PhD theses

All Wageningen University PhD theses

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    Wageningen PhD theses

    This database contains bibliographic descriptions of all Wageningen University PhD theses from 1920 onwards. It is updated on a daily basis by WUR Library.

    Author abstracts and/or summaries are added to all descriptions. A link to the full text dissertation is added to the bibliographic description. In a few cases, no electronic version is available, mostly because of copyright issues.

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Record number 104200
Title De invloed van het blad op de bloei = The influence of the leaf on flowering
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door Dick de Zeeuw
Author(s) Zeeuw, D. de
Publisher Wageningen : Veenman
Publication year 1954
Description 44 p., [4] p. pl
Notes Proefschrift Wageningenshow all notes
Ook verschenen als handelsuitgave
Tutors Wellensiek, Prof. Dr. Ir. S.J.
Graduation date 1954-06-11
Dissertation no. 186
Author abstract show abstract
Flowering of the SD plant Perilla crispa was also possible in LD and in continuous light, if lighting was weak enough. The light range within which flowering is possible, decreased with increasing day length. With an illumination of 300μwatts/cm 2spherical cross-section, seedlings were day-neutral. Older plants proved more predisposed to flower than seedlings. In plants with two equivalent but differently illuminated shoots the brightly lit shoot initiated flowers in long days through influence of the weakly lit shoot; this influence was stronger after defoliation of the brightly lit shoot. Neither in bright nor weak light (with SD or LD) did defoliation qualitatively influence flower initiation. Even 0.5 cm leaf surface was sufficient for flower initiation.

With the day-neutral tomato (Lycopersicum esculentum var. Ailsa Craig) defoliation advanced flower initiation and increased the number of flowers. Brighter light decreased the number of leaves before the initiation of the first flower cluster; in very weak light the plants could be kept vegetative for a year.

With the day-neutral Phaseolus vulgaris var. Vroege Wagenaar defoliation of the main shoot promoted development of axillary shoots, through whose later defoliation the number of flowers could be increased. There was a positive correlation between flower number and light intensity. Flower initiation itself was however independent of intensity, day length, removal of cotyledons or defoliation but the number of flowers decreased through removal of the cotyledons.

In SD plants too much growth regulator probably inhibited flowering; in other plants this was caused by the growing leaf. Flowering probably needed an equilibrium between available assimilates and growth regulators.

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Keyword(s) plant physiology / plant development / flowers / flowering / photosynthesis / leaf fall / light / photoperiod / shade
Categories Photosynthesis
Publication type PhD thesis
Language Dutch; Flemish
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