Bulbophyllum hamatum (Orchidaceae), a new species from Hubei, central China

Qi, Yan; Li, Xinwei; Jinqing, Wu

doi:10.11646/phytotaxa.523.3.9

Cited by 1,274 publications

(7 citation statements)

References 5 publications

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“…pingnanense and B . inconspicuum ( Figure 7 ), with lateral sepals connected partly and sub-umbellate raceme [ 19 ], basically in accordance with the characteristics of sect Cirrhopetalum . The phylogenetic analysis further strongly supported that B .…”

Section: Discussionsupporting

confidence: 61%

“…Additionally, B. ambrosia and B. gedangense formed a separate and strongly supported clade. Notably, B. hamatum , a newly described species belonging to sect Cirrhopetalum and recently published by Yan et al [ 19 ], appeared as a sister to B. tianguii (sect Brachyantha ). Subsequently, B. violaceolabellum (sect Brachyantha ) was also a sister to these two species with strong support (BP = 100, PP = 1.00).…”

Section: Resultsmentioning

confidence: 99%

“…hamatum , being a member of sect Cirrhopetalum and closely related to B . omerandrum based on a morphological comparison [ 19 ], was close to two species from sect Brachyantha ( B . tianguii and B .…”

Section: Discussionmentioning

confidence: 99%

“…These studies have clarified the phylogenetic relationships of different regions in this group, but nodal support values of the main clades or lineages were moderate to low or lacking for some relationships. The number of accepted species continues to grow as new discoveries are reported [ 19 , 20 , 21 ]; taxonomic work on Bulbophyllum became a major challenge, and further investigation into the relationships within the genus necessitates more detailed study.…”

Section: Introductionmentioning

confidence: 99%

“…Bulbophyllum, comprising approximately 2200 species, is one of the largest genera of Orchidaceae and serves as an excellent model system for investigating orchid biodiversity [1][2][3]. Its distribution spans pantropical regions, including Africa, Madagascar, the 2 of 19 Americas, and the Asia-Pacific region [4]. Members of this genus exhibit epiphytic or lithophytic habits and typically possess one-or two-leaved pseudobulbs with a labellum attached to the base of the floral column via an elastic hinge [4,5].…”

Section: Introductionmentioning

confidence: 99%

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The Complete Chloroplast Genomes of Bulbophyllum (Orchidaceae) Species: Insight into Genome Structure Divergence and Phylogenetic Analysis

Wu,

Zeng,

Wang

et al. 2024

IJMS

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Bulbophyllum is one of the largest genera and presents some of the most intricate taxonomic problems in the family Orchidaceae, including species of ornamental and medical importance. The lack of knowledge regarding the characterization of Bulbophyllum chloroplast (cp) genomes has imposed current limitations on our study. Here, we report the complete cp genomes of seven Bulbophyllum species, including B. ambrosia, B. crassipes, B. farreri, B. hamatum, B. shanicum, B. triste, and B. violaceolabellum, and compared with related taxa to provide a better understanding of their genomic information on taxonomy and phylogeny. A total of 28 Bulbophyllum cp genomes exhibit typical quadripartite structures with lengths ranging from 145,092 bp to 165,812 bp and a GC content of 36.60% to 38.04%. Each genome contained 125–132 genes, encompassing 74–86 protein-coding genes, 38 tRNA genes, and eight rRNA genes. The genome arrangements, gene contents, and length were similar, with differences observed in ndh gene composition. It is worth noting that there were exogenous fragment insertions in the IR regions of B. crassipes. A total of 18–49 long repeats and 38–80 simple sequence repeats (SSRs) were detected and the single nucleotide (A/T) was dominant in Bulbophyllum cp genomes, with an obvious A/T preference. An analysis of relative synonymous codon usage (RSCU) revealed that leucine (Leu) was the most frequently used codon, while cysteine (Cys) was the least used. Six highly variable regions (rpl32-trnLUAG > trnTUGU-trnLUAA > trnFGAA-ndhJ > rps15-ycf1 > rbcL-accD > psbI-trnSGCU) and five coding sequences (ycf1 > rps12 > matK > psbK > rps15) were identified as potential DNA markers based on nucleotide diversity. Additionally, 31,641 molecular diagnostic characters (MDCs) were identified in complete cp genomes. A phylogenetic analysis based on the complete cp genome sequences and 68 protein-coding genes strongly supported that 28 Bulbophyllum species can be divided into four branches, sects. Brachyantha, Cirrhopetalum, and Leopardinae, defined by morphology, were non-monophyly. Our results enriched the genetic resources of Bulbophyllum, providing valuable information to illustrate the complicated taxonomy, phylogeny, and evolution process of the genus.

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Section: Discussionsupporting

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%