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 104453
Title Over de differentiatie van Phytophthora infestans (Mont.) de Bary en de vererving van de resistentie van Solanum demissum Lindl.
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door Cornelis Mastenbroek
Author(s) Mastenbroek, C.
Publisher Amsterdam : Kinsbergen
Publication year 1952
Description 121 p
Notes Proefschrift Wageningen
Tutors Dorst, Prof. Dr. Ir. J.C. ; Oort, Prof. Dr. A.J.P.
Graduation date 1952-03-14
Dissertation no. 170
Author abstract show abstract
In 1943 the breeding work on immunity to blight (Phytophthora infestans) on the Plant Breeding Station of the Central Bureau at Hoofddorp started by using the two races then known in the Netherlands; later 7 new races of Phytophthora were found. The spectra of all known races were investigated and test series composed. The relationships and differences between the races were outlined in schemes.

Segregations in the crosses investigated by repeated inoculations with distinct races could be explained by the hypothesis of three genes for immunity. Segregation ratios indicated that these genes were dominant allelomorphs of three independent genes.

Other authors postulated genetical factors in explaining their observations. To coordinate the hypotheses test series were exchanged.

Although differentiation had been known already for about 25 years the 'new' races were not found on varieties of Solanum tuberosum in practice. This supported the supposition that the 'common' race was superior to the other races on varieties of S. tuberosum.

Some specimens of S.demissum and other Solanum spp. were tested for susceptibility to 8 races. There were great differences between the varieties of S. demissum. Some of the progenies of single plants were homozygous for immunity.

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Keyword(s) plant pathogenic fungi / solanum tuberosum / potatoes / phytophthora
Categories Oomycota / Plant Defence, Plant Resistance
Publication type PhD thesis
Language Dutch; Flemish
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