Library Catalogue

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 104465
Title An attempt to analysis of the effect of light on stem elongation and flowering in Hyoscyamus niger L.
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door P.J.A.L. de Lint
Author(s) Lint, P.J.A.L. de
Publisher Wageningen : Veenman
Publication year 1960
Description 59 p
Notes Proefschrift Wageningen
Ook verschenen als handelsuitgave
Tutors Wassink, Prof. Dr. E.C.
Graduation date 1960-12-07
Dissertation no. 291
Author abstract show abstract
The shooting of Hyoscyamus niger was studied as a reaction to radiation with coloured or white light in various combinations of intensity and duration. Research into the reaction to very short photoperiods became possible by continuing treatments with weak light not longer than 6 or 10 days, and then to keep the plants in LD of white light until shooting.

The data presented were interpreted as follows. Hyoscyamus would grow vegetatively if floral induction (an accumulative and autonomous process comprising flower bud initiation and a shooting impulse) were inhibited, also if stem elongation underlay formative inhibition (suppression of etiolation). Thus, vegetative growth may be due either to unsuitable photoperiod, primarily inhibiting floral induction, or to unsuitable light quality, primarily causing formative inhibition of stem elongation.

The formative inhibition was due to the production of an inhibitor precursor, which became active principally in darkness, after a light period. In the dark, the precursor would be gradually converted into an inhibitor which itself had no measurable persistence but took immediate effect as an inhibition. In longer maintained darkness the plant was no longer inhibited, no more than during light. The inhibition by short photoperiods increased with time of radiation as in a formative light action. Near-infrared may be assumed to antagonize inhibition by inactivating the precursor.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08202,291
Keyword(s) (cab) growth / plant development / stimulants / stimulant plants
Categories Plant Development
Publication type PhD thesis
Language English
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