Abstract
A method is presented for inducing cell enlargement in intact leaves and leaf strips of Phaseolus vulgaris L. without the complication of cell division. Primary bean leaves complete cell division and stop growing after 10 d in dim red light. Transfer to white light induces expansion (50% in 24 h) which is entirely the consequence of cell enlargement. Leaf strips from red-light-grown seedlings placed in white light and provided external solutes (10 mM KCl+10 mM sucrose) expand at the same rate as intact leaves in the light. This system makes possible future investigation of the mechanism of leaf cell enlargement.
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