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Cytology of Betula alba L. complex

Published online by Cambridge University Press:  05 December 2011

I. R. Brown  and
D. A. Williams
I. R. Brown
Affiliation:
Department of Forestry, University of Aberdeen, Aberdeen AB9 2UU
D. A. Williams
Affiliation:
Department of Forestry, University of Aberdeen, Aberdeen AB9 2UU
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Synopsis

The morphological variation between and within species of Betula has resulted in taxonomic confusion which chromosome studies have been aimed at reducing. The paper briefly reviews the general situation and summarizes recent work at Aberdeen.

Betula forms a polyploid series with chromosome numbers ranging from 2n = 28 to 2n = 84. The native British arborescent birches B. pendula and B. pubescens Ehrh. have respectively 2n = 28 and 2n = 56 chromosomes. Meiosis is essentially regular but many phenomena occur which may account for the production of gametes with non-haploid chromosome numbers. Variation in somatic chromosome number within the leaf tissues of both species is common and trees have been identified whose modal chromosome counts lie between 28 and 56. Some of these trees are of hybrid origin while others may aneuploid B. pubescens. The former types are sterile while the latter cross freely amongst themselves and with 2n = 28 and 2n=56 trees.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 85 , Issue 1-2: Birches , 1984 , pp. 49 - 64
Copyright
Copyright © Royal Society of Edinburgh 1984

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