Shoots grown out from aspen root sections in light or in darkness were extracted and the content of growth‐regulating substances in various fractions was determined with the Avena coleoptile straight‐growth assay. The most obvious difference was obtained for the inhibitor β fraction. This was about ten times more active in the light‐grown than in the dark‐grown shoots. Some indications of more growth inhibitory material in ether‐insoluble fractions of light‐grown plants were also obtained. The stimulation obtained at the Rf of indol‐3‐yl‐acetic acid was somewhat lower in the etiolated shoots than in the light‐grown ones.
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Lennart Eliasson (1971) studied this question.
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