ISSN:
1573-6849
Keywords:
B-chromosome
;
DNA sequence composition
;
PREM-1 element
;
random amplification of polymorphic DNA
;
Zea mays
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The overall composition of the maize B is similar to that of the standard chromosome complement (A-chromosomes). This has been demonstrated by the use of several methods including: (a) genomicin situ hybridization (GISH), (b) analysis of highly repetitive sequences by the comparison of restriction digests of 0B and +B DNA and (c) the characterization of middle-repetitive cloned sequences. By the use of the technique of random amplification of polymorphic DNA-polymerase chain reaction, we have identified a B-specific repetitive sequence family. Sequence analysis of the B-specific clone reveals a relationship to the PREM-1 family of maize retroelements, which are preferentially transcribed in pollen. These results suggest an internal origin of the B-chromosome from within the maize genome, but demonstrate also that specific sequences can evolve by rapid processes of genomic turnover. Models for the origin of the maize B are discussed in the context of the present data.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02254939
Permalink
