Abstract
AbstractTwo methods are proposed to evaluate rust and eye spot disease resistance in sugarcane using biochemical criteria.Eye spot disease resistance is easily evaluated by a fast conductimetric bioassay of high sensitivity. If desired, the conductimetric values may be converted into grades of field resistance by means of a regression graph based on standard varieties. The main advantages of this method art it's complete objectivity, reproducibility and independence of climatic conditions.It was also found that susceptibility of sugarcane to rust can be recognized very early in the infection process by a striking increment of peroxidase activity. The simplicity of this enzyme reaction, which can easily be automated and the speed of detection during infection are discussed as an option for rust resistance evaluation.
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