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Powdery mildew pathogenesis of Arabidopsis thaliana



Powdery mildew pathogenesis of Arabidopsis thaliana



Mycologia 90(6): 1009-1016



A powdery mildew (Erysiphales) infection of Arabidopsis thaliana was found in the greenhouse of the Department of Molecular Biology at Massachusetts General Hospital (MGH isolate). We studied the structure of the anamorph, the sequence and chronology of its development, and its virulence on A. thaliana and other hosts. The teleomorph of the fungus was not found on the material we examined. The MGH isolate caused severe powdery mildew symptoms on some A. thaliana accessions, infecting rosette and cauline leaves, stems and siliques, but was practically avirulent on others. Previously, two Erysiphales have been reported to infect A. thaliana. These were identified as Erysiphe cichoracearum (UCSC isolate) and E. cruciferarum (UEA isolate). The MGH isolate was found to be a member of the E. cichoracearum group in the section Golovinomyces. It can be distinguished from both of these previously described powdery mildews of A. thaliana based on the morphology, host range and virulence. It might be best referred to E. orontii following the system proposed by Braun.

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Accession: 003237505

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DOI: 10.2307/3761274



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