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- W2050117900 abstract "Whilst the structure of higher plant plasmodesmata was first described by Robards (1963. Desmotubule-a plasmodesmatal substructure. Nature 218, 784), and despite many subsequent intensive investigations, there is still much that remains unclear relating to their ultrastructure and functioning in higher plants. We have examined chemically fixed plant material, and suggest that the conformational changes seen in plasmodesmatal substructure, particularly the deposition of electron-dense extra-plasmodesmal material, is linked to either manipulation of the hormonal balance (as in Avocado fruit), or of osmotic potential in leaf blade material. These changes result in the deposition of beta 1,3-glucan (callose) at the neck region of these plasmodesmata. This electron-dense material is deposited at the neck region of plasmodesmata, and forms a collar-like structure. The formation of a collar is shown to be coupled with loss of lucence within the cytoplasmic sleeve. The formation of a collar at the plasmodesmatal orifice thus results in encapsulation and closure of the plasmodesmatal orifice. Closure of the orifice coincides with a loss of electron-lucence and a lack of resolution of the desmotubule. These ultrastructural changes are potentially significant and could contribute to, result in, or assist in the down-regulation of cell to cell trafficking via plasmodesmata." @default.
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- W2050117900 date "2000-12-01" @default.
- W2050117900 modified "2023-09-23" @default.
- W2050117900 title "Towards reconciliation of structure with function in plasmodesmata—who is the gatekeeper?" @default.
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- W2050117900 doi "https://doi.org/10.1016/s0968-4328(99)00108-0" @default.
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