Occurrence, spread and pathogenicity of different beet necrotic yellow vein virus (BNYVV) isolates [Elektronische Ressource] = Vorkommen, Verbreitung und Pathogenität verschiedener Isolate des Beet necrotic yellow vein virus (BNYVV) / vorgelegt von Friederike Pferdmenges

Occurrence, spread and pathogenicity of different Beet necrotic yellow vein virus (BNYVV) isolates Vorkommen, Verbreitung und Pathogenität verschiedener Isolate des Beet necrotic yellow vein virus (BNYVV) Dissertation zur Erlangung des Doktorgrades der Fakultät für Agrarwissenschaften der Georg-August-Universität Göttingen vorgelegt von Friederike Pferdmenges geboren in Einbeck Göttingen, im September 2007 D7 1. Referent: Prof. Dr. Mark Varrelmann 2. Koreferent: Prof. Dr. Heiko Becker 3. Prüferin (Disputation): Prof. Dr. Elke Pawelzik Tag der mündlichen Prüfung: 15.11.2007 ABSTRACT Rhizomania (beet necrotic yellow vein virus, BNYVV) represents an important sugar beet disease, which is transmitted by the biotrophic plasmodiophoromycete Polymyxa betae. As long as the disease is not controlled it can lead to yield losses up to 90%. To date yield losses due to BNYVV infestation are inhibited by cultivating resistant sugar beet genotypes, which restrict the virus replication and translocation from infected hair-roots to the taproot. The BNYVV resistance is provided in marketable sugar beet varieties by two major resistance sources (Rz1 and Rz2 which either occur singular or in combination).