scholarly journals Molecular identification of Rosa x damascena growing in Taif region (Saudi Arabia)

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Sayed Amer ◽  
Salih A. Basaid ◽  
Esmat Ali
Keyword(s):  
Saudi Arabia ◽  
Maximum Likelihood ◽  
Genetic Distance ◽  
Molecular Identification ◽  
Maximum Parsimony ◽  
Rooted Tree ◽  
Tree Topology ◽  
Neighbor Joining ◽  
Likelihood Methods ◽  
Maximum Likelihood Methods

A fragment of 772 bp of the chloroplast maturase K gene was amplified and sequenced for <em>Rosa x damascena trigintipetala</em> variety growing in Taif region of Saudi Arabia. The data were aligned with their counterparts of other varieties already found in the Genbank database and were analyzed by maximum-parsimony, neighbor-joining and maximum-likelihood methods and a single rooted tree was executed. <em>R. x damascena trigintipetala</em> was paraphyletic where one sample [A] clustered with all varieties while the second [B] was basal. <em>R. x damascena</em> was sister to <em>R. x chinensis semperflorens</em> with the later being basal. <em>R. x damascena gori</em> was basal for all taxa studied. <em>R. moschata</em> was inside the clade of <em>R. x damascena</em>. Hybridization could be possible among <em>R. damascena, R. chinensis</em> and <em>R. moschata</em>. The genetic distance and tree topology indicated that [A] variety could be originated from <em>R. moshata</em> while [B] could be originated from gori or <em>R. chinensis semperflorens</em>. We, therefore, may consider that <em>R. x damascena gori</em> or <em>R. chinensis</em> could be the origin of all nowadays <em>R. x damascena</em> varieties.

Towards a monophyletic classification of Lejeuneaceae I: subtribe Leptolejeuneinae subtr. nov.

Phytotaxa ◽  
2014 ◽  
Vol 156 (3) ◽  
pp. 165 ◽  
Author(s):  
JOCHEN HEINRICHS ◽  
ALFONS SCHÄFER-VERWIMP ◽  
ALEKSANDRA CZUMAY ◽  
SHANSHAN DONG ◽  
ARMIN SCHEBEN ◽  
...  
Keyword(s):  
Maximum Likelihood ◽  
Maximum Parsimony ◽  
Its Region ◽  
Bootstrap Support ◽  
Phylogenetic Position ◽  
Likelihood Methods ◽  
Monophyletic Lineage ◽  
Current Classification ◽  
Maximum Likelihood Methods

We employed sequences of two chloroplast regions (trnL-trnF, rbcL) and the nuclear ribosomal ITS region of seven accessions of Leptolejeunea to explore its phylogenetic position. Maximum parsimony and maximum likelihood analyses led to similar topologies but deeper nodes received good bootstrap support only with maximum likelihood methods. Leptolejeunea formed an early diverging, robust monophyletic lineage within Lejeuneaceae tribe Lejeuneeae. Contrary to earlier belief, it is not closely related to Drepanolejeunea. To amend the current classification of Lejeuneeae into subtribes, we propose Leptolejeuneinae, subtr. nov.

scholarly journals Four new epiphytic species in the Micarea prasina group from Europe

2019 ◽  
Vol 51 (1) ◽  
pp. 7-25 ◽  
Author(s):  
Annina LAUNIS ◽  
Juha PYKÄLÄ ◽  
Pieter VAN DEN BOOM ◽  
Emmanuël SÉRUSIAUX ◽  
Leena MYLLYS
Keyword(s):  
New Species ◽  
Maximum Likelihood ◽  
Maximum Parsimony ◽  
Novel Species ◽  
Species Level ◽  
Likelihood Methods ◽  
Maximum Likelihood Methods ◽  
Group A ◽  
Pale Green ◽  
Olive Green

AbstractIn this study we clarify the phylogeny and reassess the current taxonomy of the Micarea prasina group, focusing especially on the M. byssacea and M. micrococca complexes. The phylogeny was investigated using ITS, mtSSU and Mcm7 regions from 25 taxa belonging to the M. prasina group. A total of 107 new sequences were generated. Data were analyzed using maximum parsimony and maximum likelihood methods. The results reveal five undescribed well-supported lineages. Four of the lineages represent new species described as Micarea pseudomicrococca Launis & Myllys sp. nov., M. czarnotae Launis, van den Boom, Sérusiaux & Myllys sp. nov., M. microareolata Launis, Pykälä & Myllys sp. nov. and M. laeta Launis & Myllys sp. nov. In addition, a fifth lineage was revealed that requires further study. Micarea pseudomicrococca is characterized by an olive green granular thallus, small cream-white or brownish apothecia lacking the Sedifolia-grey pigment and two types of paraphyses up to 2 µm wide. Micarea czarnotae forms a granular, densely granular or continuous olive green thallus, convex to hemispherical apothecia often with the Sedifolia-grey pigment and no crystalline granules in the thallus. Micarea microareolata is characterized by a ± pale green areolate thallus (composed of goniocysts), cream-white apothecia lacking the Sedifolia-grey pigment and narrow spores. Micarea laeta has a vivid to olive green granular thallus, pale apothecia lacking the Sedifolia-grey pigment and wider spores compared to M. microareolata. Descriptions, images and a key are provided for the new species. Crystalline granules are introduced as a novel species-level character for Micarea.

scholarly journals Selecting between causal and noncausal models with quantile autoregressions

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Alain Hecq ◽  
Li Sun
Keyword(s):  
Time Series ◽  
Maximum Likelihood ◽  
Latin American ◽  
Financial Time Series ◽  
Selection Criterion ◽  
Likelihood Methods ◽  
Approximate Maximum Likelihood ◽  
Financial Time ◽  
Maximum Likelihood Methods ◽  
Latin American Countries

AbstractWe propose a model selection criterion to detect purely causal from purely noncausal models in the framework of quantile autoregressions (QAR). We also present asymptotics for the i.i.d. case with regularly varying distributed innovations in QAR. This new modelling perspective is appealing for investigating the presence of bubbles in economic and financial time series, and is an alternative to approximate maximum likelihood methods. We illustrate our analysis using hyperinflation episodes of Latin American countries.

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