[Biochemical mechanisms of temperature adaptation in the (+) and (-) strains of Blakeslea trispora].
Mikrobiologiia
; 74(6): 750-5, 2005.
Article
en Ru
| MEDLINE
| ID: mdl-16400984
Evidence obtained with industrial beta-carotene-superproducing (+)T and (-)T strains, which fail to form zygotes, suggests that the lipids in the mycelium of the (-) strain of Blakeslea trispora lack linolenic acid. This circumstance apparently accounts for the fact that the (+) and (-) strains of B. trispora use different adaptive mechanisms to cope with an increase or decrease in cultivation temperature. In the (+) strain, temperature adaptation is based on changes in the ratio between linoleic and linolenic acyls and, also, involves shortening of acyl chains. In addition, the (+) strain contains a larger amount of protective carbohydrates, such as arabitol and trehalose. This strain is characterized by the presence of glycerol, a cryothermoprotector that protects fungal cells at low temperatures. The (-) strain lacks these biochemical mechanisms, but its neutral lipids contain a comparatively high amount of sterols and their esters. These facts enable us to interpret the enhanced thermotolerance of the (-) strain and its capacity to grow at high temperatures in terms of biochemical adaptation. In the light of the data obtained with wild-type and industrial strains, it is suggested that the lack of linolenic acid in the lipids should be considered an essential sex-specific property of the heterothallic strains of Blakeslea trispora.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Adaptación Fisiológica
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Hongos
Idioma:
Ru
Revista:
Mikrobiologiia
Año:
2005
Tipo del documento:
Article
Pais de publicación:
Rusia