Abstract
Auxin has been studied for fifty years as a regulating hormone in many developmental phenomena (1). Much of this work has been devoted to its effect on cell enlargement (2–6); however, our accumulated knowledge of auxin-regulated cell enlargement does not include an understanding of its primary mode of action. In the 1960’s the “gene expression” hypothesis of Key, and others (4) was popularly accepted. In the early 1970’s, however, the “wall acidification” (7) hypothesis of Rayle and Cleland (5) and Hager et al. (8) was proposed. It has been supported in numerous reports (5).
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References
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The hypothesis has various names, e.g., the “acid growth” hypothesis, the “proton extrusion” hypothesis. I propose “wall acidification” hypothesis because it is more accurately descriptive of the hypothesis, and it reflects the supporting data
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Vanderhoef, L.N. (1980). Auxin-Regulated Elongation: A Summary Hypothesis. In: Skoog, F. (eds) Plant Growth Substances 1979. Proceedings in Life Sciences. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-67720-5_8
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DOI: https://doi.org/10.1007/978-3-642-67720-5_8
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