AI Article Synopsis
- Plasmodesmata (PD) are tiny channels in plant cells that allow for the transport of molecules between cells, and their permeability is crucial for various plant functions such as growth and defense against pathogens.
- Callose deposition can affect PD transport, but the process of PD closure during tissue damage or stress is not well understood, prompting research into how this happens quickly.
- The proposed mechanism suggests that pressure forces on the ER-desmotubule complex trigger a closure of PD by displacing it from its normal position, with protein tethers being key in deciding how selective the PD pore is, and this model aligns well with experimental observations.
Article Abstract
In plants, plasmodesmata (PD) are nanopores that serve as channels for molecular cell-to-cell transport. Precise control of PD permeability is essential to regulate processes such as growth and tissue patterning, photoassimilate distribution and defense against pathogens. Callose deposition modulates PD transport but little is known of the rapid events that lead to PD closure in response to tissue damage or osmotic shock. We propose a mechanism of PD closure as a result of mechanosensing. Pressure forces acting on the dumbbell-shaped ER-desmotubule complex cause it to be displaced from its equilibrium position, thus closing the PD aperture. The filamentous protein tethers that link the plasma membrane to the ER-desmotubule complex play a key role in determining the selectivity of the PD pore. This model of PD control compares favorably with experimental data on the pressure-generated closure of PD.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6687729 | PMC |
| http://dx.doi.org/10.1038/s41467-019-11201-0 | DOI Listing |
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