非洲热带蕨类植物 Didymoglossum Desv.属(石蒜科,Polypodiidae)的多样性、分类和历史

IF 3.7 1区 生物学 Q1 Agricultural and Biological Sciences Journal of Systematics and Evolution Pub Date : 2023-02-20 DOI:10.1111/jse.12951
Jean-Yves Dubuisson, Adèle Nivart, Ehoarn Bidault, Vincent Deblauwe, Vincent Droissart, Narcisse G. Kamdem, Germinal Rouhan, Atsushi Ebihara, Timothée le Péchon
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摘要

蕨类植物Didymoglossum属(蕨类植物科)在非洲的种类并不多,最多只有7种。然而,令人惊讶的是,该属在当地的分类学仍存在很大争议,特别是在Didymoglossum erosum复合体中,要么被解释为一个单一的多态种,要么被解释为至少由三个不同但形态非常接近的类群(D. erosum、Didymoglossum chamaedrys和Didymoglossum benlii)组成的一个类群。为了研究这些分类问题,以及更广泛地研究该属在非洲的多样性及其起源,我们进行了完整的解剖形态学分析,并基于 rbcL 进行了分子系统学研究。我们的研究结果支持对所有 7 个物种的确认,其中包括罗宾逊蝶(Didymoglossum robinsonii),它很可能有别于传统上认为非洲种群属于的新热带蝶形花属(Didymoglossum reptans)。我们在此提出了新的特征和新的关键来区分这七个非洲种,其中还包括Didymoglossum ballardianum、Didymoglossum lenormandii和Didymoglossum liberiense。在明确了与所证实的不同进化世系有关的分类学之后,根据对分化时间的估计和对祖先地理区域的重建,讨论了该属在非洲的生物地理历史。这些分析揭示了中生代(白垩纪)Didymoglossum的沧海变迁事件,这也是门叶植物科的第二次变迁事件。
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Diversity, taxonomy, and history of the tropical fern genus Didymoglossum Desv. (Hymenophyllaceae, Polypodiidae) in Africa

The fern genus Didymoglossum (Hymenophyllaceae) is not so diverse in Africa with seven species at most. However, its local taxonomy is surprisingly still strongly debated, in particular within the Didymoglossum erosum complex interpreted either as a single polymorphic species or as a group of at least three distinct but morphologically very close taxa (D. erosum, Didymoglossum chamaedrys, and Didymoglossum benlii). Investigating these taxonomic issues and more generally the diversity of the genus in Africa and its origin, we conducted a complete anatomo–morphological analysis coupled with a molecular phylogenetic work based on rbcL. Our results support the recognition of all seven species, including Didymoglossum robinsonii that is likely distinct from the Neotropical Didymoglossum reptans to which the African populations were traditionally attributed. We here propose new characters and a novel key to distinguish the seven African species which also include Didymoglossum ballardianum, Didymoglossum lenormandii, and Didymoglossum liberiense. Once the taxonomy is clarified with respect to the distinct evolutionary lineages evidenced, the biogeographic history of the genus in Africa is discussed based on a divergence time estimation and the reconstruction of the ancestral geographic areas. These analyses reveal a Mesozoic (Cretaceous) vicariance event within Didymoglossum which is the second one hypothesized for the family Hymenophyllaceae.

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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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