Abstract
Substances having similar physiological properties to the gibberellins (located by the ‘Meteor’ dwarf pea bio-assay) have been detected in extracts from excised tomato root. The chromatographic behaviour of the most active zone is similar to that of gibberellin A1. Experiments using the d-1 and d-5 mutants of mazie did not indicate the presence of substances with differential effects on these two mutants.

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