Hemmstoff und Wachstum: Growth Inhibitors, Not Auxin, Regulate Phototropism
Sixty years ago, a famous botanical dissertation appeared in The Netherlands: ‘Wuchsstoff und Wachstum’, by Frits W. Went . One of the classical experiments, described in this publication, was the unilateral illumination of an Avena sativa L. coleoptile tip, collecting the diffusates from the lighted and shaded sides in agar on either side of a flake of mica, and determining the auxin activities using the bioassay described in the paper (Fig. 1). From the auxin activity larger in the diffusate from the shaded side than from the lighted side, it was deduced that phototropic curvature results from differential flank growth caused by a lateral gradient in the cell-elongating substance. This auxin was later recognized as the ubiquitous IAA. The view was extended to gravitropism as the general Cholodny-Went theory of tropic curvature .
KeywordsEthyl Acetone Agar Diethyl Photography
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