Daphne(胸腺花科)的时间校准系统发育:硬叶植物 Daphne gnidium 的前地中海时间起源

IF 3.7 1区 生物学 Q1 Agricultural and Biological Sciences Journal of Systematics and Evolution Pub Date : 2023-09-12 DOI:10.1111/jse.13018
Cristina Ramos-Capón, Pablo Vargas, Fernando Pomeda-Gutiérrez, Sara Martín-Hernanz
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摘要

硬叶植物综合征的特征非常明显(常绿的珊瑚状叶、不明显的花和肉质果实)。据推测,在地中海气候形成后,表现出硬叶状综合征的品系比非硬叶状品系表现出更低的物种变异率。Daphne gnidium 具有硬叶特征,并在一定程度上分化为三个亚种(gnidium、mauritanica、maritima),但由于缺乏全属的时间校准系统发生,该分类群的时空起源尚不清楚。在此,我们利用内部转录间隔物(ITS)推断了 Daphne 属(32 种,238 个样本)和百日草科其他属(16 属,38 种,34 个样本)的系统发生关系和分化时间,结果表明,Daphne 属目前的划分具有很强的多态性,因为有些种嵌套在 Wikstroemia 属和 Edgeworthia 属中。与此相反,D. gnidium 形成了一个分类学上公认的支持良好的支系(Spachia 亚属)。我们发现 Daphne mauritanica 作为 D. gnidium 的姐妹单系在形态学和系统发生学上都得到了支持。gnidium和D. mauritanica之间的分化似乎早于季节性干旱条件的形成,这支持了该系的前地中海时间起源。根据 66 个 nrDNA(ITS)和 84 个 cpDNA(rps16、trnV)序列进行的 D. gnidium 内部系统地理学分析表明,尽管该物种的分布范围很大,但其在更新世的分化程度很低。总之,D. gnidium 是地中海气候开始后没有物种分化的硬叶综合征的又一个例子。
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Time-calibrated phylogeny of Daphne (Thymelaeaceae): Pre-mediterranean temporal origin of the sclerophyllous Daphne gnidium

The sclerophyllous syndrome is characterized by well-defined traits (evergreen coriaceous leaves, inconspicuous flowers, and fleshy fruits). It has been hypothesized that lineages displaying the sclerophyllous syndrome show lower speciation rates than non-sclerophyllous lineages after the establishment of the mediterranean climate. Daphne gnidium displays sclerophyllous traits and some differentiation into three subspecies (gnidium, mauritanica, maritima), but the spatio-temporal origin of this taxonomic group is unknown due to the lack of a time-calibrated phylogeny of the whole genus. Here, we inferred phylogenetic relationships and divergence times of Daphne (32 species, 238 samples) and other genera of Thymelaeaceae (16 genera, 38 species, 34 samples) using the internal transcribed spacer (ITS), which revealed that the current circumscription of Daphne is profoundly polyphyletic because some species are nested within the genera Wikstroemia and Edgeworthia. In contrast, D. gnidium formed a well-supported clade as recognized in taxonomic accounts (subgenus Spachia). We found morphological and phylogenetic support for Daphne mauritanica as a monophyletic lineage sister to D. gnidium. Divergence between D. gnidium and D. mauritanica appears to have predated the establishment of seasonally dry conditions, which supports a pre-mediterranean temporal origin of the lineage. A phylogeographical analysis within D. gnidium based on 66 nrDNA (ITS) and 84 cpDNA (rps16, trnV) sequences agreed with the low differentiation of the species in the Pleistocene despite its large distribution range. Altogether, D. gnidium illustrates one more example of the sclerophyllous syndrome with no speciation after the onset of the mediterranean climate.

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来源期刊
Journal of Systematics and Evolution
Journal of Systematics and Evolution Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
7.40
自引率
8.10%
发文量
1368
审稿时长
6-12 weeks
期刊介绍: Journal of Systematics and Evolution (JSE, since 2008; formerly Acta Phytotaxonomica Sinica) is a plant-based international journal newly dedicated to the description and understanding of the biological diversity. It covers: description of new taxa, monographic revision, phylogenetics, molecular evolution and genome evolution, evolutionary developmental biology, evolutionary ecology, population biology, conservation biology, biogeography, paleobiology, evolutionary theories, and related subjects.
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