Abstract
1. Young barley plants sprayed with maleic hydrazide (MH) showed a smaller fresh weight but greater dry weight than untreated plants after 12 days. 2. The increase in dry weight was due predominantly to accumulation of fructosan polysaccharides; sugars remained the same. 3. Drops of exudate on treated leaves contained mostly sucrose, no fructosan, and showed total nitrogen equal to that of the plant material. 4. 2,4-D (2,4-dichlorophenoxyacetic acid) partially antagonized the effect of maleic hydrazide on barley plants. 5. Maleic hydrazide interferes with translocation and the curvature effect of 2,4-D in the epicotyl of young bean plants. Either MH itself is translocated, or some secondary effect is transmitted from the leaf to the epicotyl. 6. No evidence was obtained of abnormal callus formation on sieve plates as an effect of maleic hydrazide. 7. In bean plants, starch accumulation is a visible response to MH treatment. 8. Possible mechanisms of action of MH are discussed.
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