, Volume 21, Issue 5, pp 341–349 | Cite as

Impact of arbuscular mycorrhizal fungi on the allergenic potential of tomato

  • Dietmar SchwarzEmail author
  • Saskia Welter
  • Eckhard George
  • Philipp Franken
  • Karola Lehmann
  • Wolfram Weckwerth
  • Sabine Dölle
  • Margitta Worm
Original Paper


Arbuscular mycorrhizal (AM) fungi influence the expression of defence-related genes in roots and can cause systemic resistance in plants probably due to the induced expression of specific defence proteins. Among the different groups of defence proteins, plant food allergens were identified. We hypothesized that tomato-allergic patients differently react to tomatoes derived from plants inoculated or not by mycorrhizal fungi. To test this, two tomato genotypes, wild-type 76R and a nearly isogenic mycorrhizal mutant RMC, were inoculated with the AM fungus Glomus mosseae or not under conditions similar to horticultural practice. Under such conditions, the AM fungus showed only a very low colonisation rate, but still was able to increase shoot growth of the wild-type 76R. Nearly no colonisation was observed in the mutant RMC, and shoot development was also not affected. Root fresh weights were diminished in AM-inoculated plants of both genotypes compared to the corresponding controls. No mycorrhizal effects were observed on the biomass and the concentration of phosphate and nitrogen in fruits. Real-time quantitative polymerase chain reaction analysis revealed that six among eight genes encoding for putative allergens showed a significant induced RNA accumulation in fruits of AM-colonised plants. However, human skin reactivity tests using mixed samples of tomato fruits from the AM-inoculated and control plants showed no differences. Our data indicate that AM colonisation under conditions close to horticultural practice can induce the expression of allergen-encoding genes in fruits, but this does not lead necessarily to a higher allergenic potential.


Allergy Defence proteins Glomus mosseae RNA accumulation Skin prick test 



This research was supported by the Ministries of Consumer Protection, Food and Agriculture of the Federal Republic of Germany, of the Land Brandenburg and of the Land Thüringen. The authors express their thanks to Kerstin Fischer (IGZ), Gundula Aust (IGZ) and Eva-Maria Fiedler (Charité) for their valuable help in conducting and analyzing the experiments.


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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Dietmar Schwarz
    • 1
    Email author
  • Saskia Welter
    • 1
  • Eckhard George
    • 1
  • Philipp Franken
    • 1
  • Karola Lehmann
    • 2
  • Wolfram Weckwerth
    • 3
  • Sabine Dölle
    • 4
  • Margitta Worm
    • 4
  1. 1.Leibniz-Institute of Vegetable and Ornamental CropsGrossbeerenGermany
  2. 2.Proteome Factory AGBerlinGermany
  3. 3.Department Molecular Systems Biology, Faculty of Life ScienceUniversity of ViennaViennaAustria
  4. 4.Department of Dermatology and AllergologyCharité—Universitätsmedizin BerlinBerlinGermany

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