J4 ›› 2015, Vol. 14 ›› Issue (12): 82-88.

• 生命科学 • 上一篇    下一篇

基于ITS序列的梅花草属Parnassia L.系统发育初步研究

  

  1. (大理大学农学与生物科学学院,云南大理671003)
  • 收稿日期:2015-03-30 出版日期:2015-12-15 发布日期:2015-12-15
  • 作者简介:柏梦焱,园艺专业2012级本科生.
  • 基金资助:

    云南省高校滇西生物多样性科研创新团队项目(云教函〔2011〕93号);大理学院质量工程项目(TDI-05)

Preliminary Study on Phylogeny of Parnassia L. Based on ITS Sequences

  1. (College of Agriculture and Biology Science, Dali University, Dali, Yunnan 671003, China)
  • Received:2015-03-30 Online:2015-12-15 Published:2015-12-15

摘要:

基于ITS序列,采用3种构树方法对梅花草属Parnassia L.植物30个种的系统发育进行了研究,分析了梅花草属分类系
统的合理性;分析了3对有争议物种的亲缘关系:绿花梅花草P. viridiflora 与三脉梅花草P. trinervis、类三脉梅花草P. pusilla 与
中国梅花草P. chinensis、中国梅花草P. Chinensis 与高山梅花草P. cacuminum。结果表明:采用贝叶斯推理构建出的系统发育
树在拓扑结构上表现出最高的稳定性;佐证了当前梅花草属植物分类系统的合理性;虽然绿花梅花草和三脉梅花草的ITS序
列同源性达99.1%,但在形态学分类尚未作出改变前,仍需要进一步确定两者的亲缘关系;分子分析手段只能推断类三脉梅花
草和中国梅花草具有非常相近的亲缘关系,并不能证明为同一物种;推测高山梅花草与中国梅花草二者外观形态可能存在连
续性变异,可能为同一物种,需要更多其他分子片段的序列分析进一步证实二者亲缘关系。

关键词: 亲缘关系, 分类系统, 同源性, 连续性变异

Abstract:

Three phylogenetic trees were constructed with different methods to analyze the reliability of the classification system of
genus Parnassia using ITS gene sequences from 30 species. Meanwhile, the genetic relationships of P. viridiflora vs. P. trinervis; P.
pusilla vs. P. chinensis; P. chinensis vs. P. cacuminum also have been analyzed in this paper. The results showed that Bayesian
Inference(BI)tree has the highest stability in topology and the reliability of the classification system of genus Parnassia has been
proved with molecular data. The above three species pairs showed very high genetic relationships, P. viridiflora and P. trinervis with
99.1%, P. pusilla and P. chinensisbut with 96.7%, P. chinensis and P. cacuminum with 99.06% ITS sequences homolog. However, with
the exception of pair P. chinensis and P. cacuminum, both of the other two pairs showed different morphological traits. In this study, the
potential reasons for the morphological variances have been discussed. More detailed phylogenetic and morphological analysis would
help to figure out the relationships among these species precisely.

Key words: genetic relationship, classification system, homology, continuous variation

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