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Long-distance solute transport in trees improved by intercellular pathways in living woody tissues
Date:12/7/2012

in the cell walls of the secondary xylem, it was not visible in the cambial primary cell walls. This, together with the presence of the symplasmic dye in the cambial cells and in axial and radial xylem parenchyma, indicates the importance of the symplasmic pathway for transporting substances from the living xylem cells to the actively dividing cambial cells, which are crucial for developing new cells and tissues.

One of the most surprising and interesting finds was that the dye was not evenly dispersed throughout the cells despite the regular arrangement of rays in the cambium.

"We found that when fluorescent tracers are loaded to tree branches and migrate freely in the system of living cells, the tracer distribution becomes uneven," commented Sokołowska. "The regions appear with a high and low tracer content in the cells and they alternate along the branches. The pattern emerges in cambium, an embryonic tissue responsible for thickening of a tree through making its secondary conductive tissues, such as wood."

Father up from the source of the dye, the branch regions of rays filled with dye alternated with regions of rays that did not contain the dyeboth dye and non-dye rays were composed of living cells with vigorous cytoplasmic streaming. The authors suggest that this pattern could be the result of differences in regulating the intensity of movement and unloading of dye from xylem to cambial cells in different areas.

"Most importantly, this regulation at the cellular level has a potential, through the spatial shift of the cellular states, of propagating important information in the whole population of interconnected plant cells over long-distancessimilar to the green wave of streetlights for driving cars," Sokołowska stated.

In addition, this long-distance symplasmic movement from the xylem into the cambial rays is of utmost importance because the cambial cells are zones of active cell production and the
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Contact: Richard Hund
rhund@botany.org
314-577-9557
American Journal of Botany
Source:Eurekalert  

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