A floral ontogenetic study on the sister group relationship between the genus Samolus (Primulaceae) and the Theophrastaceae
A floral ontogenetic study on the sister group relationship between the genus Samolus (Primulaceae) and the Theophrastaceae
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DOI：
10.3732/ajb.91.5.627
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发表时间：
2004-05-01
影响因子：
3
通讯作者：
Smets, EF
中科院分区：
文献类型：
--
作者：
Caris, PL;Smets, EF
以前的报春花科从热带和亚热带被分为木本植物Theoprastaceae和Myrsinaceae，以及主要分布于北半球温带地区的草本植物报春花科。最近基于形态和分子数据的分析表明，报春花科Samolus L.与单系科Theophrastaceae有密切的亲缘关系。我们研究了山茶科4个不同属的6种植物的花发育，并将其与Valerandi L.的花个体发育数据进行了比较，以寻找更紧密的亲缘关系的支持。Samolus和Theophrastaceae的成员共享退化雄蕊的存在，以及胎座和胚珠的相似发育。然而，除了习性和分布的不同外，我们还观察到了两个谱系之间的一些重大差异，如在茶树科中没有共同的原基，在Samolus中发育了雌蕊帽，以及退化雄蕊的发育、形状和结构上的差异。因此，我们建议将Samolus与Theoprastaceae的属分开，并建议将其提升到科的水平。
The former Primulales used to be subdivided into the woody Theophrastaceae and Myrsinaceae, from the tropics and subtropics, and the herbaceous Primulaceae, which are mainly found in the temperate regions of the northern hemisphere. Recent analyses based on morphological as well as molecular data revealed a close relationship between the genus Samolus L. of Primulaceae and the monophyletic family Theophrastaceae. We studied the floral development of six species from four different genera of Theophrastaceae and compared it to floral ontogenetical data of Samolus valerandi L. to find support for a close relationship. Samolus and the members of Theophrastaceae share the presence of staminodes and a similar development of the placenta and the ovules. Apart from the different habit and distribution, however, we also observed some major differences between both lineages, such as the absence of common primordia in Theophrastaceae, the development of a gynoecial cap in Samolus, and the difference in development, shape, and structure of the staminodes. Therefore, we propose to keep Samolus separated from the genera of the Theophrastaceae, and we suggest that it be raised to family level.