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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 104194
Title Nutmeg cultivation and its sex-problem : an agronomical and cytogenetical study of the dioecy in Myristica fragrans Houtt. and Myristica argentea Warb.
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door M. Flach
Author(s) Flach, M.
Publisher Wageningen : Veenman
Publication year 1966
Description 86 p ill
Notes Proefschrift Wageningen
Ook verschenen als handelsuitgave
Tutors Prakken, Prof. Dr. R. ; Ferwerda, Prof. Dr. Ir. J.D.
Graduation date 1966-03-30
Dissertation no. 397
Author abstract show abstract
Indonesia produced 60 %, Grenada 40 % of the 5600 tons of nutmeg (the dry shelled seeds) and 1400 tons of mace (the dry arillus) of the tropical rain forest tree Myristica fragrans. Restriction of male flowering trees to 10 % and spacing at 9 metres would rise yields per ha sharply above the usual 800 kg nutmeg and 160 kg mace, at 2000 fruits per female tree.

In Grenada air-layering and approach-grafting, although expensive, were developed for practical use. In New Guinea the tree showed a 1:1 segregation into a female-only flowering sex, with strong correlation between production and stem girth, and a male-flowering sex, mostly bearing also female flowers and fruits.

Investigations for a visible chromosomal sex mechanism showed 44 (2n) nearly isodiametric chromosomes (0.4-1.0μ) and 'non-localized' centromeres. Breakage of chromosomes by X-rays produced persisten fragments, proving nutmeg to be the first dicotyledon with diffuse centromeres.

The hypothesis was developed that nutmeg had four pairs of sex chromosomes. The heterogametic female had four facultative nucleolar sex chromosomes, in meiosis orientated by the nucleolus. The variation in female flowering was explained by partial failure of orientation. If proved, the hypothesis offered opssibilities for sexing young seedlings and improvement by breeding.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08200,397
FORUM ; STACKS ; NN08202,397
Keyword(s) (cab) myristica fragrans / nutmegs
Categories Spices
Publication type PhD thesis
Language English
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