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Arbuscular mycorrhizal fungi

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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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
Title:Arbuscular mycorrhizal fungi
Subtitle:occurrence in Sweden and interaction with a plant pathogenic fungus in barley
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2005
Number of Pages:53
ALLI. Sjöberg J., Persson P., Mårtensson A., Mattsson L., Adholeya A. & Alström S. 2004. Occurrence of Glomeromycota spores and some arbuscular mycorrhiza fungal species in arable fields in Sweden. Acta Agriculturae Scandinavica, Section B, Soil and Plant Science 54, 202-212. II: Sjöberg J., Mårtensson A. & Persson P. Development of seed-borne Bipolaris sorokiniana in barley in the presence of field populations of arbuscular mycorrhizal fungi. European Journal of Plant Pathology (Accepted after minor revision). III. Sjöberg J. The plant pathogenic fungus Bipolaris sorokiniana inhibits arbuscular mycorrhizal fungi which in turn suppress disease development in barley. Mycorrhiza (Submitted).
Place of Publication:Uppsala
ISBN for printed version:91-576-7032-3
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
Permanent URL:
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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