Abstract:
:After selective enrichment and differential hybridisation of Cot-1 DNA fractions of plants with and without polymorphic heterochromatic segments, a repetitive sequence (called Bds1) specific to the polymorphic chromosome segments of Brachycome dichromosomatica (Brachyscome dichromosomatica) was isolated. A single repeat unit of Bds1 is 92 bp long and is organised in tandem arrays at three different polymorphic segment sites on the chromosomes of cytodeme A2. Although all three sites showed extensive polymorphism between plants, the karyotypes of all analysed mitotic root cells were stable within a single plant. Electron microscopy revealed heavily condensed chromatin structures at the most obvious polymorphic site. The mechanisms that generate and maintain the observed chromosome structure polymorphisms are discussed.
journal_name
Chromosomajournal_title
Chromosomaauthors
Houben A,Wanner G,Hanson L,Verlin D,Leach CR,Timmis JNdoi
10.1007/s004120050430subject
Has Abstractpub_date
2000-06-01 00:00:00pages
206-13issue
3eissn
0009-5915issn
1432-0886journal_volume
109pub_type
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