Phylogenetic systematics of Vigna sensu stricto in the context of Physostigma and allies

IF 2.4 2区 生物学 Q2 PLANT SCIENCES
Dasha M. Horton, Yonas Feleke, Remy S. Pasquet, Firouzeh Javadi, Kaycie A. Melville, Alfonso Delgado-Salinas, Mats Thulin, Richard F. Mithen, Paul Gepts, Ashley N. Egan
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引用次数: 0

Abstract

Premise

Vigna includes economically vital crops and wild species. Molecular systematic studies of Vigna species resulted in generic segregates of many New World (NW) species. However, limited Old World (OW) sampling left questions regarding inter- and intraspecific relationships in Vigna s.s.

Methods

African species, including the putative sister genus Physostigma, were comprehensively sampled within the context of NW relatives. Maximum likelihood and Bayesian inference analyses of the chloroplast matK-trnK and nuclear ribosomal ITS/5.8 S (ITS) DNA regions were undertaken to resolve OW Vigna taxonomic questions. Divergence dates were estimated using BEAST to date key nodes in the phylogeny.

Results

Analyses of matK and ITS data supported five clades of Vigna s.s.: subg. Lasiospron, a reduced subg. Vigna, subg. Haydonia, subg. Ceratotropis, an enlarged subg. Plectrotropis, and a clade including V. kirkii and V. stenophylla. Genome size estimates of 601 Mb for V. kirkii are near the overall mean of the genus, whereas V. stenophylla had a larger genome (810 Mb), similar to some Vigna subg. Ceratotropis or Plectrotropis species.

Conclusions

Former subg. Vigna is reduced to yellow- and blue-flowered species and subg. Plectrotropis is enlarged to mostly all white-, pink-, and purple-flowered species. The age of the split between NW and OW Vigna lineages is ~6–7 Myr. Genome size estimates cannot rule out a polyploid or hybrid origin for V. stenophylla, potentially involving extinct lineage ancestors of Vigna subg. Ceratotropis or Plectrotropis, as indicated by network and phylogenetic analyses. Taxonomic revisions are suggested based on these results.

在 Physostigma 和同属植物背景下的严格意义上的 Vigna 系统学。
前提:Vigna 包括经济上重要的作物和野生物种。对木樨属物种进行分子系统研究后,发现了许多新世界(NW)物种的属种分离。然而,有限的旧世界(OW)取样对木樨属的种间和种内关系留下了疑问:方法:对非洲物种(包括推定的姊妹属 Physostigma)在西北亲缘种范围内进行了全面取样。对叶绿体 matK-trnK 和核核糖体 ITS/5.8 S(ITS)DNA 区域进行了最大似然法和贝叶斯推断分析,以解决 OW Vigna 分类问题。利用 BEAST 对分化日期进行了估计,以确定系统发生中关键节点的日期:结果:对 matK 和 ITS 数据的分析支持 Vigna s.s. 的五个支系:Lasiospron 亚种、缩小的 Vigna 亚种、Haydonia 亚种、Ceratotropis 亚种、扩大的 Plectrotropis 亚种以及包括 V. kirkii 和 V. stenophylla 的支系。kirkii 的基因组大小估计值为 601 Mb,接近该属的总体平均值,而 V. stenophylla 的基因组较大(810 Mb),与一些 Vigna 亚属 Ceratotropis 或 Plectrotropis 物种相似:结论:原 Vigna 亚种减少为黄花和蓝花物种,Plectrotropis 亚种扩大为大部分白花、粉红花和紫花物种。西北Vigna系和西南Vigna系的分裂年龄约为6-7百万年。基因组大小估计不能排除 V. stenophylla 的多倍体或杂交起源,可能涉及已灭绝的 Vigna 亚种 Ceratotropis 或 Plectrotropis 系的祖先,如网络和系统发育分析所示。基于这些结果,建议对分类学进行修订。
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来源期刊
American Journal of Botany
American Journal of Botany 生物-植物科学
CiteScore
4.90
自引率
6.70%
发文量
171
审稿时长
3 months
期刊介绍: The American Journal of Botany (AJB), the flagship journal of the Botanical Society of America (BSA), publishes peer-reviewed, innovative, significant research of interest to a wide audience of plant scientists in all areas of plant biology (structure, function, development, diversity, genetics, evolution, systematics), all levels of organization (molecular to ecosystem), and all plant groups and allied organisms (cyanobacteria, algae, fungi, and lichens). AJB requires authors to frame their research questions and discuss their results in terms of major questions of plant biology. In general, papers that are too narrowly focused, purely descriptive, natural history, broad surveys, or that contain only preliminary data will not be considered.
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