Evaluating the Monophyly and Biogeography of Cryptantha (Boraginaceae)
Evaluating the Monophyly and Biogeography of Cryptantha (Boraginaceae)
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DOI：
10.1600/036364418x696978
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发表时间：
2018-01-01
影响因子：
1
通讯作者：
Simpson, Michael G.
中科院分区：
文献类型：
--
作者：
Mabry, Makenzie E.;Simpson, Michael G.
Cryptantha是Boraginaceae Amsinckiinae亚族的一个草本植物属，在美洲两热带间断分布，分布于北美西部和南美西部，但不分布在中间的热带地区。在先前的研究中，隐丹属被发现是多系的，并被分成五个属，包括一个弱支持的，潜在的非单系隐丹属。S.在本研究和随后的Amsinckiinae研究中，隐花属内的相互关系通常没有得到有力的支持，样本量通常很低。在这里，我们分析了一个大大增加的采样Cryptantha类群使用高通量，基因组略读数据，其中我们获得了完整的核糖体顺反子，几乎完整的叶绿体基因组，和23个线粒体基因。我们的分析允许推断的分支在这个复杂的强有力的支持。一个非单系的Cryptantha的发生被证实，与三个主要的分支，在这里被称为Johnstonella / Albidae林间空地，Maritimae林间空地，和一个大的Cryptantha核心林间空地，每个强烈支持单系。从这些基因组分析，我们评估的分类，字符的演变，并阐明了目前amphitrophin分布的组的地理历史。揭示了南北美洲之间的传播时间、方向和次数，使人们了解了这些地区巨大生物多样性的起源。
Cryptantha, an herbaceous plant genus of the Boraginaceae, subtribe Amsinckiinae, has an American amphitropical disjunct distribution, found in western North America and western South America, but not in the intervening tropics. In a previous study, Cryptantha was found to be polyphyletic and was split into five genera, including a weakly supported, potentially non-monophyletic Cryptantha s. s. In this and subsequent studies of the Amsinckiinae, interrelationships within Cryptantha were generally not strongly supported and sample size was generally low. Here we analyze a greatly increased sampling of Cryptantha taxa using high-throughput, genome skimming data, in which we obtained the complete ribosomal cistron, the nearly complete chloroplast genome, and twenty-three mitochondrial genes. Our analyses have allowed for inference of clades within this complex with strong support. The occurrence of a non-monophyletic Cryptantha is confirmed, with three major clades obtained, termed here the Johnstonella / Albidae Glade, the Maritimae Glade, and a large Cryptantha core Glade, each strongly supported as monophyletic. From these phylogenomic analyses, we assess the classification, character evolution, and phylogeographic history that elucidates the current amphitropical distribution of the group. Revealing the timing, direction, and number of times of dispersal between North and South America gives insight as to the origin of the great biodiversity of these regions.