Chromosome evolution in the Brachytheciaceae
作者:
McAdamS. Vilma,
期刊:
Journal of Bryology
(Taylor Available online 1982)
卷期:
Volume 12,
issue 2
页码: 233-258
ISSN:0373-6687
年代: 1982
DOI:10.1179/jbr.1982.12.2.233
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractTwenty-eight moss species have been investigated cytologically. Mitotic karyograms have been presented for most of these species and these show a remarkable similarity in then= 11 karyotype. Nine of the eleven chromosomes have terminal or sub-terminal centromeres. Lightly staining heterochromatic bands frequently occur along the axis of the chromosomes and very often these are the sites of chromosome bending; it has been suggested that these may be areas of neocentric activity. The karyotypes investigated show a reduction series of chromosome number which is paralleled by an increase in the number of long metacentrics; since the number of major chromosome arms is maintained in most of the species it has been suggested that Robertsonian fusion has been an important mechanism in the evolution of the Bracytheciaceae, and probably in all Diplolepidous mosses. Polyploidy has also played an important role in speciation. Finally it has been proposed thatn= 11 is the primary basic number in the Diplolepideae.
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