Effect of Erwinia amylovora infection in biochemical changes of different pear fruits

K. Honty, M. Hevesi, M. Tóth, É Sárdi, É Stefanovits-Bányai

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this recent study we have investigated the consequences of E. amylovora infection of pear fruits. Inoculations were made with a mixture of pear isolates (Ea 21, 23; at a density of 5 × 108 cells/ml) collected from various growing regions of Hungary. The change of concentration in time of different carbohydrate fractions (mainly glucose, fructose and sucrose) in unripe pear fruits of different cultivars in connection with disease development was measured using the OPLC method. Peroxidase enzyme activity was also measured in the samples during the disease process. Samples (unripe fruit flesh cutouts - 1 cm 0) were taken from the inoculation point and neighboring tissues during seven day intervals. Host responses showed significant differences. We have concluded that among the three well-detectable carbohydrate fractions, glucose and sucrose were the best markers of the disease process. The concentration of glucose was higher in the susceptible uninfected control ('Max Red Bartlett') tissues than in the resistant ones ('Vicar of Winkfield') and it decreased after the infection in a different way. Increase in peroxidase enzyme activity started to occur on the first day after inoculation (DAI) in the susceptible cultivar, while the change was detectable only 2 DAI in resistant fruits. It was a suitable marker of the susceptible and resistant host responses.

Original languageEnglish
Title of host publicationProceedings of the 10th International Pear Symposium
PublisherInternational Society for Horticultural Science
Number of pages6
ISBN (Print)9789066056114
Publication statusPublished - Jan 1 2008
Event10th International Pear Symposium - Peniche, Portugal
Duration: May 22 2007May 26 2007

Publication series

NameActa Horticulturae
Volume800 PART 2
ISSN (Print)0567-7572


Other10th International Pear Symposium


  • Bacterial infection
  • Erwinia amylovora
  • Glucose
  • Peroxidase
  • Resistant
  • Sucrose
  • Susceptible pear fruit

ASJC Scopus subject areas

  • Horticulture

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    Honty, K., Hevesi, M., Tóth, M., Sárdi, É., & Stefanovits-Bányai, É. (2008). Effect of Erwinia amylovora infection in biochemical changes of different pear fruits. In Proceedings of the 10th International Pear Symposium (pp. 879-884). (Acta Horticulturae; Vol. 800 PART 2). International Society for Horticultural Science. https://doi.org/10.17660/ActaHortic.2008.800.119