Journal
NEW PHYTOLOGIST
Volume 230, Issue 4, Pages 1321-1328Publisher
WILEY
DOI: 10.1111/nph.17182
Keywords
endodermis; nutrient uptake; passage cells; plant– microbe interactions; root development
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Funding
- Alexander von Humboldt Foundation
- Max Planck Society
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Researchers have recently begun to investigate the role of passage cells in the root system, which is crucial for understanding how roots communicate with the environment. Further research on passage cells may provide new tools for improving overall plant health.
The endodermis surrounds and protects the vasculature partly by depositing hydrophobic suberin in the cell walls. Yet, some cells remain unsuberised. These historically termed 'passage cells' are assumed to provide a low-resistance pathway to the xylem. Only recently have we started to gain molecular insights into these cells, which allow us to probe how roots coordinate communication with the environment across barriers with single-cell precision. Increased understanding of root physiology at a high-resolution is intriguing, as it is likely to provide us with new tools to improve overall plant health. With this in mind, we here provide a brief overview of passage cells, their presence across plant species, as well as a molecular update and future directions for passage cell-related research.
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