Transport Through Plasmodesmata via the Endoplasmic Reticulum

The ER-desmotubule-ER continuum provides three potential routes for cell-to-cell transport via plasmodesmata: (1) by passive flow within the desmotubule lumen; (2) by diffusion along the inner desmotubule membranes; or (3) by specific attachment of molecules to the cytoplasmic face of the desmo-tubule, followed by facilitated transport through the cytoplasmic sleeve. The last of these will be covered in Sect. 4.2.3, dealing with selective transport between sieve element and companion cell.

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