scholarly journals Early Detection and Identification of the Main Fungal Pathogens for Resistance Evaluation of New Genotypes of Forest Trees

Forests ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 732 ◽  
Author(s):  
Konstantin Shestibratov ◽  
Oleg Baranov ◽  
Natalya Subbotina ◽  
Vadim Lebedev ◽  
Stanislav Panteleev ◽  
...  
Keyword(s):  
Early Detection ◽  
Fungal Pathogens ◽  
Molecular Genetic ◽  
Internal Transcribed Spacers ◽  
Silver Birch ◽  
Forest Trees ◽  
In Planta ◽  
Genetic Method ◽  
Detection And Identification ◽  
Its1 And Its2

The growing importance of forest plantations increases the demand for phytopathogen resistant forest trees. This study describes an effective method for early detection and identification of the main fungal phytopathogens in planting material of silver birch (Betula pendula) and downy birch (B. pubescens), based on the estimation of the size of the internal transcribed spacers (ITS1 and ITS2) in the 18S-5.8S-28S rDNA gene cluster, which are species-specific for most micromycetes. The electrophoretic assay of the ITS1 and ITS2 loci has allowed us to identify predominant phytopathogenic fungal species in downy and silver birch in planta. This new molecular genetic method can be used to screen birch and other forest trees for different fungal pathogens to evaluate disease resistance. This information can be useful in breeding new genotypes of forest trees, including transgenic clones with modified wood composition.

A simple molecular method for rapid identification of commercially used Amblyseius and Neoseiulus species (Acari: Phytoseiidae)

Zootaxa ◽  
2018 ◽  
Vol 4394 (2) ◽  
pp. 270
Author(s):  
M.Y. SYROMYATNIKOV ◽  
A.V. KOKINA ◽  
N.A. BELYAKOVA ◽  
E.G. KOZLOVA ◽  
V.N. POPOV
Keyword(s):  
Molecular Genetic ◽  
Mite Species ◽  
Rapid Identification ◽  
Internal Transcribed Spacers ◽  
Dna Fragments ◽  
Neoseiulus Cucumeris ◽  
Accurate Identification ◽  
Pcr Rflp ◽  
Pcr Products ◽  
Its1 And Its2

Predatory mites from the Amblyseius (Neoseiulus) genus (Family Phytoseiidae, Order Parasitiformes) are widely used for protecting plants against pests, especially thrips. The differentiation of Amblyseius and Neoseiulus species by their morphological features is problematic despite the fact that they are taxonomically different genera. The Phytoseiidae family includes a lot of species that are extremely difficult to distinguish from each other. The discovery of new molecular genetic markers might considerably facilitate the express identification of commercial mite species. Despite their high morphological similarity, the three common commercial Amblyseius and Neoseiulus mite species (Neoseiulus cucumeris, Amblyseius swirskii, and Neoseiulus barkeri) differed significantly in the nucleotide sequences of DNA fragments containing the ITS1 and ITS2 internal transcribed spacers. We found that when PCR products of the amplified DNA fragments from A. swirskii, N. cucumeris, and N. barkeri were treated with a combination of AccB1I, AspLEI, and SspI endonucleases and the resulting products were separated by electrophoresis in agarose gel, the obtained picture was sufficiently specific to provide accurate identification of the analyzed mite species. The lengths of the digestion products were different enough to allow their resolution in agarose gels. The PCR-RFLP method developed by us allows the rapid and accurate identification of commercially used Amblyseius and Neoseiulus species without DNA sequencing. The combination of the three endonucleases (AccB1I, AspLEI, and SspI) and FaeI can be used for the differentiation of all other but less frequently commercially used Phytoseiidae mites. 

Myotonic dystrophy Rossolimo-Churchman-Steinert-Batten (clinical case)

2020 ◽  
pp. 71-72
Author(s):  
И.А. Синельникова ◽  
И.В. Сопрунова ◽  
О.П. Николаева
Keyword(s):  
Case Report ◽  
Myotonic Dystrophy ◽  
Clinical Case ◽  
Molecular Genetic ◽  
Ctg Repeats ◽  
Molecular Genetic Method ◽  
Genetic Method ◽  
Family Case ◽  
Dmpk Gene

В статье представлено описание семейного случая миотонической дистрофии Россолимо-Штейнерта-Куршмана-Баттена. Диагноз подтвержден в результате ДНК-диагностики: выявлено увеличенное число копий CTG-повтора гена DMPK, ответственного за развитие миотонической дистрофии. A family case report of Rossolimo-Steinert-Curschmann myotonic dystrophy is presented. An increased number of copies of CTG-repeats of the DMPK gene responsible for the development of MD, i.e., the diagnosis was confirmed by molecular genetic method.

scholarly journals In Silico Study Suggesting the Bias of Primers Choice in the Molecular Identification of Fungal Aerosols

2021 ◽  
Vol 7 (2) ◽  
pp. 99
Author(s):  
Hamza Mbareche ◽  
Marc Veillette ◽  
Guillaume J. Bilodeau
Keyword(s):  
In Silico ◽  
Fungal Diversity ◽  
High Throughput Sequencing ◽  
In Silico Analysis ◽  
Its Region ◽  
Internal Transcribed Spacers ◽  
Sequence Length ◽  
Universal Method ◽  
Continuous Work ◽  
Its1 And Its2

This paper presents an in silico analysis to assess the current state of the fungal UNITE database in terms of the two eukaryote nuclear ribosomal regions, Internal Transcribed Spacers 1 and 2 (ITS1 and ITS2), used in describing fungal diversity. Microbial diversity is often evaluated with amplicon-based high-throughput sequencing approaches, which is a target enrichment method that relies on the amplification of a specific target using particular primers before sequencing. Thus, the results are highly dependent on the quality of the primers used for amplification. The goal of this study is to validate if the mismatches of the primers on the binding sites of the targeted taxa could explain the differences observed when using either ITS1 or ITS2 in describing airborne fungal diversity. Hence, the choice of the pairs of primers for each barcode concur with a study comparing the performance of ITS1 and ITS2 in three occupational environments. The sequence length varied between the amplicons retrieved from the UNITE database using the pair of primers targeting ITS1 and ITS2. However, the database contains an equal number of unidentified taxa from ITS1 and ITS2 regions in the six taxonomic levels employed (phylum, class, order, family, genus, species). The chosen ITS primers showed differences in their ability to amplify fungal sequences from the UNITE database. Eleven taxa consisting of Trichocomaceae, Dothioraceae, Botryosphaeriaceae, Mucorales, Saccharomycetes, Pucciniomycetes, Ophiocordyceps, Microsporidia, Archaeorhizomycetes, Mycenaceae, and Tulasnellaceae showed large variations between the two regions. Note that members of the latter taxa are not all typical fungi found in the air. As no universal method is currently available to cover all the fungal kingdom, continuous work in designing primers, and particularly combining multiple primers targeting the ITS region is the best way to compensate for the biases of each one to get a larger view of the fungal diversity.

scholarly journals Early Detection of Exposure to Toxic Chemicals Using Continuously Recorded Multi-Sensor Physiology

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3616
Author(s):  
Jan Ubbo van Baardewijk ◽  
Sarthak Agarwal ◽  
Alex S. Cornelissen ◽  
Marloes J. A. Joosen ◽  
Jiska Kentrop ◽  
...  
Keyword(s):  
Machine Learning ◽  
Early Detection ◽  
Physiological Signals ◽  
Machine Learning Techniques ◽  
Detection Accuracy ◽  
Chemical Agent ◽  
Counter Measures ◽  
Detection And Identification ◽  
Life Saving ◽  
Future Work

Early detection of exposure to a toxic chemical, e.g., in a military context, can be life-saving. We propose to use machine learning techniques and multiple continuously measured physiological signals to detect exposure, and to identify the chemical agent. Such detection and identification could be used to alert individuals to take appropriate medical counter measures in time. As a first step, we evaluated whether exposure to an opioid (fentanyl) or a nerve agent (VX) could be detected in freely moving guinea pigs using features from respiration, electrocardiography (ECG) and electroencephalography (EEG), where machine learning models were trained and tested on different sets (across subject classification). Results showed this to be possible with close to perfect accuracy, where respiratory features were most relevant. Exposure detection accuracy rose steeply to over 95% correct during the first five minutes after exposure. Additional models were trained to correctly classify an exposed state as being induced either by fentanyl or VX. This was possible with an accuracy of almost 95%, where EEG features proved to be most relevant. Exposure detection models that were trained on subsets of animals generalized to subsets of animals that were exposed to other dosages of different chemicals. While future work is required to validate the principle in other species and to assess the robustness of the approach under different, realistic circumstances, our results indicate that utilizing different continuously measured physiological signals for early detection and identification of toxic agents is promising.

scholarly journals A method for early detection and identification of fungal contamination of building materials using e-nose

PLoS ONE ◽  
2019 ◽  
Vol 14 (4) ◽  
pp. e0215179 ◽  
Author(s):  
Zbigniew Suchorab ◽  
Magdalena Frąc ◽  
Łukasz Guz ◽  
Karolina Oszust ◽  
Grzegorz Łagód ◽  
...  
Keyword(s):  
Early Detection ◽  
Building Materials ◽  
Fungal Contamination ◽  
Detection And Identification

scholarly journals A Microbial Fermentation Mixture Reduces Fusarium Head Blight and Promotes Grain Weight but does not impact Septoria tritici blotch

2021 ◽  
Author(s):  
Tony Twamley ◽  
Mark Gaffney ◽  
Angela Feechan
Keyword(s):  
Fusarium Head Blight ◽  
Fungal Pathogens ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Microbial Fermentation ◽  
In Planta ◽  
Head Blight ◽  
Zymoseptoria Tritici ◽  
The Impact

AbstractFusarium graminearum and Zymoseptoria tritici cause economically important diseases of wheat. F. graminearum is one of the primary causal agents of Fusarium head blight (FHB) and Z. tritici is the causal agent of Septoria tritici blotch (STB). Alternative control methods are required in the face of fungicide resistance and EU legislation which seek to cut pesticide use by 2030. Both fungal pathogens have been described as either hemibiotrophs or necrotrophs. A microbial fermentation-based product (MFP) was previously demonstrated to control the biotrophic pathogen powdery mildew, on wheat. Here we investigated if MFP would be effective against the non-biotrophic fungal pathogens of wheat, F. graminearum and Z. tritici. We assessed the impact of MFP on fungal growth, disease control and also evaluated the individual constituent parts of MFP. Antifungal activity towards both pathogens was found in vitro but MFP only significantly decreased disease symptoms of FHB in planta. In addition, MFP was found to improve the grain number and weight, of uninfected and F. graminearum infected wheat heads.

scholarly journals Advances and Perspectives of Transgenic Technology and Biotechnological Application in Forest Trees

2021 ◽  
Vol 12 ◽  
Author(s):  
Yiyi Yin ◽  
Chun Wang ◽  
Dandan Xiao ◽  
Yanting Liang ◽  
Yanwei Wang
Keyword(s):  
Genetic Transformation ◽  
Molecular Genetic ◽  
Forest Tree ◽  
Breeding Cycle ◽  
Forest Trees ◽  
Transgenic Technology ◽  
Forest Tree Breeding ◽  
Exogenous Dna ◽  
Advantages And Disadvantages ◽  
Gm Trees

Transgenic technology is increasingly used in forest-tree breeding to overcome the disadvantages of traditional breeding methods, such as a long breeding cycle, complex cultivation environment, and complicated procedures. By introducing exogenous DNA, genes tightly related or contributed to ideal traits—including insect, disease, and herbicide resistance—were transferred into diverse forest trees, and genetically modified (GM) trees including poplars were cultivated. It is beneficial to develop new varieties of GM trees of high quality and promote the genetic improvement of forests. However, the low transformation efficiency has hampered the cultivation of GM trees and the identification of the molecular genetic mechanism in forest trees compared to annual herbaceous plants such as Oryza sativa. In this study, we reviewed advances in transgenic technology of forest trees, including the principles, advantages and disadvantages of diverse genetic transformation methods, and their application for trait improvement. The review provides insight into the establishment and improvement of genetic transformation systems for forest tree species. Challenges and perspectives pertaining to the genetic transformation of forest trees are also discussed.

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