Trichodorid vectors of serologically distinguishable strains of tobacco rattle tobravirus occurring in Germany and the use of antagonistic plants to suppress spraing disease in potato [Elektronische Ressource] / vorgelegt von Christiane Petz

Trichodorid vectors of serologically distinguishable strains of tobacco rattle tobravirus occurring in Germany and the use of antagonistic plants to suppress „spraing“ disease in potato Dissertation zur Erlangung des Doktorgrades des Fachbereichs Biologie der Universität Hamburg vorgelegt von Christiane Petz aus Hamburg Hamburg 2003 I II III CONTENTS page 1 I INTRODUCTION 1 I.A The Tobraviruses 1 I.A.1 Background 2 I.A.2 Properties and characteristics of the Tobravirus genus 6 I.A.3 Genetic determinants of vector transmissibility 7 I.A.4 Identification of Tobravirus isolates 8 I.A.5 Host range and plant diseases 14 I.A.6 Virus-spread within plants and between plant generations 16 I.B The Family Trichodoridae 16 I.B.1 Systematics and taxonomy 18 I.B.2 General morphology 20 I.B.3 Life Cycle 21 I.B.4 Feeding behaviour I.B.4.a Root cell and tissue responses 23 24 I.B.5 Host range 25 I.B.6 Ecology and distribution 27 I.C The Tobravirus-Trichodorid Association 28 I.C.1 General remarks 29 I.C.2 Transmission specificity 31 I.C.3 Exclusivity and complementarity 31 I.C.4 Transmission efficiency 33 I.C.5 Retention and dissociation of tobravirus particles in the vector 34 I.D Control Measures 35 I.D.1 Chemical 37 I.D.2 Cultural 38 I.E Research Objectives 38 I.E.