Bacteria associated with Stagonospora (Septoria) nodorum increase pathogenicity of the fungus

In studies with a laboratory isolate of the fungal pathogen Stagonospora (Septoria) nodorum three different isolates of bacteria were closely associated with the fungus. Bacteria were also closely associated with fresh isolates of S. nodorum obtained from artificially and naturally infected field ma...

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Bibliographic Details
Published in:The New phytologist 1999-12, Vol.144 (3), p.489-497
Main Authors: DEWEY, F. M., WONG, Y. LI, SEERY, R., HOLLINS, T. W., GURR, S. J.
Format: Article
Language:English
Subjects:
Bacteria
Bacterial spores
Biological and medical sciences
Chemical suspensions
Enterobacter
Enterobacter agglomerans
Erwinia amylovora
Fundamental and applied biological sciences. Psychology
fungal pathogen
Fungal plant pathogens
Fungal spores
Fungi
helper bacteria
infection
Infections
leaves
Leptosphaeria nodorum
Lesions
mixed infection
Pantoea agglomerans
pathogenicity
Pathology, epidemiology, host-fungus relationships. Damages, economic importance
Phytopathology. Animal pests. Plant and forest protection
Plants
Pseudomonas
Sphingobacterium multivorum
Stagonospora (Septoria) nodorum
Stagonospora nodorum
Stenotrophomonas maltophilia
Triticum aestivum
Triticum aestivum (wheat)
virulence
Xanthomonas maltophilia
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Summary:In studies with a laboratory isolate of the fungal pathogen Stagonospora (Septoria) nodorum three different isolates of bacteria were closely associated with the fungus. Bacteria were also closely associated with fresh isolates of S. nodorum obtained from artificially and naturally infected field material. Although a range of bacteria was isolated, only one type of bacterium was found to be associated with each isolate of S. nodorum. In co-inoculation studies with pycnidiospores of the fungus on detached leaves, some of the bacterial isolates significantly increased the pathogenicity of the fungus, particularly Xanthomonas maltophilia, Sphingobacterium multivorum, Enterobacter agglomerans and Erwinia amylovora. Evidence is presented indicating that one of the ways that the ‘helper bacteria’ may assist in the establishment of infections is by the production of lipases that were not detected in germinating fungal spores.
ISSN:0028-646X
1469-8137
DOI:10.1046/j.1469-8137.1999.00542.x