scholarly journals Hybridisation and introgression in British Helosciadium (Apiaceae).

2020 ◽  
Vol 2 (1) ◽  
pp. 27-42
Author(s):  
Stuart D. Desjardins ◽  
Andrew G. Shaw ◽  
Judith A. Webb
Keyword(s):  
Dna Barcoding ◽  
Parental Species ◽  
Supporting Evidence ◽  
Nuclear Markers ◽  
Early Generation ◽  
The Third ◽  
Chloroplast Marker ◽  
Putative Hybrids

Reticulation between Helosciadium repens (Jacq.) W.D.J. Koch and H. nodiflorum (L.) W.D.J. Koch (Apiaceae) has been the source of much speculation, but until now supporting evidence has remained largely anecdotal. In the current study inter-specific hybridisation and introgression between the two species was confirmed using DNA barcoding. The parentage of three putative hybrids collected from Port Meadow, Oxfordshire (UK) was determined using a maternally-inherited chloroplast marker (rps16-trnK) and two biparentally-inherited nuclear markers (LEAFYi2, ITS). Two of the individuals are early-generation hybrids between H. repens and H. nodiflorum, F1 or otherwise, while the third is most likely a backcross to H. repens. These individuals are the first confirmed hybrids/hybrid derivatives between the two parental species, and represent a new addition to the British flora. The hybrids closely resemble H. nodiflorum var. longipedunculatum F.W. Schultz, and in our view should be treated as H. × longipedunculatum (F.W. Schultz) Desjardins.

KERCH STRAIT IN KAMYSH-BURUN SPIT AREA: HIGH-RESOLUTION SEISMOACOUSTIC APPROACH

2018 ◽  
Author(s):  
В. Зинько ◽  
V. Zin'ko ◽  
А. Зверев ◽  
A. Zverev ◽  
М. Федин ◽  
...  
Keyword(s):  
High Resolution ◽  
Fracture Zone ◽  
Sedimentary Cover ◽  
Sedimentary Rocks ◽  
The West ◽  
Early Generation ◽  
The Third ◽  
Azov Sea ◽  
Kerch Strait ◽  
Made In

The seismoacoustical investigations was made in the western part of the Kerch strait (Azov sea) near Kamysh-Burun spit. The fracture zone with dislocated sedimentary rocks layers and buried erosional surface was revealed to the west of spit. Three seismofacial units was revealed to the east of spit. The first unit was modern sedimentary cover. The second ones has cross-bedding features and was, probably, the part of early generation of Kamysh-Burun spit, which lied to the east of its modern position. The lower border of the second unit is the erosional surface supposed of phanagorian age. The third unit is screened by acoustic shedows in large part.

The use of flavonoid glycosides for the identification of elm hybrids

1993 ◽  
Vol 23 (4) ◽  
pp. 611-616 ◽  
Author(s):  
Daniela Heimler ◽  
Andrea Pieroni ◽  
Lorenzo Mittempergher ◽  
Pietro Buzzini
Keyword(s):  
High Performance ◽  
Parental Species ◽  
Flavonoid Glycoside ◽  
Flavonoid Glycosides ◽  
Natural Hybrids ◽  
Probable Presence ◽  
Multivariate Discriminant ◽  
Number Of Individuals ◽  
Layer Chromatography ◽  
Putative Hybrids

The utilization of elm leaf flavonoids as biochemical markers for the identification of artificial and natural hybrids of elm species is discussed. Two to 11 individuals from controlled crosses of Ulmuscarpinifolia Gled., Ulmuspumila L., Ulmusparvifolia Jacq., and Ulmusjaponica (R.) Sarg. were examined. Five to seven individuals from each parental species, and a number of putative hybrids between U. carpinifolia and U. pumila that naturally occur in central and northern Italy, were also examined. Quantitative data on leaf flavonoid glycosides were obtained by means of high-performance thin layer chromatography and examined by multivariate discriminant analysis. The results show that it is possible to identify the hybrid obtained between these species even if the parents are unknown, provided a number of individuals of the parental species are examined; therefore, it is also possible to certify putative hybrids. The higher variability of the flavonoid glycoside data of U. carpinifolia and U. pumila and the probable presence of F2 generation individuals make the certification of natural hybrids between these two species in some cases difficult or even impossible.

scholarly journals Opening Pandora’s Molecular Box

Zootaxa ◽  
2011 ◽  
Vol 2946 (1) ◽  
pp. 60 ◽  
Author(s):  
MALTE C. EBACH ◽  
MARCELO R. DE CARVALHO ◽  
DAVID M. WILLIAMS
Keyword(s):  
Dna Barcoding ◽  
Molecular Systematics ◽  
Molecular Data ◽  
Supporting Evidence ◽  
Dna Taxonomy ◽  
Theoretical Position ◽  
Conflicting Evidence ◽  
Original Question ◽  
Molecular Homology ◽  
Molecular Trees

Mooi & Gill (2010) have prised open the cap of the molecular systematics vial and caused a debate to take-off in the ichthyological community. Molecular trees and their supporting evidence are the first two items to leave this Pandora’s box, closely followed by DNA barcoding and DNA taxonomy. In short, the debate is fuelled by the nature of molecular data: can nucleotide sequences provide the necessary evidence for relationship? The majority (Wiley et al., 2011) believe that DNA contains informative data; however, in our view, they have failed to ascertain the truth of their claim. Not all data are informative. Data may provide supporting evidence, conflicting evidence, or no evidence at all. Assuming that all data are informative apriori to analysis is a theoretical position, not an empirical one. We claim that systematics is, quite the contrary, empirical, and relies on evidence rather than on implicit measurements of data. Consequently, this assertion leads back to the original question of evidence in molecular systematics, namely molecular homology.

scholarly journals Characterization of the Resistance to Meloidogyne arenaria in an Interspecific Arachis Spp. Hybrid1

1990 ◽  
Vol 17 (2) ◽  
pp. 106-108 ◽  
Author(s):  
J. L. Starr ◽  
G. L. Schuster ◽  
C. E. Simpson
Keyword(s):  
Parental Species ◽  
Juvenile Stage ◽  
Meloidogyne Arenaria ◽  
Diverse Populations ◽  
Acid Fuchsin ◽  
Second Stage ◽  
The Third ◽  
Adult Females ◽  
Race 1

Abstract Seedlings of TP-135, an interspecific hybrid derived from four Arachis spp. and resistant to Meloidogyne arenaria race 1, and the susceptible cultivar Tamnut 74 were inoculated with 2,500 freshly hatched juveniles of M. arenaria. Plants were harvested at 7, 14, 21, and 35 days after inoculation (DAI) and the roots treated with acid fuchsin to stain infecting nematodes. Adult females with eggs were detected in roots of Tamnut 74 at 21 DAI, producing 1,395 eggs/g roots at 35 DAI. Most nematodes remained as second-stage juveniles and no nematode was observed to develop beyond the third or fourth juvenile stage in roots of TP-135 by 35 DAI. In other experiments, seedlings of Tamnut 74 and root cuttings of TP-135 were each inoculated separately with 3,000 eggs of 10 geographically diverse populations of M. arenaria race 1. All populations of the nematode had greater (P = 0.01) reproduction on Tamnut 74 than on TP-135. Based on these data, we conclude that although the mechanism of resistance in TP-135 to M. arenaria is most similar to that of the wild species A. cardenasii, it is not identical to that of any of the nematode-resistant parental species. Furthermore, we believe that the resistance will be effective against a range of populations of the nematode.

scholarly journals PERKEMBANGAN TEMA PUISI-PUISI PENYAIR BANGKALAN: KAJIAN SEJARAH SASTRA

ATAVISME ◽  
2017 ◽  
Vol 20 (2) ◽  
pp. 168-180
Author(s):  
Muhri Muhri
Keyword(s):  
Literary History ◽  
First Generation ◽  
Second Generation ◽  
Literary Work ◽  
Fourth Generation ◽  
Third Generation ◽  
Early Generation ◽  
The Third ◽  
The Arts ◽  
Common Interests

This research aims to classify the Bangkalan poets into generations and trends on the themes of each generation. The underlying theories are those that affect the subdiscipline of literary history, especially the theories within the deconstructive paradigm. Data were obtained through interviews and study of literary work, namely the works of Bangkalan poets. From the analysis, generation of poets of Bangkalan can be divided into four generations based on tradition and common interests as manifested in the organization or forum where those poets gather. The first generation was in the Arts Council of Bangkalan (Dewan Kesenian Bangkalan or DKB), the second generation was raised in the Tera' Bulan Community, the third generation came from the campus theater communities around Bangkalan, and the fourth generation was in Masyarakat Lumpur Community and Bawah Arus Community. Metaphysical and social were dominant themes in the early generation, libidinal love theme was a theme that tended to appear in the second generation, local and lyrical themes tended to emerge in the third and fourth generation.

Illusory Conjunctions of Color and Motion With Shape Following Bilateral Parietal Lesions

1998 ◽  
Vol 9 (3) ◽  
pp. 167-175 ◽  
Author(s):  
Lori J. Bernstein ◽  
Lynn C. Robertson
Keyword(s):  
Parietal Lobe ◽  
The Other ◽  
Feature Integration ◽  
Supporting Evidence ◽  
Spatial Representations ◽  
Brain Areas ◽  
Feature Representations ◽  
The Third ◽  
Illusory Conjunctions ◽  
Normal Feature

The primate visual system responds to shapes, colors, and various other features more strongly in some brain areas than others. However, it remains unclear how these features are bound together so that an object with all its attributes is perceived. A patient (R.M.) with bilateral parietal-occipital lesions has been shown previously to mis-combine the shape and color of items, making errors known as illusory conjunctions (ICs). In this study, we examined the effects of a third feature (motion) on this patient's IC rates. R.M. was presented with two letters that moved in different ways. He often reported seeing the shape of one of the letters with the other letter's motion. His performance on the same task with three features shows that correctly combining two features did not necessarily lead to correctly binding the third. These data support modularity of feature representations in the human brain and provide supporting evidence that spatial representations associated with the parietal lobe are necessary for normal feature integration.

Primary Arithmetic: Children Inventing their Own Procedures

1993 ◽  
Vol 41 (4) ◽  
pp. 200-203
Author(s):  
Constance Kamii ◽  
Barbara A. Lewis ◽  
Sally Jones Livingston
Keyword(s):  
New York ◽  
New York City ◽  
Public School ◽  
Present Article ◽  
Private School ◽  
York City ◽  
Computational Algorithms ◽  
Supporting Evidence ◽  
The Third ◽  
Children’S Thinking

In an article that appeared in the Arithmetic Teacher, Madell (1985) described findings from a private school in New York City in which children were not taught any algorithms until the end of the third grade. Without algorithms, the children devised their own ways of solving computation problems. Madell's observation of the children's thinking led him to conclude that “children not only can but should create their own computational algorithms” (p. 20) and that “children can and should do their own thinking” (p. 22). The purpose of the present article is to reiterate Madell's call for reform, with supporting evidence from a public school near Birmingham, Alabama.

First records raise questions: DNA barcoding of Odonata in the middle of the Mediterranean

Genome ◽  
2020 ◽  
pp. 1-11 ◽  
Author(s):  
Tomasz Rewicz ◽  
Arnold Móra ◽  
Grzegorz Tończyk ◽  
Ada Szymczak ◽  
Michal Grabowski ◽  
...  
Keyword(s):  
Dna Barcoding ◽  
Related Species ◽  
Dna Barcode ◽  
Taxonomic Status ◽  
Index Number ◽  
Reference Library ◽  
Nuclear Markers ◽  
Closely Related Species ◽  
Maltese Islands ◽  
Morphological Species

We present the results of the first-ever DNA barcoding study of odonates from the Maltese Islands. In total, 10 morphologically identified species were collected during a two-week long expedition in 2018. Eighty cytochrome c oxidase subunit I (COI) barcodes were obtained from the collected specimens. Intra- and interspecific distances ranged from 0.00% to 2.24% and 0.48% to 17.62%, respectively. Successful species identification based on ascribing a single morphological species to a single Barcode Index Number (BIN) was achieved for eight species (80%). In the case of two species, Ischnura genei and Anax parthenope, BINs were shared with other closely related species. The taxonomic status of I. genei is questionable and the phylogenetic relationship between A. imperator/parthenope is not clear. Further studies involving a series of adult specimens collected in a wide spatial range and nuclear markers are necessary to resolve these cases. Therefore, this dataset serves as an initial DNA barcode reference library for Maltese odonates, within a larger project: Aquatic Macroinvertebrates DNA Barcode Library of Malta.

scholarly journals Application of plastid and nuclear markers to DNA barcoding of Euro-Mediterranean oaks (Quercus, Fagaceae): problems, prospects and phylogenetic implications

2013 ◽  
Vol 172 (4) ◽  
pp. 478-499 ◽  
Author(s):  
Marco C. Simeone ◽  
Roberta Piredda ◽  
Alessio Papini ◽  
Federico Vessella ◽  
Bartolomeo Schirone
Keyword(s):  
Dna Barcoding ◽  
Nuclear Markers ◽  
Phylogenetic Implications ◽  
Mediterranean Oaks
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