ISSN:
1432-0983
Keywords:
Key words Pulsed-field gel electrophoresis
;
Electrophoretic karyotype
;
Chromosome-length polymorphism
;
Genomic fingerprinting
;
RAPD
;
Sclerotinia sclerotiorum
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Molecular techniques have been used to characterize different field isolates of Sclerotinia sclerotiorum, an ubiquitous phytopathogen. Chromosomal DNA resolved by pulsed-field gel electrophoresis (PFGE) revealed that S. sclerotiorum contains at least 16 chromosomes ranging from 1.5 Mb to 4.0 Mb. The size of the haploid genome was estimated to be 43.5 Mb. Six field isolates with different levels of virulence on sunflower germlings or green beans were differentiated by random amplification of polymorphic DNA (RAPD), and analysed by clamped homogeneous electric field electrophoresis. This analysis revealed few chromosome-length polymorphisms among these strains. Chromosomal DNA hybridization indicated that the endopolygalacturonase-encoding pg1 gene is localized on the smallest chromosome of all the strains, whereas the ribosomal DNA mapped to different-sized chromosomes. The less-aggressive strain was characterized by the presence of a supernumary small band, presumably consisting of dsRNA. In contrast to numerous other phytopathogenic fungi, this study reveals a strong karyotypic stability among the strains of S. sclerotiorum which may be preserved by the sexual mode of reproduction of this species
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s002940050077
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