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Research article - Peer-reviewed, 2021

Visualising the ionome in resistant and susceptible plant-pathogen interactions

Brouwer, Sophie M.; Lindqvist-Reis, Patric; Persson, Daniel P.; Marttila, Salla; Grenville-Briggs, Laura J.; Andreasson, Erik;

Abstract

At the morphological and anatomical levels, the ionome, or the elemental composition of an organism, is an understudied area of plant biology. In particular, the ionomic responses of plant-pathogen interactions are scarcely described, and there are no studies on immune reactions. In this study we explored two X-ray fluorescence (XRF)-based ionome visualisation methods (benchtop- and synchrotron-based micro-XRF [mu XRF]), as well as the quantitative inductively coupled plasma optical emission spectroscopy (ICP-OES) method, to investigate the changes that occur in the ionome of compatible and incompatible plant-pathogen interactions. We utilised the agronomically important and comprehensively studied interaction between potato (Solanum tuberosum) and the late blight oomycete pathogen Phytophthora infestans as an example. We used one late blight-susceptible potato cultivar and two resistant transgenic plant lines (only differing from the susceptible cultivar in one or three resistance genes) both in control and P. infestans-inoculated conditions. In the lesions from the compatible interaction, we observed rearrangements of several elements, including a decrease of the mobile macronutrient potassium (K) and an increase in iron (Fe) and manganese (Mn), compared with the tissue outside the lesion. Interestingly, we observed distinctly different distribution patterns of accumulation at the site of inoculation in the resistant lines for calcium (Ca), magnesium (Mg), Mn and silicon (Si) compared to the susceptible cultivar. The results reveal different ionomes in diseased plants compared to resistant plants. Our results demonstrate a technical advance and pave the way for deeper studies of the plant-pathogen ionome in the future.

Keywords

ionome; lateblight; phytophthora; plantpathogen; potato; XRF; technical advance

Published in

Plant Journal

2021, volume: 108, number: 3, pages: 870-885
Publisher: WILEY

Authors' information

Brouwer, Sophie
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Karlsruhe Institute of Technology
Persson, Daniel P.
University of Copenhagen
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Swedish University of Agricultural Sciences, Department of Plant Protection Biology

UKÄ Subject classification

Agricultural Science

Publication Identifiers

DOI: https://doi.org/10.1111/tpj.15469

URI (permanent link to this page)

https://res.slu.se/id/publ/113575