ROLE OF CERCOSPORIN TOXIN IN INDUCING SUGAR BEET LEAF SPOT | ||
| Journal of Plant Production | ||
| Article 20, Volume 28, Issue 2, February 2003, Pages 1017-1027 PDF (8.31 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2003.242451 | ||
| Author | ||
| Mona M. S. Nour-EI-Dln, | ||
| Plant Pathology Res.lnst. ARC, Gila, Egypt. | ||
| Abstract | ||
| Cercospora leaf spot is one of the most important widespread and destructive fungal diseases affecting sugar beet. The ability of most Cercospora isolates to cause disease is correlated with cercosporin toxin production. The yellow toxin first called (GF) for Gelben Fraktion, but now called (Cal) for Cercosoor« beticola toxin.ln vitro preliminary experiments showed the ability of some Cercospora isolates to form red and yellow pigments in culture media. Applying pigments exogenously to leaves, showed its toxIcity to sugar beet (Bets vulgaris L.), whereas, carcosporin necr08is lesions were similar to that lesions induced by the natural fungal infection. Factors influencing cercosponn In cullure have been studied. Results indicated that PDA medium was the most favorable medium for overall growth. Comparison of measured amounts of cercosporin produced on,different media confinned that malt medium was the most favorable tor (CST) production in all tested isolates, on which the highest level of cercosporin was harvested. Ught also plays an important role in growth, sporulation and toxin accumulation. The present study was concemed with the role of cercosporin toxin in inducing sugar beet leaf spot as well as the impact of bacterial toxin degradation as antimicrobial agent in disease control. The most efficient degraders were isolates of Xanthomona3 campestris pv. pruni or zinnia6. | ||
| Keywords | ||
| Beta vulgaris L; Cercospora betico/a Sacc .• cercosporin. Xanthomonas campestris | ||
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