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Kupeantha (Coffeeae, Rubiaceae), a new genus from Cameroon and Equatorial Guinea

Two new coffee relatives (tribe Coffeeae, Rubiaceae), discovered during botanical expeditions to Cameroon, are examined for generic placement, and the placement of three previously known species (Argocoffeopsis fosimondi, A. spathulata and Calycosiphonia pentamera) is reinvestigated using plastid se...

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Autores principales: Cheek, Martin, Alvarez-Aguirre, Maria G., Grall, Aurélie, Sonké, Bonaventure, Howes, Melanie-Jayne R., Larridon, Isabel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6019108/
https://www.ncbi.nlm.nih.gov/pubmed/29944676
http://dx.doi.org/10.1371/journal.pone.0199324
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author Cheek, Martin
Alvarez-Aguirre, Maria G.
Grall, Aurélie
Sonké, Bonaventure
Howes, Melanie-Jayne R.
Larridon, Isabel
author_facet Cheek, Martin
Alvarez-Aguirre, Maria G.
Grall, Aurélie
Sonké, Bonaventure
Howes, Melanie-Jayne R.
Larridon, Isabel
author_sort Cheek, Martin
collection PubMed
description Two new coffee relatives (tribe Coffeeae, Rubiaceae), discovered during botanical expeditions to Cameroon, are examined for generic placement, and the placement of three previously known species (Argocoffeopsis fosimondi, A. spathulata and Calycosiphonia pentamera) is reinvestigated using plastid sequence (accD-psa1, rpl16, trnL-F) and morphological data. Seed biochemistry of the new species and pollen micromorphology (only one of the two species) are also studied. Based on the plastid sequence data, the new taxa are nested in a well-supported monophyletic group that includes Argocoffeopsis and Calycosiphonia. Within this clade, three well-supported subclades are recovered that are morphologically easy to diagnose: (1) Calycosiphonia (excluding C. pentamera), (2) Argocoffeopsis (excluding A. fosimondi and A. spathulata), and (3) a clade including the above excluded species, in addition to the new species. Based on the results, Kupeantha, a new genus of five species, is described, including two new Critically Endangered taxa from the Highlands of Cameroon: Kupeantha ebo and K. kupensis. Phytochemical analysis of Kupeantha seeds reveals compounds assigned as hydroxycinnamic acid derivatives, amino acids and ent-kaurane diterpenoids; caffeine was not detected. Kupeantha is the first new genus described in tribe Coffeeae in 40 years.
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spelling pubmed-60191082018-07-07 Kupeantha (Coffeeae, Rubiaceae), a new genus from Cameroon and Equatorial Guinea Cheek, Martin Alvarez-Aguirre, Maria G. Grall, Aurélie Sonké, Bonaventure Howes, Melanie-Jayne R. Larridon, Isabel PLoS One Research Article Two new coffee relatives (tribe Coffeeae, Rubiaceae), discovered during botanical expeditions to Cameroon, are examined for generic placement, and the placement of three previously known species (Argocoffeopsis fosimondi, A. spathulata and Calycosiphonia pentamera) is reinvestigated using plastid sequence (accD-psa1, rpl16, trnL-F) and morphological data. Seed biochemistry of the new species and pollen micromorphology (only one of the two species) are also studied. Based on the plastid sequence data, the new taxa are nested in a well-supported monophyletic group that includes Argocoffeopsis and Calycosiphonia. Within this clade, three well-supported subclades are recovered that are morphologically easy to diagnose: (1) Calycosiphonia (excluding C. pentamera), (2) Argocoffeopsis (excluding A. fosimondi and A. spathulata), and (3) a clade including the above excluded species, in addition to the new species. Based on the results, Kupeantha, a new genus of five species, is described, including two new Critically Endangered taxa from the Highlands of Cameroon: Kupeantha ebo and K. kupensis. Phytochemical analysis of Kupeantha seeds reveals compounds assigned as hydroxycinnamic acid derivatives, amino acids and ent-kaurane diterpenoids; caffeine was not detected. Kupeantha is the first new genus described in tribe Coffeeae in 40 years. Public Library of Science 2018-06-26 /pmc/articles/PMC6019108/ /pubmed/29944676 http://dx.doi.org/10.1371/journal.pone.0199324 Text en © 2018 Cheek et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Cheek, Martin
Alvarez-Aguirre, Maria G.
Grall, Aurélie
Sonké, Bonaventure
Howes, Melanie-Jayne R.
Larridon, Isabel
Kupeantha (Coffeeae, Rubiaceae), a new genus from Cameroon and Equatorial Guinea
title Kupeantha (Coffeeae, Rubiaceae), a new genus from Cameroon and Equatorial Guinea
title_full Kupeantha (Coffeeae, Rubiaceae), a new genus from Cameroon and Equatorial Guinea
title_fullStr Kupeantha (Coffeeae, Rubiaceae), a new genus from Cameroon and Equatorial Guinea
title_full_unstemmed Kupeantha (Coffeeae, Rubiaceae), a new genus from Cameroon and Equatorial Guinea
title_short Kupeantha (Coffeeae, Rubiaceae), a new genus from Cameroon and Equatorial Guinea
title_sort kupeantha (coffeeae, rubiaceae), a new genus from cameroon and equatorial guinea
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6019108/
https://www.ncbi.nlm.nih.gov/pubmed/29944676
http://dx.doi.org/10.1371/journal.pone.0199324
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