Phylogenetics and Biogeography of Alnus (Betulaceae) Inferred from Sequences of Nuclear Ribosomal DNA ITS Region

2004 ◽  
Vol 165 (2) ◽  
pp. 325-335 ◽  
Author(s):  
Zhiduan Chen ◽  
Jianhua Li
Keyword(s):  
Ribosomal Dna ◽  
Its Region ◽  
Nuclear Ribosomal Dna

Peucedanum huangshanense (Apiaceae), a new species from Anhui, China

Phytotaxa ◽  
2020 ◽  
Vol 430 (1) ◽  
pp. 17-24
Author(s):  
SHAN-SHAN CHU ◽  
DE-QUN WANG ◽  
HUA-SHENG PENG ◽  
LU-QI HUANG
Keyword(s):  
New Species ◽  
Ribosomal Dna ◽  
Internal Transcribed Spacer ◽  
Its Region ◽  
Distinct Species ◽  
Nuclear Ribosomal Dna ◽  
Phylogenetic Position ◽  
A New Species

Peucedanum huangshanense, a new species discovered in Anhui, China, is illustrated and described. Detailed morphological comparisons have showed that it is similar to P. praeruptorum but differs from the latter by having larger compound umbels (5–14 cm across), rays up to 25, and long-ovoid mericarps with lateral ribs narrowly winged. To explore the phylogenetic position of this species, nuclear ribosomal DNA internal transcribed spacer (ITS) region was sequenced for P. huangshanense and P. praeruptorum collected in different places. The morphological and molecular evidences support the hypothesis that P. huangshanense is a new distinct species.

scholarly journals DNAbased detection of western gall rust

2004 ◽  
Vol 57 ◽  
pp. 146-150 ◽  
Author(s):  
T.D. Ramsfield ◽  
D.R. Vogler
Keyword(s):  
Ribosomal Dna ◽  
Internal Transcribed Spacer ◽  
Rust Fungus ◽  
Its Region ◽  
Pcr Primers ◽  
Host Tissue ◽  
Nuclear Ribosomal Dna ◽  
Infected Host ◽  
The Novel ◽  
Pcr Product

The internal transcribed spacer (ITS) region of the nuclear ribosomal DNA of the western gall rust fungus (Peridermium harknessii) was amplified using the basidiomycetespecific PCR primers ITS1F and ITS4B The PCR product was then sequenced and aligned with other pine stem rust ITS sequences and a conserved region within P harknessii was targeted with the novel PCR primer Phar1 Our PCR protocol was able to differentiate P harknessii from Cronartium comandrae and C coleosporioides and detected P harknessii within infected host tissue However P harknessii was not distinguishable from C quercuum fsp fusiforme The method provides a rapid and sensitive detection protocol for P harknessii and C quercuum fsp fusiforme within infected host tissue

Phylogeny of the genusGoodyera (Orchidaceae; Cranichideae) in Korea based on nuclear ribosomal DNA ITS region sequences

2002 ◽  
Vol 45 (3) ◽  
pp. 182-187 ◽  
Author(s):  
Kee-Sun Shin ◽  
Yong Kook Shin ◽  
Joo-Hwan Kim ◽  
Kyoung-Hwan Tae
Keyword(s):  
Ribosomal Dna ◽  
Its Region ◽  
Nuclear Ribosomal Dna

scholarly journals Teleomorph Formation of Phaeoacremonium aleophilum, Cause of Esca and Grapevine Decline in California

Plant Disease ◽  
2005 ◽  
Vol 89 (2) ◽  
pp. 177-184 ◽  
Author(s):  
S. Rooney-Latham ◽  
A. Eskalen ◽  
W. D. Gubler
Keyword(s):  
Vitis Vinifera ◽  
Ribosomal Dna ◽  
Internal Transcribed Spacer ◽  
Type System ◽  
Its Region ◽  
Wood Chips ◽  
Nuclear Ribosomal Dna ◽  
Mating Types ◽  
Molecular Analyses

Phaeoacremonium is a recently described genus of the hyphomycetes and includes species associated with grapevine (Vitis vinifera) declines worldwide. Spores of Phaeoacremonium spp. have been trapped in infested vineyards, but neither asexual nor sexual fruiting structures have been observed in the field. Mating studies were carried out to determine if California P. aleophilum isolates are capable of forming a teleomorph in vitro. Sterilized grapevine shavings were placed on the surface of water agar plates with pairs of different California isolates of P. aleophilum, an isolate from the holotype of P. aleophilum, plus other related Phaeoacremonium spp. After approximately 28 to 35 days, perithecia were seen forming on wood chips and agar of many pairings. Upon maturation, fertile perithecia had gelatinous droplets of ascospores oozing from their ostioles. Successful crosses, resulting in mature perithecia, corresponded to a heterothallic mating type system. When F1 progeny were backcrossed with their parents, heterothallism was confirmed. Molecular analyses of the internal transcribed spacer (ITS) region of the nuclear ribosomal DNA from ascospore progeny and perithecia confirmed that these perithecia were the teleomorph of P. aleophilum, Togninia minima. Furthermore, 4 months after moist incubating grapevine pieces from naturally infected vineyards, mature perithecia of T. minima could be seen forming on the xylem and pith tissues, suggesting both mating types occur on the same vine.

scholarly journals Identification of species in the genus Nitraria L. (Nitrariaceae) based on nucleotide variability of nuclear ribosomal DNA

2020 ◽  
Vol 24 (5) ◽  
pp. 481-488
Author(s):  
T. A. Poliakova ◽  
E. V. Banaev ◽  
M. A. Tomoshevich
Keyword(s):  
Ribosomal Dna ◽  
Gc Content ◽  
Its Region ◽  
Nuclear Ribosomal Dna ◽  
Nucleotide Polymorphisms ◽  
Nucleotide Substitutions ◽  
Single Nucleotide ◽  
Single Nucleotide Deletion ◽  
Nucleotide Variability ◽  
Its1 And Its2

Intragenomic polymorphism of ITS1 and ITS2 of nuclear ribosomal DNA sequences was analysed in 33 samples belonging to the Nitraria species N. schoberi, N. sibirica, and N. komarovii. The nucleotide variability of the ITS region was detected in the Nitraria species as single-nucleotide substitutions (mainly transitions) and single-nucleotide deletion. Information about the nucleotide variability of fragments is given for the first time by us. The ITS1-5.8S-ITS2 region contained 17 phylogenetically informative single-nucleotide polymorphisms. Eleven single-nucleotide substitutions (transitions, C/T) were detected in ITS1. The ITS2 spacer contained 273–274 bp and was more conservative. A total of 5 phylogenetically informative single-nucleotide polymorphisms (4 transitions: C/T, G/A, one transversion: G/C), one single-nucleotide deletion (T/–) were detected in ITS2. The average GC content was 61.5 %. The GC content was lower in N. sibirica (59.2 %) than in N. schoberi and N. komarovii (62.7 %). It has been shown that the shorter ITS2 is a suitable molecular marker separating these species, due to the low interspecific variability and simultaneous available intraspecific variability. Phylogenetic ML and BI trees constructed separately for the ITS1 and ITS2 spacers, as well as separately for the full-size ITS region and the ITS2 spacer, were congruent. The results obtained on the intraspecific differentiation of N. sibirica revealed two main ribotypes among the samples of this species: the main Siberian sibirica-ribotype and the main Kazakh sibiricaribotype. Geographical features of the distribution of N. sibirica ribotypes, as well as the presence of significant differences between the main Siberian and Kazakh sibirica-ribotypes (3 single-nucleotide substitutions) indicated significant inter-population differences and taxonomic heterogeneity of N. sibirica. Most likely, the processes of homogenization of nuclear ribosomal DNA of N. sibirica samples, the origin of which is associated with hybridization and speciation, are currently continuing.

A molecular phylogeny of the grass family (Poaceae) based on the sequences of nuclear ribosomal DNA (ITS)

1998 ◽  
Vol 11 (6) ◽  
pp. 667 ◽  
Author(s):  
C. Hsiao ◽  
S. W. L. Jacobs ◽  
N. J. Chatterton ◽  
K. H. Asay
Keyword(s):  
Ribosomal Dna ◽  
Internal Transcribed Spacer ◽  
C4 Photosynthesis ◽  
Its Region ◽  
Nuclear Ribosomal Dna ◽  
Plate Tectonic ◽  
Its Phylogeny ◽  
The Core ◽  
Grass Family ◽  
Fossil Records

Phylogenetic relationships of the grass family inferred from the sequences of the internal transcribed spacer (ITS) region of the nuclear ribosomal DNA (rDNA) are generally in accord with the boundaries of the six commonly recognised subfamilies: Bambusoideae, Pooideae, Arundinoideae, Centothecoideae, Chloridoideae and Panicoideae. ITS phylogeny recognises the herbaceous bamboo allies, Streptochaeta and Pharus, as the basal taxa to all grasses. The core grass lineage is resolved into three major clades: the basal Bambusoideae is sister to the monophyletic Pooideae and the Panicoideae–Arundinoideae–Centothecoideae–Chloridoideae (PACC) clade. Several genera with uncertain taxonomic affinities, Lygeum, Nardus, Brachyelytrum, Diarrhena, Anisopogon, Ampelodesmos, and the tribe Stipeae, are all clustered with a broadly defined Pooideae, and may be the ‘missing links’ between the Pooideae and the Bambusoideae. Relationships of the PACC clade indicate that C4 photosynthesis evolved independently among and within the PACC subfamilies. ITS phylogeny of the grass family, and evidence from the chloroplast genome, cytogenetics, fossil records, biogeography, and plate tectonic theory, suggest that the origin of the grasses is probably ‘out of South America’.

Phylogeny of Sisymbrium (Brassicaceae) based on ITS sequences of nuclear ribosomal DNA

2002 ◽  
Vol 80 (9) ◽  
pp. 1002-1017 ◽  
Author(s):  
Suzanne I Warwick ◽  
Ihsan A Al-Shehbaz ◽  
Robert A Price ◽  
Connie Sauder
Keyword(s):  
Ribosomal Dna ◽  
New World ◽  
Sequence Data ◽  
Its Region ◽  
Internal Transcribed Spacers ◽  
Nuclear Ribosomal Dna ◽  
Maximum Parsimony Analysis ◽  
Rrna Gene ◽  
Old World ◽  
5.8S Rrna Gene

The genus Sisymbrium as currently circumscribed includes about 94 species disjunctly distributed in the Old (41 spp.) and the New World (53 spp.). Sisymbrium has been variously delimited, with several segregate genera proposed (subtribe Sisymbriinae) primarily for the new World taxa, including Schoenocrambe, Coelophragmus, and Mostacillastrum. Using sequence data from the internal transcribed spacers of nuclear ribosomal DNA and the 5.8S rRNA gene (collectively, ITS region), we examined the evolutionary relationships of Old and New World Sisymbrium species with its segregate genera and the validity of O.E. Schulz's classical sectional treatment of Sisymbrium. Sequence data were obtained from 33 Sisymbrium species, representing all 14 sections and two Sisymbrium species formerly assigned to segregate genera Coelophragmus and Mostacillastrum (subtribe Sisymbriinae), and two putative Sisymbrium species currently assigned to Neotorularia. Sequence data were also obtained from 26 taxa from segregate or related genera includingSchoenocrambe, Werdermannia (subtribe Sisymbriinae), eight genera in the Thelypodieae, Sibara (tribe Arabideae) and Pringlea (tribe Pringleeae), four members of the tribe Brassiceae, and three other Neotorularia species. Results from maximum parsimony analysis showed a polyphyletic origin for Sisymbrium and did not correspond well to Schulz's sectional classification. Sisymbrium species were split into three major clades: Old World Sisymbrium (including Neotorularia aculeolata, Neotorularia afghanica, and the type species of Schoenocrambe, Schoenocrambe linifolia, the sole New World member of this Old World clade); New World Sisymbrium (along with the remaining New World taxa) and designated as the New World Thelypodieae alliance; and the tribe Brassiceae ( including Sisymbrium supinum and Sisymbrium thellungii).Key words: Sisymbrium, Schoenocrambe, ITS, Thelypodieae, taxonomy, Brassicaceae.

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