Mitotic mapping in linkage group V of Aspergillus niger based on selection of auxotrophic recombinants by Novozym enrichment.
Can J Microbiol
; 35(11): 982-8, 1989 Nov.
Article
in En
| MEDLINE
| ID: mdl-2611733
ABSTRACT
This paper describes a procedure which allows the quantitative selection of auxotrophs of the fungus Aspergillus niger by enzymatic killing of immobilized germinating prototrophic conidiospores. We have applied this procedure to linkage analysis on the basis of mitotic cross-over in this fungus. Starting with a heterozygous diploid strain, we could select auxotrophic homozygous diploid recombinants quantitatively. We estimated the frequency of crossing-over after correction for clonal distribution of recombinants, and localized four auxotrophic markers as well as the centromere on chromosome V of this fungus. The Novozym enrichment procedure proved to be useful in genetic analysis and for the construction of recombinant genotypes in the case of closely linked auxotrophic markers. The determination of gene order and the estimation of distances on the basis of benomyl-induced recombinant haploid segregants may lead to incorrect conclusions. Genetic analysis on the basis of homozygous recombinants, however, can provide reliable estimates of map distances.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Aspergillus niger
/
Chromosomes, Fungal
/
Crossing Over, Genetic
/
Genetic Linkage
/
Mitosis
Language:
En
Journal:
Can J Microbiol
Year:
1989
Document type:
Article
Affiliation country:
Netherlands