Abstract
A study has been made of a range of maleic hydrazide (MH) derivatives to compare their molecular structures with what has already been found concerning MH behaviour in willow (Salix viminalis L.). Use was made of two properties of MH, one of which was the ability to become concentrated into root apices of young willow roots (Coupland and Peel, 1971); the other was the ability of MH to inhibit the uptake of uracil into the sieve elements in bark strip material (Coupland and Peel, 1972). As a result of the present investigations it appears that an unsaturated heterocyclic ring system, including the grouping-CH=CH-CO-NH- is essential to retain the characteristics of the MH molecule.
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