Variability of the ITS1-5.8S rDNA-ITS2 sequence during the divergence of sweet-grass species (Glyceria R. Br.)

Rodionov, A. V.; Kotsinyan, Armen; Gnutikov, A. A.; Dobroradova, Marina A; Мачс, Э. М.

doi:10.1134/s2079059713020068

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…Meliceae, with stem and crown dates of 38.92 and 30.03 Ma, has seven genera [Glyceria R.Br. (48 spp., worldwide;Whipple et al, 2007;Rodionov et al, 2013), Koordersiochloa Merr. (2 spp., low latitudes of Africa, India, Philippines, and Indonesia; Veldkamp, 2012), is perhaps sister to the rest of the tribe (Hochbach et al, 2015); Lycochloa Samuelsson (1 sp., Lebanon and Syria); Melica L. (92 spp., worldwide; Hempel, 2004Hempel, , 2012; Pleuropogon R.Br.…”

Section: Pooideae (Rs)mentioning

confidence: 99%

Grasses through space and time: An overview of the biogeographical and macroevolutionary history of Poaceae

Gallaher

Peterson

Soreng

et al. 2022

J of Sytematics Evolution

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Grasses are widespread on every continent and are found in all terrestrial biomes. The dominance and spread of grasses and grassland ecosystems have led to significant changes in Earth′s climate, geochemistry, and biodiversity. The abundance of DNA sequence data, particularly chloroplast sequences, and advances in placing grass fossils within the family allows for a reappraisal of the family′s origins, timing, and geographic spread and the factors that have promoted diversification. We reconstructed a time‐calibrated grass phylogeny and inferred ancestral areas using chloroplast DNA sequences from nearly 90% of extant grass genera. With a few notable exceptions, the phylogeny is well resolved to the subtribal level. The family began to diversify in the Early–Late Cretaceous (crown age of 98.54 Ma) on West Gondwana before the complete split between Africa and South America. Vicariance from the splitting of Gondwana may be responsible for the initial divergence in the family. However, Africa clearly served as the center of origin for much of the early diversification of the family. With this phylogenetic, temporal, and spatial framework, we review the evolution and biogeography of the family with the aim to facilitate the testing of biogeographical hypotheses about its origins, evolutionary tempo, and diversification. The current classification of the family is discussed with an extensive review of the extant diversity and distribution of species, molecular and morphological evidence supporting the current classification scheme, and the evidence informing our understanding of the biogeographical history of the family.

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Section: Pooideae (Rs)mentioning

confidence: 99%

Grasses through space and time: An overview of the biogeographical and macroevolutionary history of Poaceae

Gallaher

Peterson

Soreng

et al. 2022

J of Sytematics Evolution

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“…The tribes Meliceae, Brylkinieae, Phaenospermateae, Stipeae and Ampelodesmeae are the next emerging branches in the phylogeny. Brylkinieae has been included only in a few analyses, where it has been placed as the sister group of Meliceae ( Schneider et al 2009 , 2011 ; Davis and Soreng 2010 ; Romaschenko et al 2010 , 2012 ; Rodionov et al 2013 ; Blaner et al 2014 ). The monotypic Ampelodesmos ( A. mauritanicus ) [= Ampelodesmeae] has consistently been nested in Stipeae in plastid and nuclear ribosomal analyses ( Hsiao et al 1998 ; Davis and Soreng 2007 , 2010 ; Grass Phylogeny Working Group II 2012 ; Romaschenko et al 2012 ), although it differs dramatically in spikelet morphology, being multi-flowered rather than single-flowered like Stipeae.…”

Section: Introductionmentioning

confidence: 99%

Plastid phylogenomics of the cool-season grass subfamily: clarification of relationships among early-diverging tribes

et al. 2015

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Whole plastid genomes (plastomes) are being sequenced rapidly from across the green plant tree of life, and phylogenetic analyses of these are increasing resolution and support for relationships that were unresolved in earlier studies. The cool-season grass subfamily, Pooideae, includes important temperate cereals, turf grasses and forage species, yet some aspects of deep phylogeny in the lineage are unresolved. We newly sequenced 25 Pooideae plastomes, and conducted phylogenomic analyses of these and 20 existing plastomes from the subfamily. Most aspects of deep relationship in Pooideae are maximally supported in our analyses, including those among early-diverging tribes.

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“…P. ginseng was reported to be a natural polyploid, with two polyploidization events occurring during the evolution of this plant, allotetraploid origination, and chromosome numbers 2n = 24, 44, and 48 [ 14 , 38 , 39 ]. Moreover, different ancestral genomes can be developed at different rates [ 40 ], and different ginseng cultivars have no variation in the number of rDNA loci and which possess only one locus for each 5S and 45S rDNA [ 41 ].…”

Section: Discussionmentioning

confidence: 99%

Age-Dependent and Tissue-Specific Alterations in the rDNA Clusters of the Panax ginseng C. A. Meyer Cultivated Cell Lines

et al. 2020

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Long-term cultivation of Panax ginseng cell lines leads to a decreasing synthesis of the biologically active substances used in traditional medicine. To gain insight into the cellular mechanisms which may influence this process, we analyzed variations within the rDNA cluster of the Oriental ginseng cell lines. The cell lines were cultivated for 6 and 24 years; the number of nucleoli and chromosomes was analyzed. The complete 18S rDNA sequences were cloned and sequenced. The nucleotide polymorphism and phylogenetic relations of the sequences were analyzed, and the secondary structures for separate 18S rRNA regions were modeled. The 18S rDNA accumulated mutations during cell cultivation that correlate well with an increase in the number of chromosomes and nucleoli. The patterns of nucleotide diversity are culture-specific and the increasing polymorphism associates with cytosine methylation sites. The secondary structures of some 18S rRNA regions and their interaction can alter during cultivation. The phylogenetic tree topologies are particular for each cell line.The observed alterations in rDNA clusters are associated with a somaclonal variation, leading to changes in the pattern of intracellular synthesis during cell cultivation. The identified divergent rRNAs could provide additional gene expression regulation in P. ginseng cells by forming heterogeneous ribosomes.

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Variability of the ITS1-5.8S rDNA-ITS2 sequence during the divergence of sweet-grass species (Glyceria R. Br.)

Cited by 6 publications

References 14 publications

Grasses through space and time: An overview of the biogeographical and macroevolutionary history of Poaceae

Grasses through space and time: An overview of the biogeographical and macroevolutionary history of Poaceae

Plastid phylogenomics of the cool-season grass subfamily: clarification of relationships among early-diverging tribes

Age-Dependent and Tissue-Specific Alterations in the rDNA Clusters of the Panax ginseng C. A. Meyer Cultivated Cell Lines

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