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Crown-gall disease; Catalase; Plant bioassay; Common sunflower


Crown gall is a neoplastic disease in plants initiated by a specific bacterium, Agrobacterium tumefaciens. The objective of this investigation was to describe quantitatively the relationship between the autonomous growth of crown galls and the activity of the metabolic enzyme catalase. The catalase bioassay revealed a substantial increase In the amount of catalase present in tumor tissues as compared to corresponding healthy tissues in Helianthus annuus. Observations concerning growth activity of the two tissues indicated a significant growth increase in the crown galls.

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