Reactions of white cabbage (Brassica oleracea var. capitata) to four different strains of turnip mosaic virus

Abstract

TuMV strains isolated in the UK, Germany, Denmark and Greece have been shown to be biologically distinct by host range studies. The effects of the four strains on symptoms, yield and storage performance of four cultivars of white cabbage were assessed in gauze house experiments. Three of the cultivars, Decema Extra, Vitala and Winter White 111, were known to have high levels of resistance to the UK strain and the fourth, cv. Polinius, is known to be highly susceptible. The resistance to the UK strain previously observed in the three 'resistant cultivars' was generally effective against the other three strains; however, the level of resistance was virus strain dependent and variable for the symptoms of external necrosis, internal necrosis and yield depression. The UK strain caused the highest level of external necrosis and the German strain the highest internal necrosis. These two strains generally caused greater yield reductions than the Danish or Greek strains. Virus infection had no effect upon the incidence of the pepper-spot necrosis disorder. Breeding strategies for handling the observed resistance are discussed. 17-20. Pjlanzenschutzdienst (Braunschweig) 33,

Pathotypic variation in turnip mosaic virus with special reference to European isolates

“…Break & Break (1980) studied the quantitative interaction of 23 isolates with 11 different host plants only one of which was a crucifer. Similar quantitative differences were described in different B. oleracea types by Walkey & Pink (1988). The Chinese strain identification system of Liu et al (1990b), based on cumulative data on the quantitative interaction between TuMV and six cruciferous hosts, identified seven strains, Tu 1-7.…”

Inheritance of resistance to turnip mosaic virus in Chinese cabbage

“…Yield losses due to TuMV are severe and have been widely reported (Ahlawat & Chenulu, 1984 ;Walkey & Pink, 1988 ;Walsh & Tomlinson, 1985). Because of the non-persistent mode of transmission of the virus by its aphid vectors, insecticides are not very useful for control .…”

“…Host resistance, however, is thought to be the only practical and effective means of control and is widely pursued in Asian countries (Ahlawat & Chenulu, 1984 ;Green & Deng, 1985 ;Green, 1991 ;Lim et al ., 1978 ;Sheen & Wang, 1982) . However, occurrence of strains of the virus (Provvidenti, 1980 ;Green & Deng, 1985 ;Li, 1989 ;Chiu, 1988 ;Walkey & Pink, 1988 ;Yoshii, 1963) has greatly hampered such programs (Green & Deng, 1985 ;AVRDC, 1984) .…”

Verbesserung der Krankheitsresistenz von Kohlgem�se: 1. Turnip mosaic virus(TuMV)

“…Nach einer vierwöchigen Kultur der inokulierten Pflanzen unter Gewächshaus-bzw. Freilandbedingungen erfolgte eine visuelle Symptombonitur in Anlehnung an Walkey & Pink (1988). Die relative Viruskonzentration wurde mit einem polyklonalen Antiserum (BAZ, Institut für Resistenzforschung und Pathogendiagnostik, Aschersleben) im DAS-ELISA (Double Antibody Sandwich Ϫ Enzyme Linked Immunosorbent Assay) nach Clark & Adams (1977) bestimmt.…”

“…Die Resistenzevaluierungen innerhalb der Familie der Brassicaceae haben gezeigt, dass die im Anbau befindlichen Kohlgemüse überwiegend anfällig gegen das Turnip mosaic virus (TuMV) sind (Walkey & Pink 1988, Krämer et al 1995 ist es zur Vermeidung von Ertrags-und Qualitätsverlus-ten notwendig, die Resistenz gegen dieses Virus zu verbessern (Hunter et al 2002, Krämer et al 2003 …”