. Auxins and plant growth. Auxin; Plant growth promoting substances. Developmental Effects of Auxins 95 The promotion and inhibition of flowering by auxins have been plotted in this way (Leopold and Thiniann, 1949), and similar curves (<nild be drawn lor fruit growth and leaf growth. A leinarkable tlualisin exists in the actions of auxin. Auxin tan either stimulate or inhibit the various growth functions. .Auxins can promote or inhibit the differentiation of buds, promote or inhibit the production of flowers, promote or inhibit abscission, promote or O h- o o a: a. m X. 10 M AUXIN CONCENTRA
. Auxins and plant growth. Auxin; Plant growth promoting substances. Developmental Effects of Auxins 95 The promotion and inhibition of flowering by auxins have been plotted in this way (Leopold and Thiniann, 1949), and similar curves (<nild be drawn lor fruit growth and leaf growth. A leinarkable tlualisin exists in the actions of auxin. Auxin tan either stimulate or inhibit the various growth functions. .Auxins can promote or inhibit the differentiation of buds, promote or inhibit the production of flowers, promote or inhibit abscission, promote or O h- o o a: a. m X. 10 M AUXIN CONCENTRATION Fig. 46. Ranges of growth responses to auxin (indoleacetic acid) for various plant organs (modified from Thimann, 1937). inhibit respiration or activity of some enzymes, promote or inhibit protoplasmic streaming, promote or inhibit the accumulation of cer- tain biochemical plant constituents, and promote either differentiation or dedifferentiation of living cells. In each case, the effect obtained is primarily a function of the effective auxin concentration in the tis- sue. A logical explanation on a biochemical basis of the dualism of auxin effects upon growth is discussed in chapter 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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