Molecular Phylogeny of Tribe Theeae (Theaceae s.s.) and Its Implications for Generic Delimitation

Zhang, Wei; Kan, Shenglong; Zhao, Hong; Li, Zhenyu; Wang, Xiaoquan

doi:10.1371/journal.pone.0098133

Cited by 27 publications

(28 citation statements)

References 50 publications

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“…The nrDNA internal transcribed spacer (ITS) region and chloroplast DNA have higher variability and are thus suitable for classifying lower taxonomic levels [ 24 , 25 , 26 ]. Accordingly, these regions are useful for inferring phylogenetic relationships at lower taxonomic levels and have been successfully used to analyze plant systematics [ 27 , 28 ]. Here we selected three cpDNA termed the rbc L gene, mat K gene and trn L-F gene and one nrDNA ITS to study the interspecific relationships [ 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Interspecific Phylogenic Relationships within Genus Melilotus Based on Nuclear and Chloroplast DNA

Duan

Luo

et al. 2015

PLoS ONE

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Melilotus comprises 19 species, while the phylogenetic relationships between species remain unclear. In the present work, three chloroplast genes, rbcL, matK, trnL-F, and one nuclear region, ITS (internal transcribed spacer) belonging to 48 populations of 18 species of Melilotus were sequenced and phylogenetic trees were constructed to study their interspecific relationships. Based on the phylogenetic tree generated in this study using rbcL analysis, the Melilotus genus is clearly monophyletic in the legume family. Both Bayesian and maximum-parsimony approaches were used to analyze the data. The nrDNA ITS provided more informative characteristics (9.8%) than cpDNA (3.0%). Melilotus contains two closely related groups, clade I and clade II. M. spicatus, M. indicus and M. segetalis have a close relationship. M. infestus, M. siculus and M. sulcatus are closely related. The comparing between molecular phylogeny and flower color classification in Melilotus showed that the flower color is not much informative for phylogenetics of this genus.

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Section: Introductionmentioning

confidence: 99%

Interspecific Phylogenic Relationships within Genus Melilotus Based on Nuclear and Chloroplast DNA

Duan

Luo

et al. 2015

PLoS ONE

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“…Theeae is the most diverse of these tribes and contains Camellia, Polyspora, Pyrenaria, Apterosperma, and Laplacea. A recent molecular phylogenetic analysis of Theeae indicated that Camellia and Pyrenaria form a paraphyletic group; these two occur and hybridize naturally with each other (Zhang et al, 2014). Gordoniae and Stewartiae belong to the sister clade of Theeae.…”

Section: Taxonomy/systematicsmentioning

confidence: 99%

Cytogenetics, Ploidy, and Genome Sizes of Camellia and Related Genera

Hembree¹,

Ranney²,

Jackson³

et al. 2019

horts

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Camellia L., the most speciose member of the diverse tea family Theaceae, has a long and complex horticultural history. Extensive cultivation and hybridization have produced thousands of varieties of Camellia, including commercially important crops such as cultivated tea, oilseed, and iconic flowering shrubs. Cytogenetics of Camellia and related genera is complicated; chromosome number and ploidy can vary widely between species, and interspecific and interploid hybridization occurs. However, specific information regarding cytogenetics of many species, cultivars, and modern hybrids is lacking. The objectives of this study were to compile a consolidated literature review of the cytogenetics of Camellia and related genera and to determine chromosome numbers, ploidy, and genome sizes of specific accessions of selected species, cultivars, and interspecific and interploid hybrids. A review of the existing literature regarding Theaceae cytogenetics is presented as a consolidated reference comprising 362 taxa. Genome sizes were determined with flow cytometry using propidium iodide as a fluorochrome and Pisum sativum ‘Ctirad' and Magnolia virginiana ‘Jim Wilson’ as internal standards. Chromosome numbers of selected taxa were determined using traditional cytology and were used to calibrate genome sizes with ploidy level. Our results confirmed a base chromosome number of x = 15 for Theeae including Camellia, x = 17 for Stewartiae, and x = 18 for Gordoniae. Surveyed camellias ranged from 2n = 2x = 30 to 2n = 8x = 120, including diploids, triploids, tetraploids, pentaploids, hexaploids, and octoploids. Previously uncharacterized taxa such as Camellia azalea, C. amplexicaulis, C. chrysanthoides, C. cordifolia, C. cucphuongensis, C. flava, C. nanyongensis, and C. trichoclada were found to be diploid. Ploidy was also newly determined for Schima argentea, S. khasiana, S. remotiserrata, and S. sinensis (all diploids). Both diploid and triploid Stewartia ovata were found, and a ploidy series was discovered for Polyspora that ranged from diploid to octoploid. Ploidy determinations were used to confirm or challenge the validity of putative interploid hybrids. Monoploid genome sizes varied among subfamily and genera, with 1Cx values ranging from 0.80 pg for Franklinia to a mean of 3.13 pg for Camellia, demonstrating differential rates of genome expansion independent of ploidy. Within Camellia, monoploid genome sizes varied among subgenera, sections, and some species (range, 2.70–3.55 pg). This study provides a consolidated and expanded knowledgebase of ploidy, genome sizes, hybridity, and reproductive pathways for specific accessions of Camellia and related genera that will enhance opportunities and strategies for future breeding and improvement within Theaceae.

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“…Additional fossil evidence, however, is required to show the validity of this suggestion. The molecular dating of diversification events within the tribe Theeae (Zhang et al 2014) used the fruits and seeds of Andrewsiocarpon henryense Grote et Dilcher from the middle Eocene Claiborne Formation of western Kentucky and Tennessee, USA (Grote and Dilcher 1989) and wood of Camellia japonoxyla from the lower Miocene Yanagida Formation of Japan (Suzuki and Terada 1996) for calibration and estimated the time of Camellia radiation as ca. 22 Ma, i.e.…”

Section: Phytogeographical Implicationsmentioning

confidence: 99%

Camellia nanningensis sp. nov.: the earliest fossil wood record of the genus Camellia (Theaceae) from East Asia

et al. 2016

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A new species Camellia nanningensis was described on the basis of well-preserved mummified wood from the upper Oligocene Yongning Formation of Nanning Basin in Guangxi Province, South China. This represents the most ancient fossil wood assigned to Camellia, and the earliest fossil record of the family Theaceae in China. This fossil material shows that Camellia occurred in China as early as the late Oligocene, suggesting more ancient radiation of this genus than estimated by molecular dating.

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Molecular Phylogeny of Tribe Theeae (Theaceae s.s.) and Its Implications for Generic Delimitation

Cited by 27 publications

References 50 publications

Interspecific Phylogenic Relationships within Genus Melilotus Based on Nuclear and Chloroplast DNA

Interspecific Phylogenic Relationships within Genus Melilotus Based on Nuclear and Chloroplast DNA

Cytogenetics, Ploidy, and Genome Sizes of Camellia and Related Genera

Camellia nanningensis sp. nov.: the earliest fossil wood record of the genus Camellia (Theaceae) from East Asia

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