| Secondary metabolites of rice sheath blight pathogen Rhizoctonia solani Kühn and their biological activities |
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| 基金项目： | This work was co-financed by the grants from the National Basic Research Program of China (2013GB127800) and the National Natural Science Foundation of China (31271996). |
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| 摘 要： | Eight compounds were isolated from the fermentation cultures of r ice sheath blight pathogen Rhizoctonia solani Kühn. They were identified as er gosterol(1), 6β-hydroxysitostenone(2), sitostenone(3), m-h ydroxyphenylacetic acid(4), methyl m-h ydroxyphenylacetate(5), m-hydroxymethylphenyl pentanoate(6),(Z)-3-methylpent-2-en-1,5-dioic acid(7) and 3-methoxyfuran-2-carboxylic acid(8) by means of physicochemical and spectroscopic analysis. A mong them, 2, 3, 5–8 were isolated from R. solani for the first time. All the compounds were evaluated for their biological activities. 4–6 and 8 showed their inhibitory activities on the radical and germ elongation of rice seeds. 1, 4 and 7 showed moderate antibacterial activity to some bacteria. 4, 7 and 8 exhibited weak inhibitory activities on spore germination of Magnaporthe oryzae. 8 showed moderate antioxidant activity with the 1,1-diphenyl-2-picryhydrazyl(DPPH) and β-carotene-linoleic acid assays. This is the first time to reveal compounds 5, 6 and 8 from rice sheath blight pathogen R. solani to have in vitro phytotoxic activity.
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Secondary metabolites of rice sheath blight pathogen Rhizoctonia solani Kühn and their biological activities |
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| Authors: | XU Liang WANG Xiao-han LUO Rui-ya LU Shi-qiong GUO Ze-jian WANG Ming-an LIU Yang ZHOU Li-gang |
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| Institution: | 1、Key Laboratory of Plant Pathology, Ministry of Agriculture/Department of Plant Pathology, College of Agronomy and
Biotechnology, China Agricultural University, Beijing 100193, P.R.China
2、Institute of Agro-Products Processing and Technology, Chinese Academy of Agricultural Sciences, Beijing 100193, P.R.China |
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| Abstract: | Eight compounds were isolated from the fermentation cultures of rice sheath blight pathogen Rhizoctonia solani Kühn. They were identified as ergosterol (1), 6β-hydroxysitostenone (2), sitostenone (3), m-hydroxyphenylacetic acid (4), methyl m-hydroxyphenylacetate (5), m-hydroxymethylphenyl pentanoate (6), (Z)-3-methylpent-2-en-1,5-dioic acid (7) and 3-methoxyfuran-2-carboxylic acid (8) by means of physicochemical and spectroscopic analysis. Among them, 2, 3, 5–8 were isolated from R. solani for the first time. All the compounds were evaluated for their biological activities. 4–6 and 8 showed their inhibitory activities on the radical and germ elongation of rice seeds. 1, 4 and 7 showed moderate antibacterial activity to some bacteria. 4, 7 and 8 exhibited weak inhibitory activities on spore germination of Magnaporthe oryzae. 8 showed moderate antioxidant activity with the 1,1-diphenyl-2-picryhydrazyl (DPPH) and β-carotene-linoleic acid assays. This is the first time to reveal compounds 5, 6 and 8 from rice sheath blight pathogen R. solani to have in vitro phytotoxic activity. |
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| Keywords: | rice sheath blight Rhizoctonia solani Kühn secondary metabolites bioactivities in vitro phytotoxic activity |
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