We studied the effects of H+-ATPase activator fusicoccin (FC) and its inhibitors, sodium orthovanadate (Na3VO4) and diethylstilbestrol (DES), on the rate of proton secretion by root regions located at various distances from the root tip, the rate of root growth, the length of the fully-elongated root cells, the sizes of growth zones, the relative growth rate of cells along the root length, and the number of fully-elongated cells in the root length increment. FC (10−6 M) stimulated proton secretion by root segments and enhanced root growth due to the greater length of fully-elongated cells. DES (10−4 M) suppressed proton secretion and retarded root growth, decreased the length of fully-elongated cells, inhibited cell division, and slowed down cell transition to elongation by prolonging the life-span of cells in the meristem. Na3VO4 (10−3 and 10−4 M) exerted similar effects. FC, DES, and orthovanadate did not affect the ratio of the relative rate of cell growth in the elongation zone to that in meristem.
Russian Journal of Plant Physiology – Springer Journals
Published: Aug 9, 2005
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