Heidelberg Institute of Plant Science, Department of Biodiversity and Plant Systematics, University of Heidelberg, Im Neuenheimer Feld 345, D-69120 Heidelberg, Germany.
Mol Phylogenet Evol. 2010 May;55(2):524-40. doi: 10.1016/j.ympev.2010.02.012. Epub 2010 Feb 17.
Phylogenetic analyses of sequence data from the internal transcribed spacer regions of the nuclear ribosomal DNA (ITS) and the plastid trnL-F region were conducted to reconstruct the phylogenetic history of Draba and related genera. Out of the approximately 370 Draba species, 169 geographically and morphologically representative species are sampled here, including such "controversial" segregates as Abdra, Arabis, Athysanus, Drabopsis, Erophila, Graellsia, Heterodraba, Schivereckia and Tomostima. Phylogenetic analyses of the combined ITS and trnL-F markers indicate that Draba represents a monophyletic evolutionary lineage within the tribe Arabideae, but previously proposed infrageneric classification systems are mostly artificial (i.e. do not reflect true evolutionary history). Draba muralis formed an independent genus, possibly between Draba and Arabis, whereas D. hystrix fell outside Draba and was closely associated with Arabis. The New World annual, lowland Draba, D. platycarpa, D. reptans, D. cuneifolia, D. australis, D. arabidoides, (section Abdra) and D. brachycarpa and D. aspera (section Tomostima), appear to be independent genera that fall outside Draba and are monophyletic with the endemic North American Heterodraba unilateralis and Athysanus pusillus. Graellsia hederifolia and Erophila verna appear to be earlier diverging Draba species, with weak evidence of ancient hybridization in G. hederifolia. Core Draba species were organized into three major groups that encompass the segregate genera Drabopsis and Schivereckia. The three groups have geographic significance: Group I-Europe to Iran; Group II-North and South American Cordillera; Group III-Asian, Arctic, and Beringian. These three groups also have significant petal color and base chromosome level similarities. We also found that Arabis rimarum is a synonym for Draba aucheri, and is well within Group I of Core Draba. Therefore, we propose that many of the lowland and coastal temperate species often associated with Draba should be excluded from that genus. The compilation of these data indicate that true Draba are highly migrating arctic and higher alpine species that are most often perennial with white petals and n=8 as plesiomorphic characters.
对核核糖体 DNA（ITS）内部转录间隔区和质体 trnL-F 区的序列数据进行系统发育分析，以重建 Draba 及其相关属的系统发育历史。在大约 370 种 Draba 物种中，这里采样了 169 种具有地理和形态代表性的物种，包括 Abdra、Arabis、Athysanus、Drabopsis、Erophila、Graellsia、Heterodraba、Schivereckia 和 Tomostima 等“有争议”的分类群。ITS 和 trnL-F 标记的联合分析表明，Draba 代表 Arabideae 族中的一个单系进化谱系，但以前提出的种下分类系统大多是人为的（即不反映真实的进化历史）。Draba muralis 形成一个独立的属，可能在 Draba 和 Arabis 之间，而 D. hystrix 则不在 Draba 之外，与 Arabis 密切相关。新大陆一年生低地 Draba，D. platycarpa、D. reptans、D. cuneifolia、D. australis、D. arabidoides（Abdra 组）和 D. brachycarpa 和 D. aspera（Tomostima 组），似乎是独立的属，与 Draba 无关，与特有北美 Heterodraba unilateralis 和 Athysanus pusillus 一起形成单系。Graellsia hederifolia 和 Erophila verna 似乎是较早分化的 Draba 物种，在 G. hederifolia 中存在较弱的古老杂交证据。核心 Draba 物种分为三大组，包含 segregate 属 Drabopsis 和 Schivereckia。这三个组具有地理意义：组 I-欧洲到伊朗；组 II-北美和南美山脉；组 III-亚洲、北极和白令海。这三个组也具有显著的花瓣颜色和基础染色体水平的相似性。我们还发现，Arabis rimarum 是 Draba aucheri 的同义词，并且完全属于核心 Draba 的组 I。因此，我们建议将许多与 Draba 相关的低地和沿海温带物种排除在该属之外。这些数据的汇集表明，真正的 Draba 是高度迁徙的北极和高山物种，通常是多年生的，具有白色花瓣和 n=8 作为原始特征。
