Abstract

1. Foliar sprays of 2,4-dichlorophenoxyacetic acid (2,4-D) and maleic hydrazide, used alone and in combination, caused significant changes in the relative total amounts of free amino acids in young pintobean, sugar-beet, and potato tops. 2. The described treatments caused decided changes in the relative amounts and character of the proteins in the same plants. 3. The qualitative changes in the protein fractions of potato, sugar-beet, and pinto-bean tops were different from one another. This may be the fundamental basis for the selective action of 2,4-D and maleic hydrazide.

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