Abscisin II and , some. Hormone-Regulated Plant Responses

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Abstract
The activity of ([plus or minus])-abscisin II [([plus or minus])AbII] and its interaction with a number of plant growth regulators in the control of lettuce germination, lettuce hypocotyl and radicle elongation, cucumber seedling growth, radish leaf senescence, and barley vernalizations were examined. The interactions between ([plus or minus]) AbII and the promoting hormones were of 2 general types. In gibberellic acid (GA3)-promoted lettuce germination and kinetin-controlled leaf senescence, the effects of low concentrations of ([plus or minus])AbII were completely overcome by high concentrations of the other substance. In the 2nd type of interaction, ([plus or minus])AbII was inhibitory only in the presence of high concentrations of the promoter (kinetin in lettuce germination and allogibberic acid in lettuce radicle elongation). Cucumber radicle elongation, on the other hand, was promoted by (+)AbII in the presence of a mixture of GA4 and GA7. These various responses suggest that linking the mechanism of AbII action with that of one growth hormone alone may be too restrictive.