Transport213-page18 - can change during development and functioning of the cell Leaf cells have many plasmodesmata during development because they

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Transport in Plants - 18 Other Phloem Transport Revisiting the Symplast and Plasmodesmata When cell wall structure is discussed in biology, plasmodesmata, membrane channels between adjacent plant cells are described. Earlier in this section, the role of plasmodesmata in symplast movement of water in roots was also mentioned. In recent years, research on plasmodesmata had resulted in more information on these intercellular connections and their structure and function. The plasmodesmata are critical to the overall communication that maintains localized symplast domains within the plant. Environmental changes are rapidly transmitted through the dynamic symplast, particularly in relation to plant transport, and plasmodesmata appear to change in response to a number of signals. Plasmodesmata may open and close rapidly in response to turgor changes, pH and/or Ca ++ concentrations affecting symplast movement. The number of plasmodesmata
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Unformatted text preview: can change during development and functioning of the cell. Leaf cells have many plasmodesmata during development because they need solutes for cell maturation. Once mature, photosynthesis supplies the solutes and the number of plasmodesmata decreases. Research on mutant strains of Arabidopsis demonstrated that signals to initiate root hair development are normally transmitted cell-to-cell via plasmodesmata, or in this case, inhibition, since cessation of the signal molecule initiates root hair development. Recent studies on plant viral infections have shown the viral proteins can dilate plasmodesmata facilitating viral movement from cell to cell. The viral proteins are mimicking plant proteins that normally regulate plasmodesmata diameter. Investigating plasmodesmata and the symplast is just one area of active research on how plants communicate and the relationship of structure to function....
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.

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