Kindia (Pavetteae, Rubiaceae), a new cliff-dwelling genus with chemically profiled colleter exudate from Mt Gangan, Republic of Guinea.

Cheek, Martin; Magassouba, Sékou; Howes, Melanie-Jayne R.; Doré, Tokpa; Doumbouya, Saïdou; Molmou, Denise; Grall, Aurélie; Couch, Charlotte; Larridon, Isabel

Kindia (Pavetteae, Rubiaceae), a new cliff-dwelling genus with chemically profiled colleter exudate from Mt Gangan, Republic of Guinea.

Download

Name

peerj-4666.pdf

Description

visibility:open

Size

22.32 MB

Format

Adobe PDF

Checksum (CRC64NVME)

U2fYwFUxCDg=

Resource type

Journal article

Creator (person)

Cheek, Martin

ORCID

Magassouba, Sékou

ORCID

Howes, Melanie-Jayne R.

ORCID

Doré, Tokpa

Doumbouya, Saïdou

Molmou, Denise

Grall, Aurélie

Couch, Charlotte

Larridon, Isabel

Date published

April 20, 2018

Abstract

A new genus (Pavetteae, Rubiaceae) is described with a single species, , based on collections made in 2016 during botanical exploration of Mt Gangan, Kindia, Republic of Guinea in West Africa. The Mt Gangan area is known for its many endemic species including the only native non-neotropical Bromeliaceae . is the fourth endemic vascular plant genus to be described from Guinea Based on chloroplast sequence data, the genus is part of Clade II of tribe Pavetteae. In this clade, it is sister to (including and ). is distinguished from by the combination of the following characters: its epilithic habit; several-flowered axillary inflorescences; distinct calyx tube as long as the lobes; a infundibular-campanulate corolla tube with narrow proximal section widening abruptly to the broad distal section; presence of a dense hair band near base of the corolla tube; anthers and style deeply included, reaching about mid-height of the corolla tube; anthers lacking connective appendages and with sub-basal insertion; pollen type 1; pollen presenter (style head) winged and glabrous (smooth and usually hairy in ); orange colleters producing a vivid red exudate, which encircle the hypanthium, and occur inside the calyx and stipules is a subshrub that appears restricted to bare, vertical rock faces of sandstone. Fruit dispersal and pollination by bats is postulated. Here, it is assessed as Endangered EN D1 using the 2012 IUCN standard. High resolution LC-MS/MS analysis revealed over 40 triterpenoid compounds in the colleter exudate, including those assigned to the cycloartane class. Triterpenoids are of interest for their diverse chemical structures, varied biological activities, and potential therapeutic value.