Plants may reuse cell-division machinery to host fungi or fight germs
Guo H, Zhai L, Yu N, Wang E
Mycorrhizal Networks
The fuzzy white threads you spot on tomato roots or around a mushroom's base are part of a nutrient-swapping partnership, and this research suggests the plant cell literally pauses its division clock to build the special membranes that make that trade possible.
When plants team up with helpful fungi underground or get invaded by disease-causing microbes, their cells have to build special membrane structures to move nutrients or fend off attack. This review suggests plants borrow the same cell-division toolkit for both jobs: friendly fungi get cells that copy their DNA without fully dividing (making bigger, more productive cells), while harmful germs get blocked by cells that tighten their division checkpoints to wall off resources. Understanding this shared toolkit could one day help breeders boost beneficial plant-fungus partnerships or strengthen disease resistance.
Key Findings
Biotrophic pathogens reprogram host cell cycle pathways to create metabolically favorable infection niches, while plant immune responses use cell cycle checkpoints to restrict resources and reinforce barriers
In arbuscular mycorrhizal symbiosis, host cells undergo localized endoreduplication (DNA replication without division), proposed as a 'metabolic amplification program' to increase biosynthetic capacity
Root nodule symbiosis and mycorrhizal symbiosis appear to share cellular programs for accommodating microbes, suggesting cell cycle regulation could be a common, tunable target for improving symbiosis or disease resistance
chevron_right Technical Summary
Scientists propose that plants rewire their cells' division cycle to handle both helpful fungal partnerships and harmful infections, giving infected cells the extra capacity to build specialized membranes for nutrient exchange or defense.
Abstract Preview
Original paper
Cell cycle reprogramming in plant symbiotic and pathogenic interactions.
Intracellular plant-microbe interactions rely on host-derived interface membranes: as sites for reciprocal nutrient and signal exchange during symbiosis, or as conduits for asymmetrical nutrient ac...
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