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Library Catalogue

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    Union Catalogue of Agricultural Libraries in the Netherlands

    The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.

    Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.

    The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.

    As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".

    All titles are entered in their original language. Keywords are added to facilitate subject searching.

    The database is updated every day and now contains over 830.000 records.

Record number 104172
Title Heteroauxin und polaritaet, morphologische und elektrische, bei Coleus-stecklingen
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door G. Hellinga
Author(s) Hellinga, G.
Publisher Wageningen : Veenman
Publication year 1937
Description 69 p ill
Notes Proefschrift Wageningen
Ook verschenen als handelsuitgave
Tutors Reinders, Prof. Dr. E.
Graduation date 1937-07-14
Dissertation no. 103
Author abstract show abstract
Transport of 3-indoleacetic acid (IAA) in Coleus cuttings is only towards the base (indicated by root formation). The physical basis of Went's theory (1932) on IAA anion attraction by a positive pool and repulsion by a negative pool, was shown to be incorrect. Yet potential difference (PD) could be responsible for polar transport. PD-measurements showed that with both normal and inverted cuttings the upper end was always more negative than the lower (held) end. As also no apical transport of basally applied IAA took place in inverted cuttings, PD was not the cause of polar transport. But in inverted cuttings with apically applied IAA upward basal transport took place, against the assumption of electrical transport. Before root formation, the PD was equal in normal and inverted cuttings, independent of IAA application. After root formation, however, the cuttings with and without IAA all showed a marked PD.

An electrical field did not influence IAA transport but weak electric currents induced apical root formation in normal cuttings with apically applied IAA, so that IAA is probably retained. 0,01μg IAA only induced root formation, larger doses also cambial activity, formation of callus, tracheal elements and sclerenchyma bundles (otherwise occurring at older age),

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On paper FORUM ; SPEC.COLL. ; A2096,1937,5
FORUM ; STACKS ; NN08202,103
Keyword(s) (cab) iaa / ocimum / growth / plant development
Categories Lamiales / Plant Growth Regulators
Publication type PhD thesis
Language German
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