期刊
FUNGAL BIOLOGY
卷 114, 期 5-6, 页码 387-395出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.funbio.2010.01.010
关键词
Oxidative stress; Superoxide dismutase; Xanthine oxidase
类别
资金
- European Social Fund (ESF)
- Operational Program for Educational and Vocational Training II (EPEAEK II)
- Program IRAKLEITOS
This study shows that the direct indicator of oxidative stress superoxide radical (O-2(center dot-)) is involved in the sclerotial differentiation of the phytopathogenic filamentous fungi Rhizoctonia solani, Sclerotinia sclerotiorum, Sclerotium rolfsii, and Sclerotinia minor. The production rate of O-2(center dot-) and the antioxidant enzyme superoxide dismutase (SOD) levels in the sclerotiogenic fungi were significantly higher and lower, respectively, than those of their non-differentiating counterpart strains, which strongly suggests that the oxidative stress of the sclerotium differentiating fungi is higher than that of the non-differentiating ones. Xanthine oxidase (XO), which was detected for the first time in fungi in general, was localized in the cytoplasmic membrane. The contribution of XO in the overall O-2(center dot-) production was very significant, reaching 30-70% among the strains, especially in the transition developmental stage between the undifferentiated and the differentiated state, suggesting a sclerotium triggering and a phytopathogenic role of XO during plant infection. The additional finding that these fungi secrete extracellular SOD can be related to their protection from the response of plants to produce O-2(center dot-) at infection sites. (C) 2010 The British Mycological Society. Published by Elsevier Ltd. All rights reserved.
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