隐金植物：广义加利福尼亚蜡菊及其近缘种（菊科：向日莲族）的分子系统发育再研究。

Cryptic goldfields: a molecular phylogenetic reinvestigation of Lasthenia californica sensu lato and close relatives (Compositae: Heliantheae sensu lato).

机构信息

Jepson Herbarium and Department of Integrative Biology, University of California, 1001 Valley Life Sciences Building # 2465, Berkeley, California 94720-2465 USA.

出版信息

Am J Bot. 2002 Jul;89(7):1103-12. doi: 10.3732/ajb.89.7.1103.

DOI:10.3732/ajb.89.7.1103

PMID:21665710

Abstract

Maximum parsimony analysis of DNA sequence data from the internal and external transcribed spacer (ITS and ETS) regions of 18S-26S nuclear ribosomal DNA and the 3' trnK intron of chloroplast DNA from over 60 populations of Lasthenia sect. Amphiachaenia yielded a well-supported tree showing that the most common species of Lasthenia, L. californica sensu lato (s.l.), is not monophyletic. Members of Lasthenia californica s.l. belong to two well-supported but morphologically cryptic clades. One clade includes members of L. macrantha; the other represents a basally divergent lineage in L. sect. Amphiachaenia. Members of each clade can be diagnosed by pappus morphology and by geographic distribution, except for epappose plants that occur in a broad region of sympatry in central California. Overall diversification in the clade corresponding to L. sect. Amphiachaenia has been accompanied by minimal morphological divergence, which has resulted in previously underappreciated cryptic diversity.

摘要

对来自超过 60 个 Lasthenia 节 Amphiachaenia 种群的 18S-26S 核核糖体 DNA 的内部和外部转录间隔区（ITS 和 ETS）以及叶绿体 DNA 的 3' trnK 内含子的 DNA 序列数据进行最大简约分析，得到了一棵支持良好的树，表明最常见的 Lasthenia 物种，广义的加利福尼亚 Lasthenia（s.l.），不是单系的。广义加利福尼亚 Lasthenia（s.l.）的成员属于两个支持良好但形态上隐蔽的分支。一个分支包括 L. macrantha 的成员；另一个代表 L.sect. Amphiachaenia 中基部分歧的谱系。每个分支的成员可以通过冠毛形态和地理分布来诊断，除了在加利福尼亚中部广泛的同域发生的无冠毛植物。与 L.sect. Amphiachaenia 相对应的分支的总体多样化伴随着最小的形态分歧，这导致了以前被低估的隐生多样性。