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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 104006
Title Een cytologisch onderzoek aan eenige soorten en soortsbastaarden van het geslacht Saccharum
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door Gustav Bremer
Author(s) Bremer, G.
Publisher Den Haag : Mouton
Publication year 1921
Description 126 p.
Notes Proefschrift Wageningen
Tutors Honing, Prof. Dr. J.A.
Graduation date 1921-11-28
Dissertation no. 4
Author abstract show abstract
Within the wild cane, Saccharum spontaneum, 56 bivalent chromosomes are found in a regular division of pollen mother cells, indicating a somatic chromosome number 112.

Several well known varieties of sugar-cane, S. officinarum, appeared to have 40 chromosomes in the haploid phase and 80 in the somatic phase. But in these canes, meiosis was often seriously disturbed, reducing the fertility. This was also so with the very thin Indian canes Chunnee and Ruckree 11, having 90-91 chromosomes somatically.

In relation to the reduced fertility of S. officinarum, it was remarkable that hybrids between S. officinarum (n = 40) and S. spontaneum (n ~ 56) were very fertile, since usually hybrids between species with different chromosome numbers are partly fertile or totally sterile. However the hybrids between the above species did not have 40 + 56 = 96 chromosomes, but 40 + 40 + 56 = 136 chromosomes. This was also so for Kassoer, a similar interspecific hybrid found wild, that was especially used for hybridization with S. officinarum.

Cytological research of Kassoer and the hybrids from crosses of S. officinarum with S. spontaneum demonstrated that 68 bivalents could be counted in the metaphase of reduction division.

The doubling of the S. officinarum chromosomes from 40 to 80 is probably due to longitudinal splitting of the S. officinarum chromosomes during fertilization in the zygote, thus providing (2 x 40) + 56 = 136 chromosomes.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08202,04
Keyword(s) (cab) saccharum officinarum / sugarcane / botany
Categories Cyperales (Cyperaceae, Poaceae) / Sugarcane
Publication type PhD thesis
Language Dutch; Flemish
About cum laude graduation (with distinction)
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