occurrence in Sweden and interaction with a plant pathogenic fungus in barley
Sjöberg, Johanna
(2005).
Arbuscular mycorrhizal fungi.
Diss. (sammanfattning/summary)
Uppsala :
Sveriges lantbruksuniv.,
Acta Universitatis Agriculturae Sueciae, 1652-6880
; 2005:33
ISBN 91-576-7032-3
[Doctoral thesis]
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Abstract
The potential disease suppressiveness of arbuscular mycorrhizal (AM) fungi of various origins on Bipolaris sorokiniana in barley has been investigated. Firstly, a survey considering the occurrence of AM fungi in arable fields in Sweden were conducted with the aim to exploit site specific genetic resources in relation to disease suppressiveness. Arbuscular mycorrhizal fungi were present at all 45 sampling sites surveyed all over Sweden at densities ranging from 3 up to 44 spores per gram air dried soil. The highest spore density was found in a semi-natural grassland and the lowest were found in a cereal monoculture. The AM fungi were then multiplied in trap cultures in the greenhouse with the aim to use these for studying potential disease suppressiveness. Thus, the effects of the AM fungi trap cultures on the transmission of seed-borne B. sorokiniana in barley were investigated, using the trap culture inocula, but also including inocula consisting on spore mixtures. The arbuscular mycorrhizal fungi were able to suppress the transmission of B. sorokiniana in aerial parts of barley plants. The degree of suppression varied with the origin of the AM fungal trap cultures. The trap culture inoculum with the highest suppression of the B. sorokiniana transmission originated from an organically managed barley field with undersown ley. The two spore-inocula with the best suppression of the pathogen originated from fields with winter wheat and spring barley, respectively. Eventually, an in vitro method was developed for studying the effect of AM fungal colonisation of roots on the development of foliar diseases and the reaction of the actual host plant of the disease causing organism. Using the developed method, it was indicated that AM fungal colonisation of barley plant suppressed the development of leaf necroses due to B. sorokiniana. Further in vitro studies on the interaction between B. sorokiniana and arbuscular mycorrhizal fungi showed that B. sorokiniana decrease the germination of the AM fungal spores. In conclusion, AM fungi suppress the development of B. sorokiniana in barley. My data suggest that for biocontrol of B. sorokiniana AM fungi should be considered.
Authors/Creators: | Sjöberg, Johanna | ||||
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Title: | Arbuscular mycorrhizal fungi | ||||
Subtitle: | occurrence in Sweden and interaction with a plant pathogenic fungus in barley | ||||
Year of publishing : | 2005 | ||||
Number: | 2005:33 | ||||
Number of Pages: | 53 | ||||
Papers/manuscripts: |
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Place of Publication: | Uppsala | ||||
ISBN for printed version: | 91-576-7032-3 | ||||
ISSN: | 1652-6880 | ||||
Language: | English | ||||
Publication Type: | Doctoral thesis | ||||
Full Text Status: | Public | ||||
Agris subject categories.: | F Plant production > F40 Plant ecology H Protection of plants and stored products > H20 Plant diseases | ||||
Subjects: | Not in use, please see Agris categories | ||||
Agrovoc terms: | barley, cochliobolus sativus, fungi, fungal spores, root rots, biological control, sweden | ||||
Keywords: | Biocontrol, Bipolaris sorokiniana, Glomeromycota, Common root rot, Spot blotch | ||||
URN:NBN: | urn:nbn:se:slu:epsilon-726 | ||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-726 | ||||
ID Code: | 921 | ||||
Department: | (NL, NJ) > Dept. of Crop Production Ecology | ||||
Deposited By: | Johanna Sjöberg | ||||
Deposited On: | 12 Sep 2005 00:00 | ||||
Metadata Last Modified: | 02 Dec 2014 10:08 |
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