Distribution of growth and proton efflux in gravireactive roots of maize (Zea mays L.).
Roots of Zea mays were maintained in a vertical orhorizontal position and the local elongation rate and H(+) fluxes were measured using Sephadex beads containing a pH indicator. When the roots were kept horizontally, the growth of the lower side was strongly inhibited and that of the upper side slightly stimulated as compared with vertical roots. The H(+) extrusion, which was greatest in the elongation zone, was strongly inhibited on the lower side and slightly stimulated on the upper side as compared with vertical roots.
Institute of Plant Biology and Physiology of the University, Biology Building, CH-1015, Lausanne, Switzerland.
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