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Plant Physiology 46:123-125 (1970) © 1970 American Society of Plant Biologists N-Malonyl-D-tryptophan in Apple Fruits Treated with Succinic Acid 2,2-Dimethylhydrazide1 Crops Research Division, Agricultural Research Service, United States Department of Agriculture, Wenatchee, Washington 98801 Fruit from Red Delicious apple trees treated with the growth retardant succinic acid 2,2-dimethylhydrazide contained more N-malonyl-D-tryptophan than control fruit. When succinic acid 2,2-dimethylhydrazide and tryptophan were injected into immature fruits, more N-methyl-D-tryptophan was produced than when DL-tryptophan was injected alone. Our results suggest that succinic acid 2,2-dimethylhydrazide may control fruit and vegetative growth by interfering with auxin production.
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