Cambours, Marie-Anne
(2004).
Frost-related dieback of Swedish and Estonian Salix plantations due to pathogenic and ice nucleation-active bacteria.
Uppsala :
Sveriges lantbruksuniv.
ISBN 91-576-6637-7
[Licentiate thesis]
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Abstract
During the past decade, important dieback has been observed in short-rotation forestry plantations of Salix viminalis and S. dasyclados in Sweden and Estonia, plantations from which the isolation of ice nucleation-active (INA) and pathogenic bacteria has also been reported. This thesis investigates the connection between bacterial infection and frost as a possible cause for such damage, and the role played by internal and external factors (e.g. plant frost sensitivity, fertilisation) in the dieback observed. Bacterial floras isolated from ten Salix clones growing on fertilised/unfertilised mineral soil or nitrogen-rich organic soil, were studied. Culturable bacterial communities present both in internal necrotic tissues and on the plant surface (i.e. epiphytes) were isolated on two occasions (spring and autumn). The strains were biochemically characterised (with gram, oxidase and fluorescence tests), and tested for ice nucleation-activity. Their pathogenic properties were studied with and without association to a freezing stress. Certain strains were eventually identified with BIOLOG plates and 16S rRNA analysis. A high number of culturable bacterial strains was found in the plant samplings, belonging mainly to Erwinia and Sphingomonas spp.; pathogenic and INA communities being mostly Erwinia-, Sphingomonas- and Xanthomonas–like. The generally higher plant dieback noted in the field on nutrient-rich soils and for frost sensitive clones was found connected to higher numbers of pathogenic and INA bacteria in the plants. We thus confirm Salix dieback to be related to a synergistic effect of frost and bacterial infection, possibly aggravated by fertilisation.
Authors/Creators: | Cambours, Marie-Anne | ||||
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Title: | Frost-related dieback of Swedish and Estonian Salix plantations due to pathogenic and ice nucleation-active bacteria | ||||
Year of publishing : | August 2004 | ||||
Number of Pages: | 33 | ||||
Papers/manuscripts: |
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Place of Publication: | Uppsala | ||||
ISBN for printed version: | 91-576-6637-7 | ||||
Language: | English | ||||
Publication Type: | Licentiate thesis | ||||
Full Text Status: | Public | ||||
Agris subject categories.: | H Protection of plants and stored products > H20 Plant diseases F Plant production > F62 Plant physiology - Growth and development | ||||
Subjects: | Not in use, please see Agris categories | ||||
Agrovoc terms: | forest plantations, dieback, salix, frost damage, erwinia, pathogenicity, estonia, sweden | ||||
Keywords: | willow, freezing damage, ice formation, pathogenicity, frost resistance, fertiliser, Sphingomonas, Erwinia | ||||
URN:NBN: | urn:nbn:se:slu:epsilon-289 | ||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-289 | ||||
ID Code: | 597 | ||||
Department: | (NL, NJ) > Enheten för växtpatologi och biologisk bekämpning (fr.o.m. 990101) | ||||
Deposited By: | Marie-Anne Cambours | ||||
Deposited On: | 17 Aug 2004 00:00 | ||||
Metadata Last Modified: | 02 Dec 2014 10:05 |
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