The uplift of the Hengduan Mountains contributed to the speciation of three Rhododendron species

Wang, Kailai; Zhou, Xiaohui; Liu, Detuan; Li, Youzhi; Yao, Zhi; He, Weiming; Liu, Yongbo

doi:10.1016/j.gecco.2022.e02085

Cited by 4 publications

(3 citation statements)

References 77 publications

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“…In addition, an alternative reason is that four Cycas species have a limited geographical range with small and isolated populations, which likely results in high levels of genetic drift and inbreeding [61,62]. It is consistent with other narrow-ranged species, for example, the threatened species Thuja sutchuenensis (FST = 0.011-0.191 for cpSSR) [77] and three endangered Rhododendron species (FST = 0.128-0.387 for RAD-seq) [78]. Thus, rare species with small populations generally have low genetic diversity compared to those species with large and widespread geographical populations [79,80], such as Paeonia decomposita [81], Mentha cervine [82], and Omphalogramma souliei [83].…”

Section: Discussionsupporting

confidence: 65%

Genetic Structure and Differentiation of Endangered Cycas Species Indicate a Southward Migration Associated with Historical Cooling Events

Yao

Wang

et al. 2023

Diversity

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Understanding the genetic structure and differentiation in endangered species is of significance in detecting their phylogenetic relationships and prioritizing conservation. Here we sampled five endangered Cycas species endemic to southwest China and genotyped genetic structure and differentiation among them using the genotyping-by-sequencing (GBS) method. C. hongheensis showed high genetic diversity, but the other four species showed low genetic diversity. The genetic diversity between wild and cultivated populations was similar for C. debaoensis and C. guizhouensis, respectively. Low genetic differentiation and high gene flow were found among C. debaoensis, C. guizhouensis, and C. fairylakea, and C. hongheensis differentiated from them at ~1.74 Mya. TreeMix results showed historic migration events from C. guizhouensis to C. hongheensis, showing southward migration pathways. C. hongheensis showed increased effective population size with time, while the other four species underwent bottleneck events at ~1–5 Mya when continuous cooling events occurred. Our results indicate that the migration, differentiation, and speciation of Cycas species are associated with historical cooling events.

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Section: Discussionsupporting

confidence: 65%

Genetic Structure and Differentiation of Endangered Cycas Species Indicate a Southward Migration Associated with Historical Cooling Events

Yao

Wang

et al. 2023

Diversity

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“…Total DNA was extracted from 30 mg of dried leaf tissue using a LABGENE™ Plant DNA Isolation Kit for Dry Samples (LABGENE Biotechnology Co., Ltd.). A total of three DNA fragments, the ITS and two chloroplast genes matK and ycf1 , were amplified and sequenced using the primer pairs ITS‐1F (5′‐GTA GGT GAA CCT GCA GAA GGA TCA‐3′), 18S‐25S‐3′R (5′‐CCA TGC TTA AAC TCA GCG GGT‐3′; Zhu et al, 2015 ); matK 472F (5′‐CCC RTY CAT CTG GAA ATC TTG GTT C‐3′), matK 1248R (5′‐GCT RTR ATA ATG AGA AAG ATT TCT GC‐3′; Yu et al, 2011 ); and ycf1 F (5′‐CAT GCC GAA GTG ATG GAA AA‐3′), and ycf1 R (5′‐TTT CGA CGA AAA TCT GAT TGT TGC GAA T‐3′; Ding et al, 2020 ; Wang et al, 2022 ). Amplicons were purified using the GENEOUT™ DNA Extraction & Clean Kit following the manufacturer's protocol (GENEOUT Biotechnology Co., Ltd.) and sequenced immediately.…”

Section: Methodsmentioning

confidence: 99%

“…Lineage fusion events can be realized by horizontal gene transfer or hybridization (Niehus et al, 2015 ; Yue, Hu, et al, 2012 ). Mountain‐valley systems, a typical landscape of the Qinling–Hengduan Mountain region, are usually characterized by high mountains and deep valleys, and diverse local environments (Ding et al, 2020 ; Wang et al, 2022 ). If the orientation and morphology of mountain valleys are suitable, valleys and river drainages could serve as corridors for organisms around this area during glacial–interglacial cycles, promoting the occurrence of hybridization events and shaping the population structure of the plants here (Chen et al, 2018 ; Du et al, 2022 ; Yue, Chen, et al, 2012 ; Yue & Sun, 2014 ; Zhang et al, 2011 ).…”

Section: Introductionmentioning

confidence: 99%

Population structure and phylogeography of three closely related tree peonies

Liu,

Xue,

Zhao

et al. 2023

Ecology and Evolution

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Paeonia decomposita, Paeonia rotundiloba, and Paeonia rockii are three closely related species of Sect. Moutan is distributed in the montane area of the Eastern Hengduan Mountain region. Understanding the population history of these three tree peony species could contribute to unraveling the evolutionary patterns of undergrowth species in this hotspot area. We used one nuclear DNA marker (internal transcribed spacer region, ITS) and two chloroplast DNA markers (matK, ycf1) to reconstruct the phylogeographic pattern of the populations. In total, 228 individuals from 17 populations of the three species were analyzed in this study. Three nuclear clades (Clade I -Clade III) and four maternal clades (Clade A -Clade D) were reconstructed. Molecular dating suggested that young lineages diverged during the late Pliocene and earlyPleistocene, younger than the uplift of the Hengduan Mountains but older than the last glacial maximum (LGM). Significant population and phylogeographic structures were detected at both markers. Furthermore, the populations of these tree peonies were overall at equilibrium during the climatic oscillations of the Pleistocene. The simulated palaeoranges of the three species during the LGM period mostly overlapped, which could have led to cross-breeding events. We propose an evolutionary scenario in which mountain orogenesis around the Hengduan Mountain area triggered parapatric isolation between maternal lineages of tree peonies. Subsequent climatic fluctuations drove migration and range recontact of these populations along the valleys. This detailed evolutionary history provides new insights into the phylogeographic pattern of species from mountain-valley systems.

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Haplotype-resolved genome assembly provides insights into the floral scent of Rosa rugosa

Cheng

Da²,

Wang

et al. 2023

Preprint

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Rose is an important aromatic plant and produces flowers that are used in medicine and food. We herein present a haplotype-resolved genome for Rosa rugosacultivar Hanxiang. Analyses of allele-specific expression identified a potential mechanism underlying floral scent biosynthesis. Population genomic analyses involving 133 Rosa accessions elucidated evolutionary histories and a single R. rugosa domestication event. Pathways mediating the synthesis of scent-related metabolites were enriched according to the analyses of the transcriptomes, haplotype variations, and allelic imbalances during the flower development stages of Hanxiang and Guomeigui (R. rugosa accessions with diverse fragrances). The enzyme-encoding ASE genes RrHX1G119800 and RrHX1G204700 (primary amine oxidases) and RrHX2G284700 (L-tryptophan decarboxylase) in the phenylethylamine pathway were tentatively designated as core genes useful for improving 2-phenylethanol production in rose flowers. Our results provide molecular insights into the formation of R. rugosa floral fragrances and genome-level data that are useful for enhancing rose traits via genetic engineering.

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The uplift of the Hengduan Mountains contributed to the speciation of three Rhododendron species

Cited by 4 publications

References 77 publications

Genetic Structure and Differentiation of Endangered Cycas Species Indicate a Southward Migration Associated with Historical Cooling Events

Genetic Structure and Differentiation of Endangered Cycas Species Indicate a Southward Migration Associated with Historical Cooling Events

Population structure and phylogeography of three closely related tree peonies

Haplotype-resolved genome assembly provides insights into the floral scent of Rosa rugosa

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