Inhibition of Auxin Effects by 2,4,6-Trichlorophenoxyacetic acid

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Abstract
The plant growth regulating effects of 2,4-dichlorophenoxyacetic acid, naphthaleneacetic acid, indoleacetic acid, and 2-benzothiazolyloxyacetic acid were inhibited by 2,4,6-trichlorophenoxyacetic acid (2,4,6-T). Auxin-controlled responses of plants inhibited by 2,4,6-T include epinasty, swelling of stems, negative geotropism of stems, orientation of leaves to light and rooting of cuttings. Although 2,4,6-T inhibited other auxin controlled responses, it did not reverse the influence of a terminal bud upon lateral bud growth.