State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.
State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan 430074, China.
Mol Phylogenet Evol. 2018 Jul;124:181-191. doi: 10.1016/j.ympev.2018.03.005. Epub 2018 Mar 13.
Sabiaceae comprises three genera and ca. 80 species with an amphi-Pacific tropical disjunct distribution. It has been unclear whether the family is monophyletic, where the family belongs within the angiosperm phylogeny, and when and how is present-day disjunct distribution originated. To address these questions, we conducted a phylogenetic analysis of Sabiaceae with comprehensive sampling of the family and basal eudicots using six chloroplast DNA loci (atpB, rbcL, matK, ndhF, atpB-rbcL and trnL-trnF). Our results support the monophyly of Sabiaceae s. l. that includes three genera: Meliosma Blume, Ophiocaryon Endl. and Sabia Colebr. The placement of Sabiaceae as sister to Proteales receives moderate bootstrap support, and is corroborated by various alternative hypothesis tests. Within Sabiaceae, Ophiocaryon and Sabia were resolved as strongly supported clades, whereas Meliosma was paraphyletic with Ophiocaryon nested within it. The biogeographically disjunct accessions of Meliosma alba (which is alternatively known as Kingsboroughia alba (Schltdl.) Liebm.) sampled from southwestern China and Mexico form a monophyletic group. Molecular dating and ancestral area reconstruction suggest a Eurasian origin of Sabiaceae in the late Cretaceous and a boreotropical range expansion during Paleogene. Southward migrations were inferred from continental Eurasia to the Malesian region in Sabia and in the Asian Meliosma, and from Central America to South America in the Neotropical clade of Meliosma in response to climatic cooling after the late Miocene. A long distance dispersal from Central America to tropical Asia was suggested during the time at the Neogene and Quaternary boundary in Meliosma alba (now recognized as Kingsboroughia alba). Our results also support the recognition of Kingsboroughia Liebm. as a distinct genus to maintain the monophyly of each of the genera: Meliosma, Ophiocaryon and Sabia. Kingsboroughia along with Meliosma and Ophiocaryon constitutes the subfamily Meliosmoideae Mast., while Sabia is the sole genus of Sabioideae Y.W. Law & Y.F. Wu.
安息科包括三个属和约 80 个种，具有环太平洋热带间断分布的特点。一直不清楚该科是否是单系的，属于被子植物系统发育的哪个位置，以及现代间断分布是如何起源的。为了解决这些问题，我们对安息科进行了系统发育分析，全面采样了该科和基类被子植物的六个叶绿体 DNA 基因座（atpB、rbcL、matK、ndhF、atpB-rbcL 和 trnL-trnF）。我们的结果支持安息科的单系性，包括三个属：Meliosma Blume、Ophiocaryon Endl. 和 Sabia Colebr. 安息科与 Proteales 的姐妹关系得到了中等 bootstrap 支持，并得到了各种替代假设检验的支持。在安息科中，Ophiocaryon 和 Sabia 被解析为强烈支持的分支，而 Meliosma 是并系的，其中 Ophiocaryon 嵌套在其内。来自中国西南部和墨西哥的具有生物地理间断分布的 Meliosma alba（也被称为 Kingsboroughia alba (Schltdl.) Liebm.）的采集标本形成了一个单系群。分子定年和祖先区重建表明，安息科起源于白垩纪晚期的欧亚大陆，并在古近纪时期经历了热带的扩张。从欧亚大陆向南的迁移被推断为 Sabia 和亚洲 Meliosma 从中亚大陆到马来亚地区，以及 Neotropical 分支的 Meliosma 从中美洲到南美洲，以应对中新世晚期以来的气候变冷。在 Meliosma alba（现被认为是 Kingsboroughia alba）中新近纪和第四纪边界时期，从中美洲长距离散布到热带亚洲。我们的结果也支持将 Kingsboroughia Liebm. 作为一个独特的属来维持 Meliosma、Ophiocaryon 和 Sabia 每个属的单系性。Kingsboroughia 与 Meliosma 和 Ophiocaryon 一起构成了 Meliosmoideae Mast. 亚科，而 Sabia 是 Sabioideae Y.W. Law & Y.F. Wu 亚科的唯一属。
