Plastid phylogenomics provides new insights into the systematics, diversification, and biogeography of Cymbidium (Orchidaceae)

Plant Diversity, Journal Year: 2024, Volume and Issue: 46(4), P. 448 - 461

Published: March 12, 2024

Cymbidium (Orchidaceae: Epidendroideae), with around 60 species, is widely-distributed across Southeast Asia, providing a nice system for studying the processes that underlie patterns of biodiversity in region. However, phylogenetic relationships have not been well resolved, hampering investigations species diversification and biogeographical history this genus. In study, we construct plastome phylogeny 56 four well-resolved major clades, which provides framework rate analyses. Molecular dating analyses show likely originated region spanning northern Indo-Burma to eastern Himalayas during early Miocene (∼21.10 Ma). It then rapidly diversified into clades East Asia within approximately million years middle Miocene. spp. migration adjacent regions (Borneo, Philippines, Sulawesi) primarily occurred Pliocene-Pleistocene period. Our indicate net has decreased since its origin, positively associated changes temperature monsoon intensity. Favorable hydrothermal conditions brought by intensification possibly contributed initial rapid diversification, after was reduced cooling climate The transition from epiphytic terrestrial habits may enabled adaptation cooler environments colonization niches, yet without significant effect on rates. This study new insights how activity affected dynamics plants Asia.

Language: Английский

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The Nanling Mountains of southern China played a variable role as a barrier and refuge for birds depending upon landscape structure and timing of events

Journal of Avian Biology, Journal Year: 2024, Volume and Issue: 2024(5-6)

Published: Jan. 11, 2024

The Nanling Mountains, an important mountain range and watershed in south China, harbor a wealth of relictual plant species, are considered ‘museum' subtropical biodiversity. With respect to birds, however, the roles Mountains impeding dispersal birds and, as result, shaping their population community structures have received little consideration. To examine these roles, we compiled analyzed two datasets. 1) test mountains' influence on gene flow, undertook comparative phylogeographic study comparing mitochondrial COI Cytb DNA sequences five sylvioid resident bird species mountains (Huet's fulvetta Alcippe hueti , red‐billed leiothrix Leiothrix lutea greater necklaced laughingthrush Pterorhinus pectoralis Indochinese yuhina Staphida torqueola bulbul Ixos mcclellandii ). 2) differential development over history modern examined distributional data all region using public occurrence records. For part 1), sampled 327 individuals from 36 sites conducted correlation analysis genetic geographic distances, taking into account landscape mountains. We found that do not seriously impede flow among populations but influenced differently. 2), 446 81 families indicated family membership composition region. Variation distributions is attributable both environmental evolutionary factors. Overall, currently substantial barrier studied act corridor refuge for birds. However, analyses higher ranked suggest acted older times, corresponding known diversification events southeast Asian avifauna.

Language: Английский

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Meta‐analysis provides insights into the origin and evolution of East Asian evergreen broad‐leaved forests

New Phytologist, Journal Year: 2024, Volume and Issue: 242(5), P. 2369 - 2379

Published: Jan. 8, 2024

Summary Evergreen broad‐leaved forests (EBLFs) are dominated by a monsoon climate and form distinct biome in East Asia with notably high biodiversity. However, the origin evolution of Asian EBLFs (EAEBLFs) remain elusive despite estimation divergence times for various representative lineages. Using 72 selected generic‐level characteristic lineages, we constructed an integrated lineage accumulation rate (LAR) curve based on their crown ages. According to crown‐based LAR, EAEBLF was identified at least as early Oligocene ( c. 31.8 million years ago (Ma)). The genera peaked 25.2 6.4 Ma, coinciding two intensification periods – Miocene Pliocene boundaries, respectively. Moreover, LAR highly correlated precipitation region negatively global temperature, revealed through time‐lag cross‐correlation analyses. An is suggested EAEBLFs, bridging gap between paleobotanical molecular dating studies solving conflicts among previous estimates individual strong correlation brought about emphasizes its irreplaceable role development EAEBLFs.

Language: Английский

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Reconstructing the phylogeny and evolutionary history of freshwater fishes (Nemacheilidae) across Eurasia since early Eocene

Published: Feb. 11, 2025

Eurasia has undergone substantial tectonic, geological, and climatic changes throughout the Cenozoic era, primarily associated with tectonic plate collisions a global cooling trend. The evolution of present-day biodiversity unfolded in this dynamic environment, characterised by intricate interactions abiotic factors. However, comprehensive, large-scale reconstructions illustrating extent these influences are lacking. We reconstructed evolutionary history freshwater fish family Nemacheilidae across spanning most era on base 471 specimens representing 279 species 37 genera. Molecular phylogeny using 6 genes uncovered six major clades within family, along numerous unresolved taxonomic issues. Dating cladogenetic events ancestral range estimation traced origin to Indochina around 48 million years ago. Subsequently, one branch colonised eastern, central, northern Asia, as well Europe, while another expanded into Burmese region, Indian subcontinent, Near East, northeast Africa. These expansions were facilitated connections, favourable conditions, orogenic processes. Conversely, aridification emerged primary cause extinction events. Our study marks first comprehensive reconstruction Eurasian continental scale deep geological time.

Language: Английский

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Pathways of South-Derived Iodine-129 Intrusion into Tibet as Revealed by Its Spatial Distribution

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 489, P. 137570 - 137570

Published: Feb. 11, 2025

Language: Английский

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Multiple Dataset-Based Insights into the Phylogeny and Phylogeography of the Genus Exbucklandia (Hamamelidaceae): Additional Evidence on the Evolutionary History of Tropical Plants

Plants, Journal Year: 2025, Volume and Issue: 14(7), P. 1061 - 1061

Published: March 29, 2025

Southeast Asia's biodiversity refugia, shaped by Neogene-Quaternary climatic shifts and the Tibetan Plateau uplift, preserve relict lineages like Exbucklandia (Hamamelidaceae). Once widespread across ancient continents, this genus now survives in Asian montane forests, offering insights into angiosperm diversification. Chloroplast haplotypes formed three clades-Clade I (E. tricuspis), Clade II populnea), III tonkinensis)-with E. longipetala nested within II/III. Nuclear microsatellites (SSRs) identified two ancestral gene pools: populnea tricuspis showed predominant ancestry Pool A, while tonkinensis were primarily assigned to B. All taxa exhibited localized genetic admixture, particularly sympatric zones. Divergence dating traced genus' origin tropical Asia, with northward colonization of subtropical China ~7 Ma yielding tonkinensis. Quaternary Glacial Cycles triggered southward expansions, chloroplast capture, hybridization. Morphological, nuclear, plastid molecular evidence supports reclassifying as × hybrids lacking cohesion a distinct species mixed nuclear composition. This study highlights how paleoclimate-driven flow phylogeography Asia urgency habitat restoration conserve Exbucklandia.

Language: Английский

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Intergeneric and interspecific relationships in tribe Ricineae revealed by phylogenomics of the plastome and transcriptome

Frontiers in Plant Science, Journal Year: 2025, Volume and Issue: 16

Published: May 1, 2025

Introduction The taxonomy of Euphorbiaceae is extremely difficult, especially the phylogeny closely related genera. In Ricinus , which embraces an important non-food oil-seed crop worldwide, Discocleidion and Speranskia are genera based on molecular evidence (tribe Ricineae), however intergeneric interspecific relationship tribe not well-resolved. Methods Plastome transcriptome were sequenced assembled before maximum likelihood Bayesian inference phylogenetic trees reconstructed. features comparative analyses conducted. Morphological traits explored as supplement to data. Results newly plastomes ranged from 167,327 190,093 bp with typical circular quadripartite structures. longest genome S. tuberculata may due higher number simple sequence repeats. Natural selection pressure chloroplast genes was relatively small likely experienced a population contraction. assembly contig N50 1506 ( D. rufescens ) 2489 ). A total 50,513 cantonensis 78,048 ulmifolium detected, GC content varied between 38.17% 40.01% R. communis three formed well-supported monophyletic lineage, confirmed by different genomic data using methods. supported be related. yunnanensis diverged first divergence followed. Further, morphological similarities lineage relationship. Discussion in Ricineae clearly revealed data, providing genetic basis for future investigations reconstruction Euphorbiaceae.

Language: Английский

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Reconstructing the phylogeny and evolutionary history of freshwater fishes (Nemacheilidae) across Eurasia since early Eocene

eLife, Journal Year: 2025, Volume and Issue: 13

Published: April 4, 2025

Eurasia has undergone substantial tectonic, geological, and climatic changes throughout the Cenozoic, primarily associated with tectonic plate collisions a global cooling trend. The evolution of present-day biodiversity unfolded in this dynamic environment, characterised by intricate interactions abiotic factors. However, comprehensive, large-scale reconstructions illustrating extent these influences are lacking. We reconstructed evolutionary history freshwater fish family Nemacheilidae across spanning most Cenozoic on base 471 specimens representing 279 species 37 genera plus outgroup samples. Molecular phylogeny using six genes uncovered major clades within family, along numerous unresolved taxonomic issues. Dating cladogenetic events ancestral range estimation traced origin to Indochina around 48 mya. Subsequently, one branch colonised eastern, central, northern Asia, as well Europe, while another expanded into Burmese region, Indian subcontinent, Near East, northeast Africa. These expansions were facilitated connections, favourable conditions, orogenic processes. Conversely, aridification emerged primary cause extinction events. Our study marks first comprehensive reconstruction Eurasian continental scale deep geological time.

Language: Английский

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Biogeographic patterns in Southeast Asia: Retrospectives and perspectives

Biodiversity Science, Journal Year: 2023, Volume and Issue: 31(12), P. 23261 - 23261

Published: Jan. 1, 2023

Background & Aims: The regions of Southeast Asia are recognized as global biodiversity hotspots that require conservation priority.Since the mid-19th century, has been widely considered one most important foundations biogeography.This recognition stems from groundbreaking field works Alfred Russel Wallace, who spent eight years to extensively explore and proposed geographic distribution patterns fauna in Malesia (or Malay Archipelago).Wallace's Asia, such famous "Wallace Line"•综述• 华莱士诞辰200周年纪念专题

Language: Английский

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Monsoon influence on plant diversity in northern Indochina: Evidence from the late Miocene Yen Bai flora, northern Vietnam

Palaeogeography Palaeoclimatology Palaeoecology, Journal Year: 2023, Volume and Issue: 634, P. 111925 - 111925

Published: Nov. 22, 2023

Language: Английский

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