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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 104500
Title The influence of external factors on the growth and development of spinach cultivars (Spinacia oleracea L.)
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door J.E. Parlevliet
Author(s) Parlevliet, J.E.
Publisher Wageningen : Veenman
Publication year 1967
Description 75 p ill
Notes Proefschrift Wageningen
Ook verschenen als handelsuitgave
Tutors Wellensiek, Prof. Dr. Ir. S.J.
Graduation date 1967-04-21
Dissertation no. 406
Author abstract show abstract
Influences of genotype (cultivar), temperature, light intensity, gibberellic acid (GA 3 ) and daylength on stem elongation and flowering of spinach were investigated. Most cultivars reacted quantitatively to long days (LD) both for stem and flower formation. Daylength requirements varied from almost dayneutral to LD.

Cold, 2-8°C, decreased daylength requirement; 9-12° only accelerated stem growth. All cvs reacted similarly to temperature. Dimmer light decreased daylength requirement, especially in later cvs. GA 3 accelerated stem growth strongly, flower- formation only slightly.

There was no juvenile stage for temperature or daylength response. Regression of flower formation may occur in a qualitatively LD cv after transfer to SD. Flower formation was most inhibited with photoperiods of 6-10 h; it increased with shorter or longer photoperiods. A qualitative LD cv as 'Nobel' remained vegetative only in SD, if stem growth was inhibited. In SD differentiation in axillary primordia and the consequent formation of flower clusters occurred much slower than in LD and stopped early unless caulescent tissue grew at low temperatures, dim light or GA 3 in accordance with the hypothesis of Chailakhyan that both gibberellins and floral stimulus were needed for stem growth and flower differentiation, respectively, of LD rosette plants. Formation of both hormones would depend on daylength.

Cvs were earlier where they required shorter daylength and where they grew faster. By studying the influences of temperature, vernalisation, light intensity and GA 3 on yields, through their influence on developmental rate and growth rate, several practical conclusions could be drawn about optimum sowing date.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08202,406
FORUM ; STACKS ; NN08200,406
Keyword(s) (cab) spinacia oleracea / spinach
Categories Leafy Vegetables
Publication type PhD thesis
Language English
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