Molecular phylogeny of Galium L. of the tribe Rubieae (Rubiaceae) – Emphasis on Chinese species and recognition of a new genus Pseudogalium

Yang, Li-E; Meng, Ying; Peng, Deli; Nie, Ze‐Long; Sun, Hang

doi:10.1016/j.ympev.2018.04.004

Cited by 16 publications

(27 citation statements)

References 30 publications

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“…For the number of leaf elements, both a model of unordered character state change and a model of ordered character state change were used. In the latter, character states are ordered according to an increase in number and size of stipular elements (see above) in agreement with previous hypotheses [13]. Priors on the trait rates were modelled as gamma distributions with both shape and scale 1.0, those on the clock rates were modelled as exponential distributions with mean 1.0.…”

Section: Methodssupporting

confidence: 57%

“…Although there is ambiguity with respect to the interpretation of the Rubieae leaf whorls (summarized in [14]), comparison with the phyllotaxis in other Rubiaceae suggests that these whorls most likely evolved from opposite leaves with two interpetiolar stipules via enlargement and increase in number of stipules. This plausible evolutionary sequence is supported by some statistical character state reconstructions [13], but is in obvious conflict with others [10], which suggest leaf/stipule whorls with at least six elements as ancestral in Rubieae. Further character changes of interest, which often have been used for taxonomic purposes, include life-form (perennials versus annuals), corolla shape (trumpet-like versus rotate, historically used for the separation of Asperula and Galium ), pollen type (used to distinguish Rubieae from other tribes [8,9]) as well as fruit structure (dry versus fleshy).…”

Section: Introductionmentioning

confidence: 88%

“…A preliminary report on phylogenetic relationships within Rubieae using an extended taxon sampling was given by Ehrendorfer and Barfuss [12]. Recently, Yang et al [13] addressed relationships within Rubieae using a broad sampling with an expanded focus on species occurring in China.…”

Section: Introductionmentioning

confidence: 99%

“…To this end, we analyze sequences from two plastid spacer regions, atpB-rbcL and rpl32 - trnL , as well as morphological and biogeographic data using maximum parsimony and Bayesian methods. Specifically, we aim (i) to phylogenetically place so far unstudied Rubieae (such as Mericarpaea ), thus providing a refined framework to evaluate discrepancies between phylogenetic relationships and the current taxonomy of the tribe, (ii) to test existing hypotheses (e.g., [10,13]) on the evolution of leaf whorls, and (iii) to develop a biogeographic scenario for Rubieae.…”

Section: Introductionmentioning

confidence: 99%

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Phylogeny, character evolution and spatiotemporal diversification of the species-rich and world-wide distributed tribe Rubieae (Rubiaceae)

et al. 2018

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The Rubiaceae tribe Rubieae has a world-wide distribution with up to 1,000 species. These collectively exhibit an enormous ecological and morphological diversity, making Rubieae an excellent group for macro- and microevolutionary studies. Previous molecular phylogenetic analyses used only a limited sampling within the tribe or missed lineages crucial for understanding character evolution in this group. Here, we analyze sequences from two plastid spacer regions as well as morphological and biogeographic data from an extensive and evenly distributed sampling to establish a sound phylogenetic framework. This framework serves as a basis for our investigation of the evolution of important morphological characters and the biogeographic history of the Rubieae. The tribe includes three major clades, the Kelloggiinae Clade (Kelloggia), the Rubiinae Clade (Didymaea, Rubia) and the most species-rich Galiinae Clade (Asperula, Callipeltis, Crucianella, Cruciata, Galium, Mericarpaea, Phuopsis, Sherardia, Valantia). Within the Galiinae Clade, the largest genera Galium and Asperula are para- and polyphyletic, respectively. Smaller clades, however, usually correspond to currently recognized taxa (small genera or sections within genera), which may be used as starting points for a refined classification in this clade. Life-form (perennial versus annual), flower shape (long versus short corolla tube) and fruit characters (dry versus fleshy, with or without uncinate hairs) are highly homoplasious and have changed multiple times independently. Inference on the evolution of leaf whorls, a characteristic feature of the tribe, is sensitive to model choice. Multi-parted leaf whorls appear to have originated from opposite leaves with two small interpetiolar stipules that are subsequently enlarged and increased in number. Early diversification of Rubieae probably started during the Miocene in western Eurasia. Disjunctions between the Old and the New World possibly are due to connections via a North Atlantic land bridge. Diversification of the Galiineae Clade started later in the Miocene, probably in the Mediterranean, from where lineages reached, often multiple times, Africa, eastern Asia and further on the Americas and Australia.

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Section: Methodssupporting

confidence: 57%

Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phylogeny, character evolution and spatiotemporal diversification of the species-rich and world-wide distributed tribe Rubieae (Rubiaceae)

et al. 2018

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“…Galium L., with about 667 species distributed worldwide, is the largest genus of the tribe Rubieae in the family Rubiaceae (Yang et al, 2018). It is a taxonomically problematic genus and its species groups are often poorly differentiated morphologically and geographically.…”

Section: Introductionmentioning

confidence: 99%

Stipa richteriana (Poaceae) and Galium songaricum (Rubiaceae): two new additions of the Central Asian species to the flora of Iran

Behroozian

Ejtehadi

Memariani

et al. 2019

nbr

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Stipa richteriana and Galium songaricum are newly recorded species for the flora of Iran, collected from Binalood and Hezar-Masjed Mountains in Razavi Khorassan Province. The geographical distribution of both species is mainly confined to the Middle Asia. Morphological characters of two newly recorded species are compared with their close relatives. Notes on taxonomy, ecology, phytogeography, and conservation status of both species are provided.

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Phylogeny and classification of the coffee family (Rubiaceae, Gentianales): Overview and outlook

Razafimandimbison,

Rydin

2024

TAXON

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The use of molecular data in phylogenetic reconstruction during more than three decades has greatly improved our understanding of the macroevolutionary history of the coffee family (Rubiaceae) and has provided a solid basis for improvement of its classification. Based on the results of 130 studies, among them most recent phylogenomic works, we present a consensus phylogeny and a robust classification of Rubiaceae that shed light on the evolutionary success of this highly diverse angiosperm family and can serve as a framework for ecological and evolutionary studies. There are more than 14,000 species and about 580 accepted genera of Rubiaceae that are assigned to 71 tribes, of which 68 are classified in two subfamilies (Dialypetalanthoideae with 38 tribes and Rubioideae with 30 tribes). Three tribes (Acranthereae, Coptosapelteae, Luculieae) remain unclassified as to subfamily. Sixty‐three of these 71 tribes are assigned to nine informal alliances (four in Rubioideae and five in Dialypetalanthoideae). These tribes are listed in alphabetical order within their respective alliances. Five tribes, one (Coussareeae) in Rubioideae and four (Airospermeae, Jackieae, Retiniphylleae, Steenisieae) in Dialypetalanthoideae, are excluded from these alliances due to unclear or conflicting phylogenetic positions. Thirty‐six tribes retain their tribal status but receive new generic limits to remedy their previous para‐ or polyphyletic nature. Twenty‐nine tribes not implemented in previous classifications have been added, of which three (Chioneae, Glionnetieae, Temnopterygeae) are newly described here. Basic information on phylogenies, distributions, former classifications, and useful references to previous works are provided for all accepted tribes, and future perspectives are discussed.

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Molecular phylogeny of Galium L. of the tribe Rubieae (Rubiaceae) – Emphasis on Chinese species and recognition of a new genus Pseudogalium

Cited by 16 publications

References 30 publications

Phylogeny, character evolution and spatiotemporal diversification of the species-rich and world-wide distributed tribe Rubieae (Rubiaceae)

Phylogeny, character evolution and spatiotemporal diversification of the species-rich and world-wide distributed tribe Rubieae (Rubiaceae)

Stipa richteriana (Poaceae) and Galium songaricum (Rubiaceae): two new additions of the Central Asian species to the flora of Iran

Phylogeny and classification of the coffee family (Rubiaceae, Gentianales): Overview and outlook

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