Abstract
WE cannot subscribe to the assumption of Thimann et al. that when a substance is a true auxin it should always produce inward curvatures in the slit pea stem test, for this test is not a pure elongation growth test1, as it implies much more complicated tissue changes. In a number of experiments on pea epicotyl straight growth we have found significant stimulation by caffeic acid in very dilute solutions.
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References
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VENDRIG, J., BUFFEL, K. Growth-promoting Activity of Caffeic Acid. Nature 193, 1204 (1962). https://doi.org/10.1038/1931204a0
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DOI: https://doi.org/10.1038/1931204a0
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