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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 104391
Title The cytological background of Cyclamen breeding = De cytologische achtergrond van de cyclamen-veredeling
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by R.A.H. Legro
Author(s) Legro, R.A.H.
Publisher Wageningen : Veenman
Publication year 1959
Description 51 p ill
Notes Proefschrift Wageningen
Ook verschenen als handelsuitgave
Tutors Wellensiek, Prof. Dr. Ir. S.J.
Graduation date 1959-06-04
Dissertation no. 255
Author abstract show abstract
Cytological studies and crossing experiments were carried out in both cultivars and species of Cyclamen in connection with breeding. Within 278 groups of Cyclamen cvs. grown at different nurseries in Western Europe, there were 48 diploids with 2n = 48, 168 tetraploids with 2n = 96, 58 and 4 aneuploids with 2n = 92 and 94, 95, respectively. It was known that the first tetraploid and aneuploid originated in 1863 and 1898, respectively.

The results of reciprocal crosses between diploids and tetraploids were studied. On genetic evidence the origin of the unexpectedly high number of tetraploid descendants was explained by dispermy (fertilization of the female gamete by two male gametes) in the cross 4n x 2n and analogously by endogamy (fusion of 2 haploid embryo sac nuclei) in the 2n x 4n cross.

The chromosome range of 14 Cyclamen spp. was determined as 20, 22, 30, 34, 48, 84-86, 96 and 136, to be grouped into 3 polyploid series with the basic numbers n = 10, 17 and 24. Attempts to produce interspecific hybrids failed, except once. Reconstruction of some numbers and creation of missing links by crossing the present-day species was therefore impossible.

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On paper FORUM ; STACKS ; NN08202,255
Keyword(s) (cab) ornamental plants / primulaceae
Categories Ornamental Plants
Publication type PhD thesis
Language English
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