Revision of the theory of phototropism in plants: a new interpretation of a classical experiment View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1989-12

AUTHORS

Koji Hasegawa, Masako Sakoda, Johan Bruinsma

ABSTRACT

Went's classical experiment on the diffusion of auxin activity from unilaterally illuminated oat coleoptile tips (Went 1928), was repeated as precisely as possible. In agreement with Went's data with theAvena curvature assay, the agar blocks from the illuminated side of oat (Avena sativa L. cv. Victory) coleoptile tips had, on an average, 38% of the auxin activity of those from the shaded side. However, determination of the absolute amounts of indole-3-acetic acid (IAA) in the agar blocks, using a physicochemical assay following purification, showed that the IAA was evenly distributed in the blocks from the illuminated and shaded sides. In the blocks from the shaded and dark-control halves the amounts of IAA were 2.5 times higher than the auxin activity measured by theAvena curvature test, and in those from the illuminated half even 7 times higher. Chromatography of the diffusates prior to theAvena curvature test demonstrated that the amounts of two growth inhibitors, especially of the more polar one, were significantly higher in the agar blocks from the illuminated side than in those from the shaded side and the dark control. These results show that the basic experiment from which the Cholodny-Went theory was derived, does not justify this theory. The data rather indicate that phototropism is caused by the light-induced, local accumulation of growth inhibitors against a background of even auxin distribution, the diffusion of auxin being unaffected. More... »

PAGES

540-544

Journal

TITLE

Planta

ISSUE

4

VOLUME

178

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00963824

DOI

http://dx.doi.org/10.1007/bf00963824

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1015394422

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24213051


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