The Effects of 2:4-Dichlorophenoxyacetic Acid, 2:3:5-Tri-Iodobenzoic Acid, and Thiourea on the Vegetative and Reproductive Growth ofAvena sativa

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Abstract
The effects of 2:4-dichlorophenoxyacetic acid (2:4-D), 2:3:s-tri-iodobenzoic acid (TIBA), and thiourea on the growth of Avena sativa have been studied in relation to subsequent leaf development, tiller production, and apical growth of the seedlings. Treatments with 2:4-D and TIBA depressed the emergence of each successive shooting leaf, but thiourea, at the concentration used, proved to be lethal. Subsequent observations on the tillering capacity of the seedlings show that treatment with 2I4-D significantly increases the rate of tiller production, but that TIBA fails to do so. Longitudinal sections through the apices of the treated seedlings show that both treatments have inhibited the development of the apex. 2I4-D inhibition is the greater. In the concentrations applied, neither treatment caused any obvious abnormalities in respect of mature leaves.