Morphogenesis of Tracheary Elements and Guard Cells
Plant cell shape is determined by the cell wall. The pattern and orientation of the reinforcing cellulose microfibrils of the wall define the manner and places in which a cell will strain in response to the internally generated turgor stress (Green 1980). To understand morphogenesis one must explain the mechanism of cell wall formation and in particular how unique patterns of cellulose reinforcements arise. Two cell types that possess specific wall patterns related to cell shape and function, and that have received considerable attention in studies of cytomorphogenesis are tracheary elements and stomatal guard cells (Hepler and Palevitz 1974). Despite their obvious differences in overall shape and function they possess remarkable similarities in the structure of their secondary wall and in the apparent manner by which the wall develops. It is the purpose of this chapter to consider the mechanism of secondary wall formation in differentiating tracheary elements and guard cells and to focus especially on those structures and processes at the cell wall-cyto- plasmic interface that seems to be responsible for Controlling the location of wall formation and the orientation of cellulose deposition.
KeywordsGuard Cell Secondary Wall Cellulose Microfibril Tracheary Element Primary Wall
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