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Cortisol and membrane permeability for tritiated water of mung bean hypocotyl sections



Cortisol and membrane permeability for tritiated water of mung bean hypocotyl sections



Phytochemistry 28(2): 319-322



The membrane permeability of basal and apical hypocotyl segments from mung bean seedlings was studied as a function of time after sowing. Cortisol enhances membrane permeability of the basal hypocotyl segments from the third day and the membrane permeability of the apical hypocotyl segments from the fifth day. When the cotyledons are removed three days after sowing, the permeability of basal hypocotyl segments from seedlings grown in water increases two days, after removal, while the permeability of the apical segments increases one day after removal. Removal of the cotyledons also increases the permeability of apical hypocotyl segments from seedlins grown in cortisol, but has no significant influence on the permeability of the basal hypocotyl segments. Incubation experiments with hypocotyl segments revealed that a three hr incubation in cortisol was sufficient to increase membrane permeability by .+-.20%.

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