Reactions of white cabbage ( Brassica oleracea var. capitata ) to four different strains of turnip mosaic virus
1988; Wiley; Volume: 112; Issue: 2 Linguagem: Inglês
10.1111/j.1744-7348.1988.tb02063.x
ISSN1744-7348
Autores Tópico(s)Plant-Microbe Interactions and Immunity
ResumoSUMMARY 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 III, 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.
Referência(s)