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Comparison of Malus infection by the pathogen Erwinia amylovora and colonisation by the saprophyte Erwinia herbicola by electron microscopy



Comparison of Malus infection by the pathogen Erwinia amylovora and colonisation by the saprophyte Erwinia herbicola by electron microscopy



New Zealand Journal of Crop & Horticultural Science 21(1): 33-38



Erwinia amylovora infection of either apple stem or leaf tissue resulted in xylem occlusion by a fibrillar matrix material, determined by Thiery's thiocarbohydrazide (TCH) test to be the extracellular polysaccharide from E. amylovora. Plasmolysis of the xylem-parenchyma was also detected and was most likely a result of a toxin produced by the pathogen. This plasmolysis resulted in the collapse and death of the cell. An Erwinia herbicola isolate which had previously expressed inhibitory effects on E. amylovora was contained at the site of inoculation.

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Accession: 002328001

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DOI: 10.1080/01140671.1993.9513743



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