉴定是有效的。
In the present study, we used 18S rDNA as a molecular marker to research the distribution of genetic distance of some common genera of the Myxosporea. The results indicated that： there is a significant correlation between genetic relationships and ge- netic distances, species with the close relationship have a short genetic distance, and the reverse is also true; though there are some overlap on the genetic distances among intra-species, inter-species and inter-genera, the general trend of the genetic distance is： in- tra-species〈inter-speeies〈inter-genera. There may be no absolute bound for genetic distances among species, however, in a certain range, the divergence of genetic distance based on 18S rDNA is valid for most of species identification.
出处
《重庆师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第3期31-34,共4页
Journal of Chongqing Normal University:Natural Science
基金
国家自然科学基金项目(No.31101637
No.31172068)
重庆市科委创新建设项目(No.CSTC
2010CA1010)
重庆师范大学博士启动基金(No.11XLB025)
