β-carotene production and sclerotial differentiation in Sclerotinia minor

Sclerotinia minor accumulates β-carotene at levels dependent upon oxidative growth conditions and differentiation. β-carotene accumulation is 2.5-fold higher in differentiated mycelia at high than at low oxidative stress, and approx. 3-fold higher in differentiated than in undifferentiated mycelia....

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Bibliographic Details
Published in:Mycological research 2003-05, Vol.107 (5), p.624-631
Main Authors: ZERVOUDAKIS, George, TAIRIS, Nikolaos, SALAHAS, George, GEORGIOU, Christos D.
Format: Article
Language:English
Subjects:
Ascomycota - growth & development
Ascomycota - metabolism
Ascomycota - physiology
beta Carotene - biosynthesis
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Fungal Proteins - metabolism
Fungi
Gene Expression Regulation, Developmental
Lipid Peroxidation
Mycelium - metabolism
Oxidation-Reduction
Oxidative Stress
Plant cytology, morphology, systematics, chorology and evolution
Sclerotinia minor
Thallophyta
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Summary:Sclerotinia minor accumulates β-carotene at levels dependent upon oxidative growth conditions and differentiation. β-carotene accumulation is 2.5-fold higher in differentiated mycelia at high than at low oxidative stress, and approx. 3-fold higher in differentiated than in undifferentiated mycelia. It is proposed that β-carotene may be produced by the fungus to counteract oxidative stress that develops during growth. This is shown by the finding that exogenous β-carotene at growth non-inhibiting concentrations causes a concentration-dependent reduction of oxidative stress (lipid and protein peroxidation) and sclerotial differentiation in this fungus. The data of this study support our hypothesis that sclerotial differentiation in phytopathogenic fungi may be induced by oxidative stress.
ISSN:0953-7562
1469-8102
DOI:10.1017/S0953756203007822