Reinstatement of Nepenthes hemsleyana (Nepenthaceae), an endemic pitcher plant from Borneo, with a discussion of associated Nepenthes taxa

Scharmann, Mathias; Grafe, T. Ulmar

doi:10.3767/000651913x668465

Cited by 9 publications

(3 citation statements)

References 4 publications

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“…and the “giant form” ( N. rafflesiana g.f.), as informally described by Clarke (1992, 1997). Morphospecies determination follows current taxonomy (Cheek and Jebb 2001; Scharmann and Grafe 2013).…”

Section: Methodsmentioning

confidence: 99%

“…and the "giant form" (N. rafflesiana g.f.), as informally described by Clarke (1992Clarke ( , 1997. Morphospecies determination follows current taxonomy (Cheek and Jebb 2001;Scharmann and Grafe 2013). Most samples were collected in primary peat swamp or heath forest, except for Singapore, where only secondary vegetation was available.…”

Section: Sampling Design and Field Sitesmentioning

confidence: 99%

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Genomic evidence for rapid speciation and gene flow between sympatric carnivorousNepenthespitcher plants

Scharmann

Metali

Grafe

et al. 2023

Preprint

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Speciation can result from both neutral and adaptive processes, but their relative importance and the factors exerting selective pressures are incompletely understood. In theory, interspecific gene flow could suffice to reverse speciation, or else erode neutral divergence and expose traits and underlying genes whose divergence is due to selection. Hence, introgression can shed light on selection during the speciation process. Here we study mixed assemblages of carnivorous Nepenthes pitcher plants, which frequently produce natural hybrids yet maintain distinct phenotypes. Using ddRAD-seq markers, we characterize divergence and introgression for eight Nepenthes species that grow sympatrically in communities of three to seven species at four locations in Southeast Asia, totalling 22 populations. The sympatric species fell into two discrete classes of high and low divergence. Five lineages with high divergence displayed little recent introgression in tests of location-dependent allele sharing (ABBA-BABA) despite the presence of some natural hybrids. However, all five lineages appear to have introgressed in the more distant past, as revealed by coalescent models with Approximate Bayesian Computation. In the same locations occur three further sympatric species with low genetic divergence. These incipient species also showed some natural hybrids, but in addition both ABBA-BABA tests and ABC suggested very recent or ongoing introgression, raising the question how divergence is maintained in these hybrid zones. One trait possibly involved in maintenance of divergence against gene flow might be the carnivorous pitcher traps, whose morphology showed greater divergence than expected under neutral evolution (Pst-Fst) in the introgressing species pair N. hemsleyana and N. rafflesiana t.f.

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Section: Methodsmentioning

confidence: 99%

Section: Sampling Design and Field Sitesmentioning

confidence: 99%

Genomic evidence for rapid speciation and gene flow between sympatric carnivorousNepenthespitcher plants

Scharmann

Metali

Grafe

et al. 2023

Preprint

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show abstract

“…nivea. Nepenthes hemsleyana (endemic to Borneo) was initially treated as a natural variety of N. rafflesiana until Scharmann and Grafe [33] revised this taxon as a species of its own. Recently, a natural variety of N. rafflesiana discovered in Johor and Terengganu was launched as var.…”

Section: Notesmentioning

confidence: 99%

Insights into The Diversity of Nepenthes L. (Nepenthaceae) Across Peninsular Malaysia, Including The First Sighting of an Undescribed Taxon with Flared Peristomes and Quadruple-Row Ventral Wings

Tamizi,

Mohamad,

Shakri

et al. 2023

J-SuNR

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The discoveries of six taxa between 2019 and 2022 have brought the total number of Nepenthesspecies occurring in Peninsular Malaysia to 18. This article serves as a comprehensive overview, incorporating the latest information and taxonomic insightsconcerningallspecies native to the peninsula. The information is derived from published taxonomic records and cumulative field observations conducted since 2013.Notably, it further reports heretoforeundocumented discoveries, making it a significant contribution to the current knowledgeof tropical pitcher plants. Theseinclude a sighting of a population of Nepenthes with unusual traits in the upper montane forest of Banjaran Titiwangsa, which may represent the 19thtaxonin Peninsular Malaysia. The plantsexhibit conspicuously expandedperistomes and an unusual wing morphology, which altogether provide compelling evidence supporting the recognition of these individuals as a distinct and previously unknown species. Therefore, a provisional taxonomic name—Nepenthessp. Titiwangsa (pesonawangsa_223) A. Amin—is assigned.The species is inferred to belongto the N. macfarlaneigroup based on its toothed peristome and the presence of fine hairs below the lid. The partial description, speciesnote, photographs,and a dichotomous keyof the proposednew speciesare provided.In addition, a velvety N. sanguineapopulation has been observed in northern Banjaran Titiwangsa and treated as a new natural variation (var. velutina) in this article.

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Sex is determined by XY chromosomes across the radiation of dioeciousNepenthespitcher plants

et al. 2019

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Species with separate sexes (dioecy) are a minority among flowering plants, but dioecy has evolved multiple times independently in their history. The sex‐determination system and sex‐linked genomic regions are currently identified in a limited number of dioecious plants only. Here, we study the sex‐determination system in a genus of dioecious plants that lack heteromorphic sex chromosomes and are not amenable to controlled breeding: Nepenthes pitcher plants. We genotyped wild populations of flowering males and females of three Nepenthes taxa using ddRAD‐seq and sequenced a male inflorescence transcriptome. We developed a statistical tool (privacy rarefaction) to distinguish true sex specificity from stochastic noise in read coverage of sequencing data from wild populations and identified male‐specific loci and XY‐patterned single nucleotide polymorphsims (SNPs) in all three Nepenthes taxa, suggesting the presence of homomorphic XY sex chromosomes. The male‐specific region of the Y chromosome showed little conservation among the three taxa, except for the essential pollen development gene DYT1 that was confirmed as male specific by PCR in additional Nepenthes taxa. Hence, dioecy and part of the male‐specific region of the Nepenthes Y‐chromosomes likely have a single evolutionary origin.

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Reinstatement of Nepenthes hemsleyana (Nepenthaceae), an endemic pitcher plant from Borneo, with a discussion of associated Nepenthes taxa

Cited by 9 publications

References 4 publications

Genomic evidence for rapid speciation and gene flow between sympatric carnivorousNepenthespitcher plants

Genomic evidence for rapid speciation and gene flow between sympatric carnivorousNepenthespitcher plants

Insights into The Diversity of Nepenthes L. (Nepenthaceae) Across Peninsular Malaysia, Including The First Sighting of an Undescribed Taxon with Flared Peristomes and Quadruple-Row Ventral Wings

Sex is determined by XY chromosomes across the radiation of dioeciousNepenthespitcher plants

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