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Suppression Of The Bacterially Induced Hypersensitive Reaction By Cytokinins

A. Novacký
Published 1972 · Biology

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Abstract Development of the bacterially induced hypersensitive reaction was overcome when tobacco leaves were pretreated with 5 × 10−5 m -kinetin, or other compounds with cytokinin activity, 48 h before inoculation with Pseudomonas pisi. Bacterial growth in the treated tissue was not affected. Developmental stage of the treated leaves was critical for demonstrating the protective effect of cytokinin. Only older leaves approaching senescence exhibited this effect. Development of symptoms of wildfire disease caused by Pseudomonas tabaci were delayed by cytokinin treatment, but 72 h after inoculation both water (control) and cytokinin-treated leaves exhibited the same degree of necrosis.
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