Submitted to: Plant Physiology
Publication Type: Abstract Only
Publication Acceptance Date: 6/28/1998
Publication Date: N/A
Technical Abstract: Leaf spot disease of sugarbeet caused by Cercospora beticola Sacc. is the most devastating foliar disease of sugarbeet in the U.S. and is found in sugarbeet production areas world-wide. Several classes of non-host-specific phytotoxins are implicated in the pathogensis of sugarbeet by C. Beticola, the best studied being the photoactivated toxin cercosporin. Although resistance in sugarbeet to common races of C.Beticola is not characterized by a hypersensitive response, the induced synthesis of several pathogenesis-related proteins (PR-proteins) and the activities of beta-1, 3-glucanase and chitinase in infected susceptible sugarbeet varieties has been reported (Limouzin-Rousseau and Fritig, Plant Physiology and Biochemistry, V29, pp 105-117, 1991). In the present study the accumulation of peroxidase and phosphatase isozymes in response to infection by C. Beticola was examined in sugarbeet varieties both susceptible and moderately resistant to leaf spot disease. The data suggests the both activities are modulated by C. Beticola infection at both the total activity and individual isozyme level.