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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    mail icon WUR Library, 9 july 2012

     

Record number 104457
Title Over den bouw en de periodieke ontwikkeling der bloemknoppen bij Coffea-soorten
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door A. van der Meulen
Author(s) Meulen, A. van der
Publisher Amsterdam : Noord-Hollandsche
Publication year 1939
Description 127 p + 4 losse bijl
Series title Mededeeling / Laboratorium voor Plantenphysiologisch Onderzoek (60)
Series title Verhandelingen der Koninklijke Nederlandsche Akademie van Wetenschappen. Afdeeling Natuurkunde. Sectie 2 (2, dl. 38)
Notes Proefschrift Wageningen
Tutors Blaauw, Prof. Dr. A.H.
Graduation date 1939-06-16
Dissertation no. 114
Author abstract show abstract
In regions with abundant rainfall coffee shows a flowering rhythm quite different from that in regions with distinct dry and wet periods. Some species and varieties flower only on the first-year wood, other ones also on the older wood. In some flowering lasts much of the year, other bloom heavily for only a short time. To find whether these differences already appear in the origin of the flowers, descriptions were made of the morphology and development of the branch system, the inflorescence and the flower with Coffea canephora P. var. robusta Linden and C. macrochlamys K. Sch. var. excelsa A. Chev., and besides of the structure of the inflorescence of C. arabica L. The structure of the inflorescence of Coffea L. was shown to derive from the structure of the vegetative parts of the plant. Eight stages could be distinguished in the development of the vegetative points of third degree into flowers.

Between the periodicity of floral initiation on primary side-branches of some Coffea L. spp. and the periodicity of wet and dry periods, different relations were found for different species and varieties, but in the second half of a dry period flowers never arose. Constantly wet regions gave robust plants with few flowers and so smaller yields than regions with periodic drought giving thinner plants with many flowers. Much useful literature on flowering was reviewed.

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Keyword(s) coffea / coffee / botany
Categories Stimulant Crops
Publication type PhD thesis
Language Dutch; Flemish
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