Molecular phylogenetic species delimitation in the aquatic genus Ottelia (Hydrocharitaceae) reveals cryptic diversity within a widespread species

Yu, I.; Tanaka, Norio; Barfod, Anders S.; Bogner, Josef; Li, Jie; Yano, Okihito; Gale, Stephan W.

doi:10.1007/s10265-019-01109-7

Cited by 14 publications

(11 citation statements)

References 39 publications

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“…Besides, we also suggest that O. balansae should be treated as a variety of O. acuminata . This point has also been put forward by Yu Ito et al (2019). It will also help us have a better understanding of the diversity and evolution of sex evolution in Ottelia .…”

Section: Resultsmentioning

confidence: 79%

Ottelia fengshanensis, a new bisexual species of Ottelia (Hydrocharitaceae) from southwestern China

Li¹,

Wu²,

Zou³

et al. 2019

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Ottelia fengshanensis, a new species (Hydrocharitaceae) from southwest China is here described and illustrated. Comparing its morphological features to putative close relatives O. guanyangensis, it has 3–4 flowers (vs. 2–5) each spathe, hexagonal-cylindric fruit, white styles (vs. yellow), green leaves (vs. dark green) and fruit tiny winged (vs. winged obviously). Molecular phylogenetic investigation of four DNA sequences (ITS, rbcL, trnK5’ intron and trnS-trnG) and the Poisson Tree Processes model for species delimitation (PTP) analysis, further resolves O. fengshanensis as a new species that is close to O. guanyangensis with distinct support.

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Section: Resultsmentioning

confidence: 79%

Ottelia fengshanensis, a new bisexual species of Ottelia (Hydrocharitaceae) from southwestern China

Li¹,

Wu²,

Zou³

et al. 2019

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“…Ottelia Persoon (Hydrocharitaceae) is a pantropic genus with ∼21 species of submerged macrophytes primarily distributed in tropic Africa and southeast Asia, according to the most comprehensive taxonomic revision of the genus (Cook et al, 1983). However, recent studies based on DNA sequence data reveal that two widespread species within the genus, namely Ottelia alismoides (Ito et al, 2019) and O. ulvifolia (Li et al, 2020b), contain cryptic species, suggesting that the alpha taxonomy of Ottelia remains ambiguous. Given that the majority of species within the genus are threatened with local or global extinction (Phillips et al, 2016;Zhang et al, 2017), a credible taxonomy is necessary for conservation and management of extant Ottelia species.…”

Section: Introductionmentioning

confidence: 99%

Deciphering the Taxonomic Delimitation of Ottelia acuminata (Hydrocharitaceae) Using Complete Plastomes as Super-Barcodes

Yang

Landis

et al. 2021

Front. Plant Sci.

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Accurate species delimitation and identification, which is a challenging task in traditional morphology-based taxonomy, is crucial to species conservation. Ottelia acuminata (Hydrocharitaceae) is a severely threatened submerged macrophyte endemic to southwestern China. The taxonomy of O. acuminata, which has long been in dispute, remains unresolved, impeding effective conservation and management practices. Here, we aim to address the long-standing issues concerning species boundary and intraspecific subdivision of O. acuminata using complete plastome sequences as super-barcodes. The taxonomic delimitation of O. acuminata was explored using phylogenetic inference and two independent sequence-based species delimitation schemes: automatic barcode gap discovery (ABGD) and multi-rate Poisson tree processes (mPTP). The reciprocally reinforcing results support the reduction of the closely related congeneric species, O. balansae and O. guanyangensis, as two conspecific varieties of O. acuminata. Within the newly defined O. acuminata, accurate varietal identification can be achieved using plastome super-barcodes. These findings will help inform future decisions regarding conservation, management and restoration of O. acuminata. This case study suggests that the use of plastome super-barcodes can provide a solution for species delimitation and identification in taxonomically difficult plant taxa, thus providing great potential to lessen the challenges of inventorying biodiversity, as well as biologically monitoring and assessing threatened species.

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“…Recent advances in the methodology of coalescent species delimitation have helped reveal cryptic diversity in a wide range of organisms (Fujita et al 2012;Rannala 2015). In plants, multi-locus sequence data of chloroplast and nuclear DNA have been used to test taxonomic boundaries established through morphology-based circumscriptions of species (e.g., Jones et al 2015;Ito et al 2019;Li et al 2020). Here we apply two species delimitation analyses, namely STACEY (Jones 2017) and BPP (Yang 2015), with the aim of assessing the following taxonomic questions central to an improved understanding of the phylogenetic history of Nothapodytes: (i) whether undetected cryptic diversity exists within the widespread N. nimmoniana, and (ii) whether N. amamianus is a valid, genetically distinct taxon.…”

Section: Introductionmentioning

confidence: 99%

Molecular species delimitation reveals underestimated diversity in the tree genus Nothapodytes (Icacinaceae)

Yadav

Chang

et al. 2021

Plant Syst Evol

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Nothapodytes (Icacinaceae) is a genus of seven to eleven evergreen or deciduous tree species distributed in tropical Asia from India to Japan. Nothapodytes nimmoniana sensu lato is the most widespread species of the genus, being reported sporadically throughout South Asia, Southeast Asia, Taiwan, and Japan's southwest islands. Nothapodytes amamianus was recently described from Amami-oshima, Japan, the northeastern edge of this widespread species' range. However, the phylogenetic distinction between these two species has yet to be explored. Here we present an analysis of molecular species delimitation to test the morphology-based taxonomic hypothesis currently used to differentiate the two species. The results clearly show that N. nimmoniana sensu lato comprises two species, one in India and the other in Taiwan and Japan, including N. amamianus, requiring a reassessment of the morphological traits hitherto used to define the former and distinguish it from the latter in East Asia. Based on the taxonomic history of the taxa and rules of nomenclature, the name N. nimmoniana is retained for the former. We propose a new combination, N. insularis, for the latter. Longitudinal intraspecific geographic structure is highlighted as an apparent indicator of further hidden diversity in India's Western Ghats.

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Molecular phylogenetic species delimitation in the aquatic genus Ottelia (Hydrocharitaceae) reveals cryptic diversity within a widespread species

Cited by 14 publications

References 39 publications

Ottelia fengshanensis, a new bisexual species of Ottelia (Hydrocharitaceae) from southwestern China

Ottelia fengshanensis, a new bisexual species of Ottelia (Hydrocharitaceae) from southwestern China

Deciphering the Taxonomic Delimitation of Ottelia acuminata (Hydrocharitaceae) Using Complete Plastomes as Super-Barcodes

Molecular species delimitation reveals underestimated diversity in the tree genus Nothapodytes (Icacinaceae)

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