Plant–environment microscopy tracks interactions of Bacillus subtilis with plant roots across the entire rhizosphere

Yangminghao Liu, Daniel Patko, Ilonka Engelhardt, Timothy S. George, Nicola R. Stanley-Wall, Vincent Ladmiral, Bruno Ameduri, Tim J. Daniell, Nicola Holden, Michael P. MacDonald*, Lionel X. Dupuy

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

Our understanding of plant–microbe interactions in soil is limited by the difficulty of observing processes at the microscopic scale throughout plants’ large volume of influence. Here, we present the development of three-dimensional live microscopy for resolving plant–microbe interactions across the environment of an entire seedling growing in a transparent soil in tailor-made mesocosms, maintaining physical conditions for the culture of both plants and microorganisms. A tailor-made, dual-illumination light sheet system acquired photons scattered from the plant while fluorescence emissions were simultaneously captured from transparent soil particles and labeled microorganisms, allowing the generation of quantitative data on samples ∼3,600 mm3 in size, with as good as 5 µm resolution at a rate of up to one scan every 30 min. The system tracked the movement of Bacillus subtilis populations in the rhizosphere of lettuce plants in real time, revealing previously unseen patterns of activity. Motile bacteria favored small pore spaces over the surface of soil particles, colonizing the root in a pulsatile manner. Migrations appeared to be directed toward the root cap, the point of “first contact,” before the subsequent colonization of mature epidermis cells. Our findings show that microscopes dedicated to live environmental studies present an invaluable tool to understand plant–microbe interactions.
Original languageEnglish
Title of host publicationProceedings of the National Academy of Sciences of the United States of America
Volume118
Edition48
DOIs
Publication statusPrint publication - 30 Nov 2021

Publication series

NameProceedings of the National Academy of Sciences of the United States of America
PublisherNational Academy of Sciences
ISSN (Print)0027-8424

Keywords

  • environmental imaging
  • rhizosphere
  • root–microbe interactions

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