Molecular phylogenetics and generic assessment in the tribe Pavetteae (Rubiaceae)

Block, Petra De; Razafimandimbison, Sylvain G.; Janssens, Steven; Ochoterena, Helga; Robbrecht, Elmar; Bremer, Birgitta

doi:10.12705/641.19

Cited by 23 publications

(70 citation statements)

References 42 publications

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“…Two continental African species not belonging to the Afro-Madagascan clade of De Block et al (2015) were chosen as outgroup taxa: Tarenna precidantenna (clade III of De Block et al 2015) and Leptactina mannii (clade II of De Block et al 2015). All sampled taxa of the Afro-Madagascan clade of De Block et al (2015) were included for this study except for Coptosperma sp.…”

Section: Methodsmentioning

confidence: 99%

“…All sampled taxa of the Afro-Madagascan clade of De Block et al (2015) were included for this study except for Coptosperma sp. nov. A.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, the first molecular phylogenetic study of the Pavetteae (De Block et al 2015) confirmed the monophyly of the tribe and identified four main lineages, all strongly supported as monophyletic although their phylogenetic relationships remained unresolved. Two of these lineages were restricted to continental Africa.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, neither the largest Madagascar-centred genus Coptosperma nor the paleotropical genus Tarenna was recovered as monophyletic. In fact, the phylogeny of the Madagascan Pavetteae was largely unresolved due to low sequence divergence which is in contrast with the high morphological variation present in the group (De Block et al 2015). This phenomenon is encountered in more (Madagascan) plant groups and is interpreted as the result of recent rapid radiation (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…This study focuses on the fourth lineage of De Block et al (2015), hereafter called the Afro-Madagascan clade. We add to the analysis six Madagascan endemics in order to assess their phylogenetic positions within the Afro-Madagascan clade.…”

Section: Introductionmentioning

confidence: 99%

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Four new endemic genera of Rubiaceae (Pavetteae) from Madagascar represent multiple radiations into drylands

Block¹,

Rakotonasolo²,

Ntore³

et al. 2018

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The taxonomic positions and phylogenetic relationships of six Pavetteae species endemic to Madagascar were tested with a phylogenetic study of the Afro-Madagascan representatives of the tribe Pavetteae based on sequence data from six markers rps16, trnT-F, petD, accD-psa1, PI and ITS. The six species were resolved into four well-supported and morphologically distinct clades which we here formally recognise at generic level. The new genera are the monospecific Exallosperma and Pseudocoptosperma, each with a single species, and Helictosperma and Tulearia, each with two species. Each genus is characterised by one or more autapomorphies or by a unique combination of plesiomorphic characters. Mostly, the distinguishing characters are found in fruit and seed; Exallosperma differs from all other Pavetteae genera by the fruit consisting of two stony pyrenes, each with a single laterally flattened seed with irregularly distributed ridges on the surface; Helictosperma is unique by its single spherical seed rolled-in on itself in the shape of a giant pill-millipede. Pseudocoptosperma is characterised by the combination of three ovules pendulous from a small placenta and triangular stipules with a strongly developed awn, whereas Tulearia is characterised by robust sericeous flowers, small leaves, uni- or pauciflorous inflorescences and fruits with two pyrenes, each with a single ruminate seed.The four new genera show marked adaptations to the dry habitats in which they grow. They represent multiple radiations into drylands and highlight the importance of the dry forest and scrub vegetation in western, southern and northern Madagascar for plant biodiversity. The description of the four new genera shows that the tribe Pavetteae exhibits the same pattern as many plant groups in Madagascar, which are characterised by a high proportion of endemic genera comprising a single or a few species.In the four new genera, five new species are described and one new combination is made: Exallosperma longiflora De Block; Helictosperma malacophylla (Drake) De Block, Helictosperma poissoniana De Block, Pseudocoptosperma menabense Capuron ex De Block; Tulearia capsaintemariensis De Block and Tulearia splendida De Block.

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Section: Methodsmentioning

confidence: 99%

“…All sampled taxa of the Afro-Madagascan clade of De Block et al (2015) were included for this study except for Coptosperma sp. nov. A.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Four new endemic genera of Rubiaceae (Pavetteae) from Madagascar represent multiple radiations into drylands

Block¹,

Rakotonasolo²,

Ntore³

et al. 2018

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Settling a family feud: a high‐level phylogenomic framework for the Gentianales based on 353 nuclear genes and partial plastomes

Antonelli

Clarkson

Kainulainen³

et al. 2021

American J of Botany

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Comprising five families that vastly differ in species richness-ranging from Gelsemiaceae with 13 species to the Rubiaceae with 13,775 species-members of the Gentianales are often among the most species-rich and abundant plants in tropical forests. Despite considerable phylogenetic work within particular families and genera, several alternative topologies for family-level relationships within Gentianales have been presented in previous studies. METHODS:Here we present a phylogenomic analysis based on nuclear genes targeted by the Angiosperms353 probe set for approximately 150 species, representing all families and approximately 85% of the formally recognized tribes. We were able to retrieve partial plastomes from off-target reads for most taxa and infer phylogenetic trees for comparison with the nuclear-derived trees. RESULTS:We recovered high support for over 80% of all nodes. The plastid and nuclear data are largely in agreement, except for some weakly to moderately supported relationships. We discuss the implications of our results for the order's classification, highlighting points of increased support for previously uncertain relationships. Rubiaceae is sister to a clade comprising (Gentianaceae + Gelsemiaceae) + (Apocynaceae + Loganiaceae). CONCLUSIONS:The higher-level phylogenetic relationships within Gentianales are confidently resolved. In contrast to recent studies, our results support the division of Rubiaceae into two subfamilies: Cinchonoideae and Rubioideae. We do not formally recognize Coptosapelteae and Luculieae within any particular subfamily but treat them as incertae sedis. Our framework paves the way for further work on the phylogenetics, biogeography, morphological evolution, and macroecology of this important group of flowering plants.

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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 phylogenetics and generic assessment in the tribe Pavetteae (Rubiaceae)

Cited by 23 publications

References 42 publications

Four new endemic genera of Rubiaceae (Pavetteae) from Madagascar represent multiple radiations into drylands

Four new endemic genera of Rubiaceae (Pavetteae) from Madagascar represent multiple radiations into drylands

Settling a family feud: a high‐level phylogenomic framework for the Gentianales based on 353 nuclear genes and partial plastomes

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

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