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Comparative Response to Gibberellic Acid of Dwarf, Semidwarf, and Standard Short and Tall Winter Wheat Varieties¹

Synopsis: Four dwarf and semidwarf wheat varieties were not induced to attain a standard height by treatment with gibberellic acid, and they responded less to treatment than the standard-height varieties. Optimum growth response occurred generally after injections with 100-ppm of gibberellic acid, whereas inhibition was sometimes observed after treatment with 1000-ppm. Spike emergence of 3 of the 6 varieties was hastened. Treatment affected internodes of three varieties differently depending on both variety and concentration of gibberellic acid.

² Agronomists, Crops Research Division, ARS, USDA.

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