Karyotype analysis of the<i>Calligonum mongolicum</i>complex (Polygonaceae) from Northwest China

Shi, Wei; Pan, Bo‐Rong

doi:10.1080/00087114.2015.1032572

Cited by 4 publications

(10 citation statements)

References 16 publications

(17 reference statements)

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“…Our study showed that Calligonum ebinuricum possesses highly distinct nrITS sequences (Figures 3 & 4); yet the ITS and ETS sequences of the Calligonum mongolicum complex generated a topology with the species of the complex highly intermixed with each other in the tree. The authors’ results both in this paper and in their previous studies (Shi et al 2011, 2012, 2013, 2016, Shi and Pan 2015) argue for the merging of Calligonum chinense , Calligonum gobicum , Calligonum pumilum and Calligonum zaidamense with Calligonum mongolicum as proposed by Soskov (1975a, 1975b). Detailed evidence was also recently presented on merging Calligonum pumilum with the more widespread Calligonum mongolicum (Shi et al 2016).…”

Section: Discussionsupporting

confidence: 64%

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Reproductive biology and variation of nuclear ribosomal ITS and ETS sequences in the Calligonum mongolicum complex (Polygonaceae)

Shi¹,

Wen²,

Zhao³

et al. 2017

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To explore the biosystematics of the Calligonum mongolicum complex (Polygonaceae), the flowering phenological period, breeding and pollination characters and seed set of the complex (Calligonum Mongolicum Turze, Calligonum chinense A. Los., Calligonum gobicum A. Los., Calligonum pumilum A. Los. and Calligonum zaidamense A. Los.) were documented in the Turpan Eremophyte Botanical Garden, China. The sequences of the nuclear ribosomal ITS and ETS region were employed to differentiate the Calligonum mongolicum complex and other species in sect. Medusae. The results showed species of the Calligonum mongolicum complex occupied overlapping flowering periods and had consistent pollination agents. Their breeding systems are all self-compatible, tend to be out-crossing and they interbreed amongst each other (out-crossing index, OCI = 4).The crosses within and amongst species had high seed sets (44 - 65%). Phylogenetic analyses of Calligonum sect. Medusae and the network analysis of nrDNA (ITS and ETS) in the complex suggest interbreeding amongst “species” within the complex and provide evidence for taxonomically merging the five species in the complex. The detected hybridisation, occurring within the complex, suggests the need to improve traditional methods of ex situ plant conservation in botanical gardens for maintaining genetic diversity of Calligonum within and amongst species from different geographic areas.

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Section: Discussionsupporting

confidence: 64%

“…The situation is markedly different in other species of the Calligonum sect. Medusae which are polyploids with the most frequent chromosome number 2 n (4 x or 6 x ) = 36 or 54 (Wang and Yang 1985; Wang and Guan 1986; Shi and Pan 2015). The above chromosomal data indicate the significant role of polyploidy in the evolution of the sect.…”

Section: Introductionmentioning

confidence: 99%

Reproductive biology and variation of nuclear ribosomal ITS and ETS sequences in the Calligonum mongolicum complex (Polygonaceae)

Shi¹,

Wen²,

Zhao³

et al. 2017

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“…Pterococcus) has a complex fruit morphology and can be tetraploid or hexaploid within a narrow distribution (Kong et al 2016), which also caused their taxomonical challenges in the past (Soskov 1975a;Bao & Grabovskaya-Borodina 2003;Soskov 2011). Thus, the karyotypes also gave the evidences in its complex biosystematics (Soskov 1975b;Wang & Yang 1985;Wang & Guan 1986;Shi et al 2009;Shi & Pan 2015). Polyploidy in Calligonum is also likely to have arisen independently multiple times, such as in C. caput-medusae (2n = 6x = 54) and C. arborescens (2n = 4x = 36) of Sect.…”

Section: Introductionmentioning

confidence: 97%

A phylogeny of Calligonum L. (Polygonaceae) yields challenges to current taxonomic classifications

et al. 2021

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Calligonum is the only C 4 genus within Polygonaceae. We applied DNA sequences from the nuclear ribosomal internal transcribed spacer (nrITS) and five plastid genome regions (psbA-trnH, ycf6-psbM, trnL-F, rpl32-trnL and rbcL) to reconstruct the phylogeny of Calligonum. The nrITS and the combined plastid DNA regions were analysed separately. The phylogeny of the five plastid genome regions supports the treatment of the Calligonum mongolicum complex as a single species with intra-specific geographic structure, and suggests independent hybrid origins for the polyploid species C. caput-medusae and C. arborescens through comparisons with the nrITS tree. We detected phylogenetic incongruence between the nrITS and plastid DNA trees and hypothesized reticulate evolution or hybrid speciation in the genus. Divergence time dating based on nrITS determined that the most recent common ancestor of Calligonum species began diversification 3.46 million years ago [mya; 95 % high probability density (HPD): 1.87-5.71 mya], and diversification began in the Central Asia and China clade ca. 2.68 mya (95 % HPD: 1.28-4.59 mya). We expect that future studies employing next generation sequencing methods, such as RAD-seq, coupled with denser interand intra-specific taxonomic sampling, may prove to be cost-effective methods for further investigation of the evolutionary history of this genus.

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“…The most widely distributed species in Central Asia, C. mongolicum (sect. Medusa), has shown two karyotypes with different chromosome numbers (2 n = 18 and 2 n = 27) within the same population (Shi and Pan 2015); this species has heterogeneous phenotypes and forms a C. mongolicum complex with inter-crossed taxonomic relationships with other species in sect. Medusa (Soskov 2011; Shi et al 2011, 2012; Shi and Pan 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Medusa), has shown two karyotypes with different chromosome numbers (2 n = 18 and 2 n = 27) within the same population (Shi and Pan 2015); this species has heterogeneous phenotypes and forms a C. mongolicum complex with inter-crossed taxonomic relationships with other species in sect. Medusa (Soskov 2011; Shi et al 2011, 2012; Shi and Pan 2015). Calligonum mongolicum has a large distribution area bordered by Xilinhot (Inner Mongolia) in the east, Kumul and Tutotu Basin (Xinjiang) in the west, Milan (Xinjiang) in the south, and Baitashan, Qitai, and Karamay (Xinjiang) in the north.…”

Section: Introductionmentioning

confidence: 99%

New morphological and DNA evidence supports the existence of Calligonum jeminaicum Z. M. Mao (Calligoneae, Polygonaceae) in China

Shi¹,

Liu²,

Wen³

et al. 2019

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Calligonum jeminaicum Z. M. Mao, a species regarded as endemic to China, was thought to be nonexistent owing to a lack of scientific records. The similarity of C. jeminaicum to C. mongolicum Turcz. warranted an investigation into the taxonomical relationship between these species. In this study, a naturally occurring population of C. jeminaicum was discovered and the taxonomical relationships of this species with C. mongolicum were resolved. Morphological traits, including fruit and flower characteristics, as well as nuclear (ETS, ITS) and chloroplast (psbA-trnH, ycf6-psbM, rpl32-trnL, rbcL, and trnL-F) DNA sequence data were studied to confirm the taxonomic status of C. jeminaicum. The nrDNA data (ITS1-2 and ETS) from C. jeminaicum reflected variability from the whole C. mongolicum complex, showing distinctive haplotypes in the Calligonum sect. Medusa Sosk. & Alexandr. The cpDNA data supplied similar evidence, showing unique branching in Bayesian and ML tree analyses. The specific status of C. jeminaicum is confirmed based on both morphological and molecular analyses. Here we present a revised description of C. jeminaicum along with its DNA barcode and discuss suggestions for the conservation of this species. Based on current evidence, this species was evaluated as Critically Endangered (CR) according to the IUCN criteria.

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Karyotype analysis of theCalligonum mongolicumcomplex (Polygonaceae) from Northwest China

Cited by 4 publications

References 16 publications

Reproductive biology and variation of nuclear ribosomal ITS and ETS sequences in the Calligonum mongolicum complex (Polygonaceae)

Reproductive biology and variation of nuclear ribosomal ITS and ETS sequences in the Calligonum mongolicum complex (Polygonaceae)

A phylogeny of Calligonum L. (Polygonaceae) yields challenges to current taxonomic classifications

New morphological and DNA evidence supports the existence of Calligonum jeminaicum Z. M. Mao (Calligoneae, Polygonaceae) in China

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