Phylogenetic position and evolution of glandular structures of the unusual and narrowly distributed genus Rhytidanthera (Ochnaceae)
Phylogenetic position and evolution of glandular structures of the unusual and narrowly distributed genus Rhytidanthera (Ochnaceae)
复制标题
不寻常且分布狭窄的Rhytidanthera属（Ochnaceae）的系统发育位置和腺体结构的进化
DOI：
--
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
C. Parra‐O.
中科院分区：
文献类型：
--
作者：
Sandra Reinales;C. Parra‐O.
Rhytidanthera是唯一具有复叶的属，它形成稀疏的小种群，仅限于哥伦比亚和委内瑞拉安第斯山脉的原始森林以及拉马卡雷纳和Chiribiquete的砂岩山丘。在分类学和系统发育学研究中，它被认为与Godoya，Cespedesia和Krukoviella有关。然而，由于缺乏更广泛的分子和分类学采样，这组中的关系仍然很难解决。本文对包括三个Rhytidanthera spp.在内的三个属的Sauvagesieae族进行了系统发育研究。本文利用一个核区（ITS）和四个质体区（matK、ndhF、rbcL和trnL-F）的序列，对戈多亚属（Godoya）和Cespedesia各一个种的亲缘关系进行了研究。我们恢复了一个新的和良好的支持系统发育的假设，Rhytidanthera姐妹的一个分支，包括Godoya和Cespedesia和Krukoviella形成的分支。这个新热带分支被恢复为单型和非洲属Fleurydora的姐妹。包括Rhytidanthera，Godoya，Cespedesia和Krukoviella的分支由托叶和苞片基部的腺结构（收集器）的存在支持。在该分支中，收集器也在萼片基部进化，但在Cespedesia和Krukoviella中次要丧失。我们认为，组合的大小不等的萼片包围的花芽和存在的收集器在这个分支的成员可能有一个作用，在保护叶和花的早期发展阶段，而不是在传粉吸引。
Rhytidanthera is the only genus of Ochnaceae with compound leaves, and it forms sparse, small populations restricted to the primary forest of the Colombian and Venezuelan Andes and the sandstone hills of La Macarena and Chiribiquete. It has been suggested to be related to Godoya, Cespedesia and Krukoviella in taxonomic and phylogenetic studies. However, the relationships in this group remain poorly resolved, due to the lack of a wider molecular and taxonomic sampling. We present a phylogenetic study of tribe Sauvagesieae including three Rhytidanthera spp. and one species each of Godoya and Cespedesia, using sequences from one nuclear (ITS) and four plastid DNA regions (matK, ndhF, rbcL and trnL-F), in order to clarify the relationships among these four genera. We recover a new and well-supported phylogenetic hypothesis, with Rhytidanthera as sister to a clade comprising Godoya and the clade formed by Cespedesia and Krukoviella. This Neotropical clade was recovered as sister to the monotypic and African genus Fleurydora. The clade comprising Rhytidanthera, Godoya, Cespedesia and Krukoviella is supported by the presence of glandular structures (colleters) at the base of stipules and bracts. The colleters also evolved at the base of the sepals in this clade, with a secondary loss in Cespedesia and Krukoviella. We suggest that the combination of unequal-sized sepals enclosing the floral bud and the presence of colleters in members of this clade could have a role in the protection of leaves and flowers in the early stages of development, instead of acting in pollinator attraction.
新热带奎宁亚科 (Ochnaceae s l ) 的系统发育、分类学和生物地理学
影响因子：
3.4
作者：
Schneider
通讯作者：
Schneider