ISSN:
1573-6857
Keywords:
Allium
;
mutations
;
heterochromatin
;
telomeres
;
callus
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Heterochromatin behaviour and structural alterations in chromosomes of cells derived from callus culture ofAllium fistulosum have been studied. The diploid chromosome complement ofAllium fistulosum consists of 16 chromosomes with significant amount of heterochromatin mainly of telomeric nature. In eight collections of callus cells analysed, a high rate of numerical and structural chromosome abnormalities was observed. After 12 months in culture about 20% of metaphase chromosomes possessed distinct signs of mutational events. C-banded preparations revealed that many structural alterations involved regions of heterochromatin. Interchromosomal connections and chromatid fusions occurred at telomeric heterochromatin segments. Also formation of the end-to-end associations and polycentric chromosomes often took place without visible loss of telomeric heterochromatin.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01439572
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