. Auxins and plant growth. Auxin; Plant growth promoting substances. 162 Fundamentals of Auxin Action SUBSTANCES WHICH MODIFY AUXIN EFFECTS Auxin Synergists Many substances which are not auxins, since they cannot stimu- late growth in auxin-free tissues, can promote growth through a syner- gistic action with auxin. Conversely they can inhibit growth when present in relatively high concentrations. 10 or I- O LlI > < /Jux/n Alone /°v A. -^ A \ ' - \ o \ ⢠- .. 1 1 \ \ â o \ ⢠0. 100 MG/L 100 MG/L CONG. OF TIBA Fig. 72. Elfects of TIBA (2,3,5-tiiiodobenzoic acid) upon auxin-induced curva
. Auxins and plant growth. Auxin; Plant growth promoting substances. 162 Fundamentals of Auxin Action SUBSTANCES WHICH MODIFY AUXIN EFFECTS Auxin Synergists Many substances which are not auxins, since they cannot stimu- late growth in auxin-free tissues, can promote growth through a syner- gistic action with auxin. Conversely they can inhibit growth when present in relatively high concentrations. 10 or I- O LlI > < /Jux/n Alone /°v A. -^ A \ ' - \ o \ ⢠- .. 1 1 \ \ â o \ ⢠0. 100 MG/L 100 MG/L CONG. OF TIBA Fig. 72. Elfects of TIBA (2,3,5-tiiiodobenzoic acid) upon auxin-induced curvature in the Avena test. A: the inhibition of Avena curvature by high concentrations of TIBA. The indoleacetic acid concentration was held constant at (from Galston, 1947); B: increases in auxin-induced curvature by applying low concentra- tions of TIBA. The indoleacetic acid concentration was held constant at (from Thimann and Bonner, 1948).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Leopold, A. Carl (Aldo Carl), 1919-. Berkeley, University of California Press
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