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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

DOI: 10.1080/01140671.1993.9513743

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Related references

Hattingh M.J.; Beer S.V.; Lawson E.W., 1986: Scanning electron microscopy of apple blossoms colonized by erwinia amylovora and erwinia herbicola. Based on scanning electron microscopy of apple blossoms sprayed with suspensions of E. herbicola (strains 159 and 252) and E. amylovora (strain 273), we found these strains multiplied mostly on the stigmatic surface. E. herbicola 252, which effect...

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