Genetic determination of ploidy level in Xanthophyllomyces dendrorhous

Hermosilla, G; Martínez C; Retamales, P; Leon, R; Cifuentes, V

Abstract

Xanthophyllomyces dendrorhous (formely Phaffia rhodozyma) is a basidiomycetous yeast-like fungus that produces carotenoids useful for the food industry. Recently, its sexual cycle was reported but little is known about its genetic constitution. To inquire into the ploidy state of X. dendrorhous, biased mutant spectrum, genetic complementation and mitotic recombination analysis were used. A wild-type strain was subjected to N-methyl-N?-nitro-N-nitrosoguanidine mutagenic treatment. Auxotrophic and carotene mutants were forced to revert to the wild-type phenotype. Pigment producing and prototroph revertants behaved as diploid except for adenine less mutants. These results are in agreement with the limited spectrum of auxotrophs obtained in this strain for the ADE1 locus. To analyze the genetic characteristic of the adenine genetic marker of X. dendrorhous, protoplast fusion experiments with several adenine less mutants were performed. The experiments presented in this work suggest that the ATCC 2430 (UDC 67-385) strain of X. dendrorhous is diploid and a heterozygous constitution is proposed for the ADE1 locus.

Más información

Título según WOS: Genetic determination of ploidy level in Xanthophyllomyces dendrorhous
Título según SCOPUS: Genetic determination of ploidy level in Xanthophyllomyces dendrorhous
Título de la Revista: ANTONIE VAN LEEUWENHOEK INTERNATIONAL JOURNAL OF GENERAL AND MOLECULAR MICROBIOLOGY
Volumen: 84
Número: 4
Editorial: Springer
Fecha de publicación: 2003
Página de inicio: 279
Página final: 287
Idioma: English
URL: http://link.springer.com/10.1023/A:1026090008405
DOI:

10.1023/A:1026090008405

Notas: ISI, SCOPUS