Tissue stresses and resistance to water flow conspire to uncouple the water potential of the epidermis from that of the xylem in elongating plant stems

Functional Plant Biology : FPB
John B Passioura, J S Boyer

Abstract

Considerable evidence exists that, in elongating dicot stems such as soybean hypocotyls: (1) the elongation rate is controlled largely by the mechanical properties of the epidermal cell walls; (2) the inner tissue is under compression in the sense that the turgor pressure of the cells is not fully borne by their cell walls; (3) the surplus turgor pressure in this inner tissue generates a force that is transmitted to the epidermis, where it drives irreversible elongation of the cell walls; and (4) the radial flow of water from the xylem to the rest of the tissue, needed to fill the expanding cells, is driven by gradients in water potential. On the basis of these propositions, this paper develops a mathematical description of the biophysical control of elongation rate and the radial distribution of water potential in the growing plant stem. Additional simplifying assumptions are that the osmotic pressure of the cells and their elastic modulus are constant throughout, and that the proportion of the tensile force that is borne by the walls of the inner cells is also constant. We assume, further, that the epidermal cell walls yield plastically in response to the tensile force they experience, as in the Lockhart model of cell expansi...Continue Reading

Citations

Oct 11, 2005·Annual Review of Cell and Developmental Biology·Tobias I Baskin
Mar 4, 2006·Journal of Experimental Botany·Wieland FrickeVadim Volkov
Mar 7, 2009·Journal of Experimental Botany·Bruno Moulia, Meriem Fournier
Aug 6, 2013·Journal of Experimental Botany·Tobias I Baskin, Oliver E Jensen
Jul 26, 2016·Frontiers in Plant Science·John S Boyer
Oct 1, 2004·Functional Plant Biology : FPB·John S Boyer, Wendy K Silk
May 1, 2005·Functional Plant Biology : FPB·Graham D Farquhar, Lucas A Cernusak
Mar 20, 2008·Journal of Experimental Botany·An-Ching Tang, John S Boyer
Aug 27, 2010·Plant Physiology·Joseph K E Ortega

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