Phylogenetics of <i>Dendrochilum</i> (Orchidaceae): Evidence of pronounced morphological homoplasy and predominantly centric endemism

Pedersen, Henrik Ærenlund; Petersen, Gitte; Gravendeel, Barbara; Barkman, Todd J.; Boer, Hugo de; Sulistyo, Bobby P.; Seberg, Ole

doi:10.1002/tax.12184

Cited by 5 publications

(3 citation statements)

References 61 publications

(114 reference statements)

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“…However, this subgenus rank was later synonymized under an expanded subg. Platyclinis (Benth) Pfitzer (Pedersen et al 2019) as supported by molecular evidence. Protologues of Philippine Dendrochilum species were reviewed and it was closely diagnosed to D. vanoverberghii Ames (1912: 27) endemic to Mt.…”

Section: Methodsmentioning

confidence: 75%

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2020

Phytotaxa

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Dendrochilum ignisiflorum is hereby described and illustrated as a new species of orchid endemic to Luzon Island, Philippines. The species resembles D. vanoverberghii by having petiolate leaves, channelled petioles, labellum of the same size, and the erect to suberect incurved column but distinct by the sub-globose or broadly ellipsoid pseudobulb, 3 distinct leaf veins, barely spreading flowers, lanceolate and revolute dorsal sepal, and the absence of callus in the labellum.

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Section: Methodsmentioning

confidence: 75%

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2020

Phytotaxa

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“…The scale of the inhibitory effect was scored as follows: high (diameter zone ≥17 mm), intermediate (14 ≤ diameter zone <16 mm), low (diameter zone ≤13 mm) (CLSI, 2011). Previously generated DNA sequences for necklace orchids (Gravendeel et al, 2001;Subedi et al, 2011;Sulistyo et al, 2015;Pedersen et al, 2020) were downloaded from NCBI GenBank (see Supplementary Table S2 for more details). In addition, new DNA sequences were generated from 77 specimens of the necklace orchid genus Glomera.…”

Section: Antimicrobial Activity Of Plants Extractsmentioning

confidence: 99%

“…A phylogenetic analysis was carried out using Bayesian Inference (BI) with Arundina graminifolia as an outgroup based on earlier studies (Gravendeel et al, 2001;Pedersen et al, 2020) that showed this genus to be most closely related to the necklace orchids. The chosen nucleotide substitution model GTR+G was calculated using the Akaike Information Criterion (AIC) in jModelTest2 v.2.1.6 (Darriba et al, 2015).…”

Section: Sequence Editing and Phylogenetic Analysismentioning

confidence: 99%

Antimicrobial Activity of Necklace Orchids is Phylogenetically Clustered and can be Predicted With a Biological Response Method

et al. 2021

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Necklace orchids (Coelogyninae, Epidendroideae) have been used in traditional medicine practices for centuries. Previous studies on a subset of unrelated orchid species utilized in these traditional practices revealed they possessed antimicrobial, anti-inflammatory, and anti-oxidant activity, providing experimental proof for their medicinal properties. To date however none of these species have been investigated ethno-botanically in a phylogenetic context. This study carried out comparative bioprospecting for a group of wild orchids using EBDCS (the Economic Botany Data Collection Standards) organ targeted and biological response methods. The traditional medicinal use of necklace orchids was recorded from books and journals published between 1984 and 2016. Two orchids, Coelogyne cristata and Coelogyne fimbriata, were selected, cultivated both indoors and outdoors, and the antimicrobial properties on extracts from their leaves and pseudobulbs tested against a selection of human pathogens. A molecular phylogeny of Coelogyninae based on nuclear ribosomal ITS and plastid matK DNA sequences obtained from 148 species was reconstructed with Maximum Likelihood (ML) using RAxML, Maximum Parsimony (MP) using PAUP and Bayesian Inference using MrBayes. Bioprospecting comparison of EBDCS and biological response was carried out using customized R scripts. Ethanolic extracts obtained from leaves of C. fimbriata inhibited growth of Bacillus cereus, Staphylococcus aureus, and Yersinia enterocolitica, confirming the antimicrobial properties of these extracts. Leaf extracts were found to have slightly stronger antimicrobial properties for plants cultivated outdoors than indoors. These differences were not found to be statistically significant though. Three hot nodes with high potency for antimicrobial activities were detected with the EBDCS organ targeted classification method, and eight hot nodes were detected with the biological response classification method. The biological response classification method is thus a more effective tool in finding hot nodes amongst clades of species with high medicinal potential.

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Integrative analyses ofCrepidium(Orchidaceae, Epidendroideae, Malaxideae) shed more light on its relationships withDienia,LiparisandMalaxisand justify reinstatement of narrow endemicC. allanii

Kumar¹,

Li²,

Gale³

2021

Botanical Journal of the Linnean Society

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Malaxidinae are a cosmopolitan higher Epidendroid subtribe of > 1250 species that exhibit wide morphological and ecological diversity. Despite almost two centuries of taxonomic deliberation, controversy persists regarding the delimitation of practically all Malaxidinae genera, the most important of which are Crepidium, Dienia, Liparis and Malaxis. Previous attempts to classify these genera using a molecular phylogenetic approach showed Liparis and Malaxis to be polyphyletic and the floral characters traditionally used to define them as homoplastic. Emphasis has instead shifted to vegetative and ecological traits. Here, we conduct an expanded analysis of nuclear (ITS) and plastid (matK) sequences focused on terrestrial taxa, with the resulting phylogram largely corroborating the emerging picture, and we test the efficacy of four previously highlighted traits to recover the same relationships. Although growth habit is underscored as important for resolving a natural distinction between epiphytic Liparis and terrestrial ‘Crepidium clade’ plus ‘Malaxis clade’ taxa, leaf shape and venation and habitat preference are shown to be poor predictors of phylogenetic affiliation. Instead, perennating organ structure (heteroblastic or homoblastic) and placement (predominantly above- or below-ground) – are incisive, with leaf number and texture apparently correlated. These findings are discussed in the context of an inferred evolutionary history of the subtribe. Although homoplastic at the subtribe level, some floral characters are shown to be useful for resolving identities at the species level. Accordingly, the status of four long-confused species (Crepidium acuminatum, C. allanii, C. purpureum and Microstylis biloba) is resolved.

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Phylogenetics of Dendrochilum (Orchidaceae): Evidence of pronounced morphological homoplasy and predominantly centric endemism

Cited by 5 publications

References 61 publications

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Antimicrobial Activity of Necklace Orchids is Phylogenetically Clustered and can be Predicted With a Biological Response Method

Integrative analyses ofCrepidium(Orchidaceae, Epidendroideae, Malaxideae) shed more light on its relationships withDienia,LiparisandMalaxisand justify reinstatement of narrow endemicC. allanii

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