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Growth Regulators Have Rapid Effects on Photosynthate Unloading from Seed Coats of Phaseolus vulgaris L. ¹

Department of Biological Sciences, The University of Newcastle, New South Wales, 2308, Australia

Of nine plant growth regulators (indoleacetic acid, 1-naphthalene acetic acid, gibberellic acid, giberellin 4/7, 6-benzylaminopurine, 6-furfurylaminopurine, abscisic acid, and 1-aminocyclopropane carboxylic acid) tested, only 6-benzylaminopurine and abscisic acid affected ¹⁴C-photosynthate unloading from excised seed coats of Phaseolus vulgaris L. Unloading, in the presence of KCl, was stimulated by 25 to 40%. Stimulation occurred immediately for 6-benzylaminopurine and for abscisic acid within 10 to 12 minutes of application.

¹ Supported by funds to J. W. P. and C. E. O. from the Australian Research Grants Scheme. An academic travel grant from the British Council was awarded to P. E. C. and he was assisted financially by the Senate Research Committee, The University of Newcastle.

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