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Unraveling the First Step in the Streptomyces Scabies Pathology: How Does the Pathogen Sense It Is in the Vicinity of a Living R
Unraveling the first step in the Streptomyces scabies pathology: How does the pathogen sense it is in the vicinity of a living root? By: Dianna Mojica A thesis submitted to the Department of Biology at California State University, Bakersfield in partial fulfilment for the degree of Master of Science in Biology Spring 2021 ii Copyright By Dianna Mojica 2021 i Table of Contents Acknowledgements v Abstract vi Keywords viii List of Figures ix Chapter 1 8 Introduction 8 Streptomyces, an unusual bacterial genus 8 Streptomyces as symbionts in interactions with plants and animals 10 Streptomyces scabies, a well-established and worldwide occurring plant pathogen 12 Literature Cited 16 Chapter 2 22 Abstract 22 Introduction 23 Materials and Methods 26 Bacterial strains and growth conditions used in this study 26 Thaxtomin A production in response to living or dead radish plant material 26 Thaxtomin A production in response to radish root exudates 28 Cellulase activity and thaxtomin A production in response to cellulose 29 S. scabies cannot distinguish between a living and a dead host plant to start thaxtomin A production 30 Literature Cited 39 Figures 43 Chapter 3 48 Conclusion 48 Literature Cited 50 iv Acknowledgements I thank my thesis advisor Dr. Francis for donating her time and sharing her knowledge on Streptomyces scabies as well as guiding me on how to write this thesis. I also thank Dr. Stokes and Dr. Keller for agreeing to be part of my thesis committee in such short notice. v Abstract Streptomyces is the largest genus within the phylum Actinobacteria. The genus contains Gram-positive bacteria with a complex life cycle resembling that of fungi and are distinctly recognized for their diverse secondary metabolites that have pharmaceutical, agricultural and industrial properties. -
Morphological and Molecular Characterisation of Scutellonema Species from Yam (Dioscorea Spp.) and a Key to the Species of the Genus ∗ Yao A
Nematology 00 (2017) 1-37 brill.com/nemy Morphological and molecular characterisation of Scutellonema species from yam (Dioscorea spp.) and a key to the species of the genus ∗ Yao A. K OLOMBIA 1,2, , Gerrit KARSSEN 1,3,NicoleVIAENE 1,4,P.LavaKUMAR 2,LisaJOOS 1, ∗ Danny L. COYNE 5 and Wim BERT 1, 1 Nematology Research Unit, Department of Biology, Ghent University, K.L. Ledeganckstraat 35, B-9000 Ghent, Belgium 2 International Institute of Tropical Agriculture (IITA), PMB 5320, Oyo Road, Ibadan, Nigeria 3 National Plant Protection Organization, 6706 EA Wageningen, The Netherlands 4 Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), B-9820 Merelbeke, Belgium 5 IITA, Kasarani, P.O. Box 30772-00100, Nairobi, Kenya Received: 22 February 2017; revised: 30 May 2017 Accepted for publication: 1 June 2017; available online: ??? Summary – The yam nematode, Scutellonema bradys, is a major threat to yam (Dioscorea spp.) production across yam-growing regions. In West Africa, this species cohabits with many morphologically similar congeners and, consequently, its accurate diagnosis is essential for control and for monitoring its movement. In the present study, 46 Scutellonema populations collected from yam rhizosphere and yam tubers in different agro-ecological zones in Ghana and Nigeria were characterised by their morphological features and by sequencing of the D2-D3 region of the 28S rDNA gene and the mitochondrial COI genes. Molecular phylogeny, molecular species delimitation and morphology revealed S. bradys, S. cavenessi, S. clathricaudatum and three undescribed species from yam rhizosphere. Only S. bradys was identified from yam tuber tissue, however. For barcoding and identifying Scutellonema spp., the most suitable marker used was the COI gene. -
Improved Taxonomy of the Genus Streptomyces
UNIVERSITEIT GENT Faculteit Wetenschappen Vakgroep Biochemie, Fysiologie & Microbiologie Laboratorium voor Microbiologie Improved taxonomy of the genus Streptomyces Benjamin LANOOT Scriptie voorgelegd tot het behalen van de graad van Doctor in de Wetenschappen (Biochemie) Promotor: Prof. Dr. ir. J. Swings Co-promotor: Dr. M. Vancanneyt Academiejaar 2004-2005 FACULTY OF SCIENCES ____________________________________________________________ DEPARTMENT OF BIOCHEMISTRY, PHYSIOLOGY AND MICROBIOLOGY UNIVERSITEIT LABORATORY OF MICROBIOLOGY GENT IMPROVED TAXONOMY OF THE GENUS STREPTOMYCES DISSERTATION Submitted in fulfilment of the requirements for the degree of Doctor (Ph D) in Sciences, Biochemistry December 2004 Benjamin LANOOT Promotor: Prof. Dr. ir. J. SWINGS Co-promotor: Dr. M. VANCANNEYT 1: Aerial mycelium of a Streptomyces sp. © Michel Cavatta, Academy de Lyon, France 1 2 2: Streptomyces coelicolor colonies © John Innes Centre 3: Blue haloes surrounding Streptomyces coelicolor colonies are secreted 3 4 actinorhodin (an antibiotic) © John Innes Centre 4: Antibiotic droplet secreted by Streptomyces coelicolor © John Innes Centre PhD thesis, Faculty of Sciences, Ghent University, Ghent, Belgium. Publicly defended in Ghent, December 9th, 2004. Examination Commission PROF. DR. J. VAN BEEUMEN (ACTING CHAIRMAN) Faculty of Sciences, University of Ghent PROF. DR. IR. J. SWINGS (PROMOTOR) Faculty of Sciences, University of Ghent DR. M. VANCANNEYT (CO-PROMOTOR) Faculty of Sciences, University of Ghent PROF. DR. M. GOODFELLOW Department of Agricultural & Environmental Science University of Newcastle, UK PROF. Z. LIU Institute of Microbiology Chinese Academy of Sciences, Beijing, P.R. China DR. D. LABEDA United States Department of Agriculture National Center for Agricultural Utilization Research Peoria, IL, USA PROF. DR. R.M. KROPPENSTEDT Deutsche Sammlung von Mikroorganismen & Zellkulturen (DSMZ) Braunschweig, Germany DR. -
Plant Protection in Tropical Root and Tuber Crops
Plant Protection in Tropical Root and Tuber Crops P. Parvatha Reddy Plant Protection in Tropical Root and Tuber Crops P. Parvatha Reddy Indian Institute of Horticultural Research Bangalore , Karnataka , India ISBN 978-81-322-2388-7 ISBN 978-81-322-2389-4 (eBook) DOI 10.1007/978-81-322-2389-4 Library of Congress Control Number: 2015942675 Springer New Delhi Heidelberg New York Dordrecht London © Springer India 2015 This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifi cally the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfi lms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specifi c statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. The publisher, the authors and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher nor the authors or the editors give a warranty, express or implied, with respect to the material contained herein or for any errors or omissions that may have been made. Printed on acid-free paper Springer (India) Pvt. Ltd. is part of Springer Science+Business Media (www.springer.com) Pref ace In the year 2012, the major root and tuber (R&T) crops occupied about 53 million hectares, producing 797 million metric tons worldwide, 42 % of which was from Asia and 6.45 % from India. -
Theory Manual Course No. Pl. Path
NAVSARI AGRICULTURAL UNIVERSITY Theory Manual INTRODUCTORY PLANT NEMATOLOGY Course No. Pl. Path 2.2 (V Dean’s) nd 2 Semester B.Sc. (Hons.) Agri. PROF.R.R.PATEL, ASSISTANT PROFESSOR Dr.D.M.PATHAK, ASSOCIATE PROFESSOR Dr.R.R.WAGHUNDE, ASSISTANT PROFESSOR DEPARTMENT OF PLANT PATHOLOGY COLLEGE OF AGRICULTURE NAVSARI AGRICULTURAL UNIVERSITY BHARUCH 392012 1 GENERAL INTRODUCTION What are the nematodes? Nematodes are belongs to animal kingdom, they are triploblastic, unsegmented, bilateral symmetrical, pseudocoelomateandhaving well developed reproductive, nervous, excretoryand digestive system where as the circulatory and respiratory systems are absent but govern by the pseudocoelomic fluid. Plant Nematology: Nematology is a science deals with the study of morphology, taxonomy, classification, biology, symptomatology and management of {plant pathogenic} nematode (PPN). The word nematode is made up of two Greek words, Nema means thread like and eidos means form. The words Nematodes is derived from Greek words ‘Nema+oides’ meaning „Thread + form‟(thread like organism ) therefore, they also called threadworms. They are also known as roundworms because nematode body tubular is shape. The movement (serpentine) of nematodes like eel (marine fish), so also called them eelworm in U.K. and Nema in U.S.A. Roundworms by Zoologist Nematodes are a diverse group of organisms, which are found in many different environments. Approximately 50% of known nematode species are marine, 25% are free-living species found in soil or freshwater, 15% are parasites of animals, and 10% of known nematode species are parasites of plants (see figure at left). The study of nematodes has traditionally been viewed as three separate disciplines: (1) Helminthology dealing with the study of nematodes and other worms parasitic in vertebrates (mainly those of importance to human and veterinary medicine). -
Ep 2434019 A1
(19) & (11) EP 2 434 019 A1 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) Int Cl.: 28.03.2012 Bulletin 2012/13 C12N 15/82 (2006.01) C07K 14/395 (2006.01) C12N 5/10 (2006.01) G01N 33/50 (2006.01) (2006.01) (2006.01) (21) Application number: 11160902.0 C07K 16/14 A01H 5/00 C07K 14/39 (2006.01) (22) Date of filing: 21.07.2004 (84) Designated Contracting States: • Kamlage, Beate AT BE BG CH CY CZ DE DK EE ES FI FR GB GR 12161, Berlin (DE) HU IE IT LI LU MC NL PL PT RO SE SI SK TR • Taman-Chardonnens, Agnes A. 1611, DS Bovenkarspel (NL) (30) Priority: 01.08.2003 EP 03016672 • Shirley, Amber 15.04.2004 PCT/US2004/011887 Durham, NC 27703 (US) • Wang, Xi-Qing (62) Document number(s) of the earlier application(s) in Chapel Hill, NC 27516 (US) accordance with Art. 76 EPC: • Sarria-Millan, Rodrigo 04741185.5 / 1 654 368 West Lafayette, IN 47906 (US) • McKersie, Bryan D (27) Previously filed application: Cary, NC 27519 (US) 21.07.2004 PCT/EP2004/008136 • Chen, Ruoying Duluth, GA 30096 (US) (71) Applicant: BASF Plant Science GmbH 67056 Ludwigshafen (DE) (74) Representative: Heistracher, Elisabeth BASF SE (72) Inventors: Global Intellectual Property • Plesch, Gunnar GVX - C 6 14482, Potsdam (DE) Carl-Bosch-Strasse 38 • Puzio, Piotr 67056 Ludwigshafen (DE) 9030, Mariakerke (Gent) (BE) • Blau, Astrid Remarks: 14532, Stahnsdorf (DE) This application was filed on 01-04-2011 as a • Looser, Ralf divisional application to the application mentioned 13158, Berlin (DE) under INID code 62. -
Prioritising Plant-Parasitic Nematode Species Biosecurity Risks Using Self Organising Maps
Prioritising plant-parasitic nematode species biosecurity risks using self organising maps Sunil K. Singh, Dean R. Paini, Gavin J. Ash & Mike Hodda Biological Invasions ISSN 1387-3547 Volume 16 Number 7 Biol Invasions (2014) 16:1515-1530 DOI 10.1007/s10530-013-0588-7 1 23 Your article is protected by copyright and all rights are held exclusively by Springer Science +Business Media Dordrecht. This e-offprint is for personal use only and shall not be self- archived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com”. 1 23 Author's personal copy Biol Invasions (2014) 16:1515–1530 DOI 10.1007/s10530-013-0588-7 ORIGINAL PAPER Prioritising plant-parasitic nematode species biosecurity risks using self organising maps Sunil K. Singh • Dean R. Paini • Gavin J. Ash • Mike Hodda Received: 25 June 2013 / Accepted: 12 November 2013 / Published online: 17 November 2013 Ó Springer Science+Business Media Dordrecht 2013 Abstract The biosecurity risks from many plant- North and Central America, Europe and the Pacific parasitic nematode (PPN) species are poorly known with very similar PPN assemblages to Australia as a and remain a major challenge for identifying poten- whole. -
Crop Protection Programme Control of Yam Diseases In
CROP PROTECTION PROGRAMME CONTROL OF YAM DISEASES IN FOREST MARGIN FARMING SYSTEMS IN GHANA DFID CPP Project R6691 (ZA0138) FINAL TECHNICAL REPORT 1 July 1996 – 30 June 2000 Project Leader: Jeff Peters Project Leader‟s institution: University of Reading, UK 1 2 Table of Contents Table of Contents 3 List of Figures 4 Collaborators 6 Executive Summary 7 1. Background 8 2. Project Purpose 10 3 Research Activities 10 3.1 Nature, distribution and extent of losses caused by the principal diseases of yam in Ghana. (Activities 1& 2) 10 3.1.1 Nematodes, Soil-borne Fungi and Foliar Fungal Pathogens 10 3.1.2 Foliar fungal pathogens 12 3.1.3 Virus diversity and distribution 12 3.2 Efficacy of various methods for treating and cleaning yam planting material and for producing clean seed yams tested under Ghanaian conditions. (Activities 3 & 4) 15 3.3 Yam growers perceptions of yam diseases, and of their responses to new or improved control measures assessed. (Activity 5) 16 3.4 Transfer of new or improved control strategies to yam growers. (Activity 6) 17 4 Outputs 18 4.1 Nature, distribution and extent of losses caused by the principal diseases of yam in Ghana (Outputs 1). 18 4.1.1 Nematodes and Soil-borne Fungi 18 4.1.2 Foliar Fungal Diseases 23 4.1.3 Viruses (Authors L Kenyon & J Hughes) (See Full Report, Annex, Section 7) 27 4.2 Improved knowledge of the etiology and epidemiology of Scutellonema bradys and Fusarium solani under Ghanaian conditions (Output 2). (Authors J Peters & A Missah) 34 4.2.1 Interaction of Scutellonema bradys and Fusarium solani in artificially inoculated micropropagated plants 34 4.2.2 The migration of Scutellonema bradys from okra to yam 35 4.3 Efficacy of methods for producing clean yam planting material and for reducing the rate of re- infection in the field tested under Ghanaian conditions. -
Importation of Fresh Fruit of Avocado, Persea Americana Miller Var. 'Hass
Importation of Fresh Fruit of Avocado, Persea americana Miller var. ‘Hass’, into the Continental United States from Colombia A Pathway-Initiated Risk Assessment October 31, 2016 Version 4 Agency Contact: Plant Epidemiology and Risk Analysis Laboratory Center for Plant Health Science and Technology United States Department of Agriculture Animal and Plant Health Inspection Service Plant Protection and Quarantine 1730 Varsity Drive, Suite 300 Raleigh, NC 27606 Pest Risk Assessment for Hass Avocado from Colombia Executive Summary The Republic of Colombia requested approval for imports into the continental United States of fresh avocado fruit, Persea americana Mill. var. ‘Hass’, without a peduncle. Because this commodity has not been imported from Colombia before, the United States Department of Agriculture (USDA), Animal and Plant Health Inspection Service (APHIS) conducted a pathway-initiated risk assessment to determine the risks associated with importing these ‘Hass’ avocados. We developed a list of pests known to occur in Colombia and associated with avocado based on the scientific literature, port-of-entry pest interception data, and information provided by the Colombian Ministry for Agriculture and Rural Development, and the Colombian Agricultural Institute (ICA). Commercial ‘Hass’ avocado is a conditional non-host for the fruit flies, Anastrepha fraterculus, A. striata, and Ceratitis spp. Thus, we did not list these organisms in the assessment. We determined that three quarantine arthropod pests were likely to follow the pathway, and qualitatively analyzed them to determine the unmitigated risk posed to the United States. Pest Taxonomy Pest Risk Potential Heilipus lauri Boheman Coleoptera: Curculionidae High Heilipus trifasciatus (Fabricius) Coleoptera: Curculionidae High Stenoma catenifer Walsingham Lepidoptera: Elaschistidae High All pests were rated High and for pests with High pest risk potential, mitigations beyond port-of- entry inspection are recommended. -
C:\Trabalho\Revista Summa\Summa
Management of crotalaria and pigeon pea for control of yam nematode diseases Marlon da Silva Garrido1, Ana Cristina Fechino Soares1, João Luiz Coimbra2, Carla da Silva Sousa1 1Centro de Ciências Agrárias, Ambientais e Biológicas, Programa de Pós-Graduação em Ciências Agrárias, Laboratório de Fitopatologia e Microbiologia Agrícola, Universidade Federal do Recôncavo da Bahia, CEP 44380-000, Cruz das Almas, BA. 2Dep. Ciências Humanas, Campus IX, Universidade Estadual da Bahia, CEP 47800-040, Barreiras, BA. Autor para correspondência: Ana Cristina Fechino Soares. [email protected] Data de chegada: 13/06/2005. Aceito para publicação em: 15/04/2008 1217 ABSTRACT Garrido, M. da S.; Soares, A.C.F.; Coimbra, J.L.; Sousa, C. da S. Management of crotalaria and pigeon pea for control of yam nematode diseases. Summa Phytopathologica, v.34, n.3, p.222-227, 2008 Management of plant-parasitic nematodes with the use of crotalaria, pigeon pea, and the combination of both in the infectivity of nematicides has not been recommended for small farmers that grow Scutellonema bradys, using tomato plants as the host plant. The third yam in the Northeastern region of Brazil, due to its high cost and experiment was conducted under field conditions to evaluate the effect residue toxicity. The use of plants with antagonistic effect to of crotalaria, pigeon pea, and the combination of both, cultivated between nematodes and green manure which improves soil chemical, physical yam planting rows and incorporated to soil surface, on yam nematodes. and biological characteristics can be a viable and low cost alternative The aqueous extract obtained form fresh matter of crotalaria had a to control parasitic nematodes. -
Parasitic Nematodes Associated with Yam (Discorea Rotundata) and Morphometric Characterization of Scutellonema Bradys in the Krachi Nchumuru District, Ghana
University of Ghana http://ugspace.ug.edu.gh PARASITIC NEMATODES ASSOCIATED WITH YAM (DISCOREA ROTUNDATA) AND MORPHOMETRIC CHARACTERIZATION OF SCUTELLONEMA BRADYS IN THE KRACHI NCHUMURU DISTRICT, GHANA BY ABDULLAH KWAME ENCHILL (10051593) THIS THESIS IS SUBMITTED TO THE UNIVERSITY OF GHANA, LEGON IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE AWARD OF M. PHIL CROP SCIENCE DEGREE JULY, 2017 1 University of Ghana http://ugspace.ug.edu.gh DECLARATION I certify that this study was conducted by me Abdullah Kwame Enchill of Crop Science Department, University of Ghana, Legon at Krachi Nchumuru District and Plant Pathology Laboratory at the University of Ghana Legon. I further testify that this thesis has never been submitted on any occasion at any University for the award of a degree and that any literature cited has been acknowledged. ………………….. Abdullah Kwame Enchill (Candidate) …………………. ………………… Dr. Eric William Cornelius Dr. Seloame Tatu Nyaku (Supervisor) (Supervisor) i University of Ghana http://ugspace.ug.edu.gh ABSTRACT A dry rot of yam Dioscorea rotundata which attacks tubers in the field and in storage is currently threatening production of the crop in the Krachi Nchumuru District of the Volta Region No detailed investigation has been conducted therefore a study was carried out from October 2016 to May 2017 to assess the knowledge, perception and experiences of farmers in the District on the occurrence and management of the tuber dry rot disease, isolate, identify and assess plant parasitic nematode genera Krachi Nchumuru District in yam fields and stored yam tubers; determine variation within and among population of Scutellonema. bradys using morphological and morphometric characteristics. -
Control Por Fosfato En La Biosíntesis Del Inmunosupresor Tacrolimus En Dos Especies Del Género Streptomyces
Universidad de León Departamento de Biología molecular INBIOTEC Instituto de Biotecnología de León Control por fosfato en la biosíntesis del inmunosupresor tacrolimus en dos especies del género Streptomyces MIRIAM MARTÍNEZ CASTRO LEÓN 2011 = = = A mis padres Agradecimientos La realización de esta tesis doctoral ha sido posible gracias a la ayuda, apoyo y ánimo que he recibido de muchas personas. El mundo de la ciencia es un mundo fascinante pero en ocasiones muy duro, momentos que se quedan en el olvido gracias al cariño que he sentido por muchos de los que me rodean. A Juan Francisco Martín, Director de esta Tesis, por haber confiado en mí al darme la oportunidad de realizar este trabajo bajo su dirección. A Carlos Barreiro, Co-director de esta Tesis y compañero, por todas tus enseñanzas y consejos pero sobre todo por la paciencia en los momentos de incertidumbre y desanimo. Gracias por enseñarme a poner en todo lo que hago un cuidado exquisito. Al Ministerio de Educación por haberme otorgado una beca predoctoral, así como la financiación para la realización de estancias en el extranjero y a la Universidad de León por ofrecerme el apoyo administrativo y de diversos recursos para la consecución de este trabajo. A todos los compañeros de Inbiotec por crear un ambiente de trabajo cálido; en general, siempre he recibido buenas palabras y disposición cuando he requerido ayuda o colaboración. En especial quiero dar las gracias a todas las personas que han pasado por mi “cuarto” con las que he compartido el trabajo del día a día codo con codo.