Abstract
Terminal bud growth and stem elongation of Xanthi-nc tobacco plants treated with the C3 ester of 2,3-dichlorobenzoic acid (2,3-DCBA) at 2.5 x 10-2M were inhibited. Cells in the shoot apex were normal and inhibition effects were temporary since regrowth occurred. The C3 ester of 2,3,5-triiodobenzoic acid (TIBA) more effectively inhibited terminal growth, and normal tunica layers were absent. Apical cells were irregular in shape and much larger than normal ones. The C8 esters of 2,3-DCBA and TIBA were less active than the C3 esters, but when the activities of the C8 esters were compared, a greater plant response was elicited by the C8 ester of 2,3-DCBA. Plants treated with the C8 ester of 2,3-DCBA developed a recessed apical meristem and leaf primordia which were surrounded by a hollow stemlike structure. Modification of the activities of plant growth-regulating chemicals such as the substituted benzoic acid esters may be due to alterations in their ability to penetrate plant tissue.
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