Lipopolysaccharides of plant-growth promoting Pseudomonas sp. strain WCS417r induce resistance in carnation to Fusarium wilt |
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| Authors: | R Van Peer B Schippers |
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| Institution: | (1) Present address: Cyanamid, International Agricultural Division, Rue du Bosquet 15, B-1348 Louvain-la Neuve, Belgium;(2) Department of Plant Ecology and Evolutionary Biology, Section Plant Pathology, Utrecht University, Sorbonnelaan 16, 3584 CA Utrecht, the Netherlands |
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| Abstract: | The numbers of diseased plants could significantly be reduced when microconidia ofFusarium oxysporum f. sp.dianthi were inoculated into the stem and viable-, heat-killed cells or purified LPS of the bacteriumPseudomonas sp. strain WCS417r were applied to the roots. Because the competition betweenF. o. dianthi and the bacterium could be excluded, the disease suppression seems to be due to an induced resistance. Accumulation of phytoalexins was found in the stem segments. No accumulation of these compounds was found when the plants were bacterized but noninfected. It is concluded that cell surface components present in the lipopolysaccharides of the bacterium are the inducing factors.Increased peroxidase activity could be measured in root washes and root extracts after only bacterial preparations were added. No significant differences in peroxidase activity were found in stem extracts. The possible role of increased peroxidase activity in suppression of Fusarium wilt in carnation is discussed. |
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| Keywords: | carnation induced resistance lipopolysaccharides peroxidase Pseudomonas |
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