Difference in membrane permeability and composition of basal and apical mung bean hypocotyl segments

Geuns, J. M. C.; Clerk, W. A. E. de

The membrane permeability to water of basal and apical hypocotyl segments was measured. The half-time for the efflux of tritiated water out of basal segments decreased with time, while the half-time of apical segments increased. These results reflect a different membrane permeability. Cortisol enhanced the permeability of basal and apical segments from 3 and 5 d after sowing, respectively. Removal of the roots increased the permeability of the apical segments.