The Inactivity of 1-Docosanol in Some Plant Growth Tests in Relation to the Auxin of Maryland Mammoth tobacco

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Abstract
In extracts of shoots of Nicotiana tabacum cv. Maryland Mammoth, an auxin was detected with the same chromato-graphic properties as 3-indoleacetic acid (IAA). This auxin promoted cell extension in Avena coleoptile and 1st internode sections and was active in the Avena curvature test. The long-chain fatty alcohols 1-docosanol and 1-octadecanol were found to be inactive in Avena coleoptile extension and Avena coleoptile curvature tests. 1-Docosanol was inconsistently active in promoting the extension of Avena 1st internode sections and the increase in wet weight of isolated tobacco stem pith. It is argued that an auxin can be extracted from Maryland Mammoth plants, which is probably IAA and not a long-chain fatty compound. The claim in the literature that IAA is absent from this tobacco and that the auxin activity detected in extracts is due to substances similar to 1-docosanol must be reconsidered.

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