A comparative karyotype study was made of chromosomes in root-tip meristematic cells of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco germinants obtained from three Coastal (#1,3,22,) and one Interior (#28) sources distributed through 8°04" latitude. The somatic chromosome number in all provenances was 2n=26 or x=13. The morphological
index was found to be the most useful criterion for separating the five metacentric, six submetacentric and two subtelocentric chromosomes
of the basic set. A clinal increase from south to north in chromosome
width (1.3), and volume (1.6), was noted among the chromosomes of the three Coastal provenances. The haploid chromosome complement of the Coastal provenance (#22) had 1.5 times more volume than the corresponding Interior one (#28), substantiating previous results as far as variation in nuclear volume and DNA contents are concerned. Gasguet (#3) provenance showed more dissimilarities regarding the length of the chromosome arms and secondary constrictions than the chromosomes of the other three provenances
. / Forestry, Faculty of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/18696 |
| Date | January 1974 |
| Creators | De-Vescovi, Maria Adela |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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