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Differential effect of calcium and magnesium on mechanical properties of pea pisum sativum cultivar alaska stem cell walls



Differential effect of calcium and magnesium on mechanical properties of pea pisum sativum cultivar alaska stem cell walls



Plant & Cell Physiology 22(7): 1305-1316



Replacement of Ca2+ with Mg2- in the cell wall of the pea [P. sativum] epicotyl makes the wall more extensible. A possible role of this differential effect of Ca2+ and Mg2+ in regulating cell elongation in the pea epicotyl is discussed. The ratio of Ca2+Mg2+ in the walls decreased markedly in the order of the 1st > the 2nd > the 3rd internodes of the pea epicotyl. The capacity of the walls for cation excange increased in the same order, whereas the Ca2+-Mg2+ ion exchange selectivity of the walls was virtually constant. Apparently, the changes in the Ca2+/Mg2+ ratio among the internodes is not attributable to the ion exchange properties of the walls per se, but is due to other physiological conditions which regulate the activities of free Ca2+ and Mg2+ ions in the environment with which the walls are in equilibrium.

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Accession: 005154380

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