Abstract
IN 1939, Thimann1 recorded in a discussion on the growth of roots: “The amount of auxin normally in these roots is not far from the optimum for their growth, so that further addition could be expected to accelerate growth only slightly”. A marked increase in the root growth induced by indole-acetic acid should be obtained only if the supply of the acid in the root is less than the optimum; thus distinct increases have been produced with decapitated roots depleted of their own source of indole-acetic acid2. However, experiments with Lepidium sativum3, Linum usitatissimum4 and Artemisia absinthium5 have shown that it is possible to accelerate the root-growth of germinating seeds.
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References
Thimann, K. V., Biol Rev. Camb. Phil. Soc., 14, 314 (1939).
Geiger-Huber and Burlett, E., Jahrb. wiss. Bot., 84, 233 (1936).
Moewus, F., Naturwiss., 35, 124 (1948); Biol. Zentralbl., 68, 58 a, 118 (1949); Planta, 37, 413 (1949). Pohl, R., Planta, 39, 105 (1951); Biol. Zentralbl., 70, 285 (1951). Ber. dtsch. bot. Ges., 64, 132 (1951). Tegethoff, B., Planta, 38, 648 (1951).
Aberg, B., Physiol. Plant., 3, 447 (1950).
Ashby, W. C., Bot. Gaz., 112, 237 (1951).
Moewus, F., Moewus, L., and Skwarra, H., Planta, 40, 254 (1952).
Moewus, F., and Moewus, L., Z. Naturf. (in the press).
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MOEWUS, F., MOEWUS, L. Sensitivity of Cress Roots to Indole-Acetic Acid. Nature 170, 372 (1952). https://doi.org/10.1038/170372a0
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DOI: https://doi.org/10.1038/170372a0
