ISSN:
1617-4623
Keywords:
Meloidogyne rDNA
;
Intergenic spacer
;
Repeated DNA sequences
;
Plasmid deletion/recombination
;
Plant rDNA
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary Ribosomal DNA (rDNA) repeats of the plant-parasitic nematode Meloidogyne arenaria are heterogeneous in size and appear to contain 5S rRNA gene sequences. Moreover, in a recA + bacterial host, plasmid clones of a 9 kb rDNA repeat show deletion events within a 2 kb intergenic spacer (IGS), between 28S and 5S DNA sequences. These deletions appear to result from a reduction in the number of tandem 129 by repeats in the IGS. The loss of such repeats might explain how rDNA length heterogeneity, observed in the Meloidogyne genome, could have arisen. Each 129 by repeat also contains three copies of an 8 by subrepeat, which has sequence similarity to an element found in the IGS repeats of some plant rDNAs.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00259687
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