Abstract

IAA-L-alanine and IAA-DL-aspartate, when applied to internodal explants of Impatiens sultani, mimic the effects of IAA both in inhibiting abscission (when applied at the apical end) and in promoting abscission and rooting, and displacing the site of induced abscission (when applied basally). These IAA conjugates are less active than IAA at similar concentrations, and their promotory effects are slower. Their activity is interpreted in terms of their diffusion into the explants, where they become ‘slow-release’ sources of free IAA through enzyme-catalyzed hydrolysis.

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