scholarly journals MediterraneanLithophyllum stictiforme(Corallinales, Rhodophyta) is a genetically diverse species complex: implications for species circumscription, biogeography and conservation of coralligenous habitats

2019 ◽  
Vol 55 (2) ◽  
pp. 473-492 ◽  
Author(s):  
Laura Pezzolesi ◽  
Viviana Peña ◽  
Line Le Gall ◽  
Paul W. Gabrielson ◽  
Sara Kaleb ◽  
...  
Keyword(s):  
Species Complex ◽  
Species Circumscription ◽  
Diverse Species

Species circumscription of the Caltha leptosepala polyploid complex (Ranunculaceae) based on molecular and morphological data

Phytotaxa ◽  
2017 ◽  
Vol 316 (3) ◽  
pp. 201 ◽  
Author(s):  
KEIR M. WEFFERLING ◽  
SARA B. HOOT
Keyword(s):  
Species Complex ◽  
Morphological Characters ◽  
Title Page ◽  
Morphological Data ◽  
Polyploid Complex ◽  
Species Circumscription ◽  
Dichotomous Key ◽  
Field Identification ◽  
Geographic Data

The Caltha leptosepala species complex (Ranunculaceae) is taxonomically unresolved, with authors of various regional floras recognizing different names and numbers of species. Integrating molecular, morphological, cytological, and geographic data, we describe three species in the complex, restoring two species names, C. biflora and C. chionophila, in addition to recognizing C. leptosepala. Based on chloroplast and nuclear ribosomal phylogenies, we illustrate key morphological synapomorphies for the three Caltha species, assess the usefulness of previously used morphological characters, and provide a dichotomous key for their field identification. A neotype is designated for C. leptosepala var. howellii because the originals were lost or destroyed.

The world’s economically most important chelonians represent a diverse species complex (Testudines: Trionychidae: Pelodiscus)

2010 ◽  
Vol 10 (3) ◽  
pp. 227-242 ◽  
Author(s):  
Uwe Fritz ◽  
Shiping Gong ◽  
Markus Auer ◽  
Gerald Kuchling ◽  
Norbert Schneeweiß ◽  
...  
Keyword(s):  
Species Complex ◽  
Diverse Species

Genista anglica (Fabaceae): One very diverse species or one species complex?

2016 ◽  
Vol 129 (3) ◽  
pp. 411-422 ◽  
Author(s):  
José A. Fernández Prieto ◽  
Mauro Sanna ◽  
Álvaro Bueno ◽  
Marta Pérez
Keyword(s):  
Species Complex ◽  
Diverse Species

scholarly journals Phytopathogen Genome Announcement: Draft Genome Sequences of 62 Pseudomonas syringae Type and Pathotype Strains

2016 ◽  
Vol 29 (4) ◽  
pp. 243-246 ◽  
Author(s):  
Shalabh Thakur ◽  
Bevan S. Weir ◽  
David S. Guttman
Keyword(s):  
Host Specificity ◽  
Pseudomonas Syringae ◽  
Species Complex ◽  
Draft Genome ◽  
Genome Sequences ◽  
Diverse Species ◽  
Important Crop ◽  
Genomic Basis

Pseudomonas syringae is a diverse species-complex that includes many important crop pathogens. Here, we report the draft genomes of 62 type and pathotype strains, which provide a genomic reference for the diversity of this species complex and will contribute to the elucidation of the genomic basis of pathogenicity and host specificity.

Identification of sibling species in the genus Eucyclops from water-bodies of Ukraine and Russia using crossbreeding studies

2014 ◽  
Vol 25 (1-2) ◽  
pp. 61-68 ◽  
Author(s):  
V. I. Monchenko ◽  
L. P. Gaponova ◽  
V. R. Alekseev
Keyword(s):  
Cryptic Species ◽  
River Basin ◽  
Black Sea ◽  
Species Complex ◽  
River Basins ◽  
Water Bodies ◽  
Similar Species ◽  
Basin Water ◽  
Different Populations ◽  
Baltic Sea Basin

Crossbreeding experiments were used to estimate cryptic species in water bodies of Ukraine and Russia because the most useful criterion in species independence is reproductive isolation. The problem of cryptic species in the genus Eucyclops was examined using interpopulation crosses of populations collected from Baltic Sea basin (pond of Strelka river basin) and Black Sea basin (water-reservoires of Dnieper, Dniester and Danube rivers basins). The results of reciprocal crosses in Eucyclops serrulatus-group are shown that E. serrulatus from different populations but from water bodies belonging to the same river basin crossed each others successfully. The interpopulation crosses of E. serrulatus populations collected from different river basins (Dnipro, Danube and Dniester river basins) were sterile. In this group of experiments we assigned evidence of sterility to four categories: 1) incomplete copulation or absence of copulation; 2) nonviable eggs; 3) absence of egg membranes or egg sacs 4) empty egg membranes. These crossbreeding studies suggest the presence of cryptic species in the E. serrulatus inhabiting ecologically different populations in many parts of its range. The same crossbreeding experiments were carries out between Eucyclops serrulatus and morphological similar species – Eucyclops macruroides from Baltic and Black Sea basins. The reciprocal crossings between these two species were sterile. Thus taxonomic heterogeneity among species of genus Eucyclops lower in E. macruroides than in E. serrulatus. The interpopulation crosses of E. macruroides populations collected from distant part of range were fertile. These crossbreeding studies suggest that E. macruroides species complex was evaluated as more stable than E. serrulatus species complex.

Colletotrichum Gloeosporioides Species Complex: Pathogen Causing Anthracnose, Gummosis and Die-Back Diseases of Cashew (Anacardium Occidentale L.) In Ghana

2020 ◽  
Vol 2 (6) ◽  
Author(s):  
A. Muntala ◽  
P. M. Norshie ◽  
K. G. Santo ◽  
C. K. S. Saba
Keyword(s):  
Species Complex ◽  
Colletotrichum Gloeosporioides ◽  
Potato Dextrose Agar ◽  
Causal Agent ◽  
Anacardium Occidentale ◽  
Causative Organism ◽  
Pathogenicity Test ◽  
Small Water ◽  
Colletotrichum Gloeosporioides Species Complex

A survey was conducted in twenty-five cashew (Anacardium occidentale) orchards in five communities in the Dormaa-Central Municipality of Bono Region of Ghana to assess the incidence and severity of anthracnose, gummosis and die-back diseases on cashew. Cashew diseased samples of leaves, stem, inflorescences, twigs, flowers, nuts and apples showing symptoms (e. g. small, water-soaked, circular or irregular yellow, dark or brown spots or lesions on leaves, fruits and flowers, sunken surface, especially on the apples, blight, gum exudates) were collected for isolation of presumptive causative organism. The pathogen was isolated after disinfecting the excised diseased pieces in 70% ethanol, plated on potato dextrose agar (PDA) and incubated at 28 oC for 3 to 7 days. The identity of the putative pathogen was morphologically and culturally confirmed as belonging to Colletotrichum gloeosporioides species complex using standard mycological identification protocols. The pathogen had varied conidia sizes of between 9-15 up to 20 μm in length and diameter of 3-6 μm. The conidia were straight and cylindrically shaped with rounded or obtuse ends. The septate mycelium was whitish-grey, velvety and cotton-like in appearance from the top. The results confirmed the presence of the pathogen in the orchards with incidence ranging from 6.9% and 14.0% for gummosis and averaged 22.9% for anthracnose infected orchards. The result of the pathogenicity test confirmed the isolates to be pathogenic on inoculated cashew seedlings and were consistently re-isolated, thereby establishing the pathogen as the true causal agent of the said diseases in cashew trees and thus completed the Koch’s postulate.

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