Evaluation of crude toxin and metabolite produced by Helminthosporium gramineum Rabenh for the control of rice sheath blight in paddy fields

The metabolites of Helminthosporium gramineum Rabenh were tested for their antagonistic effects towards Rhizoctonia solani (AG-1-IA) , the rice sheath blight fungus. The culture filtrate and EtOAc extract of the culture filtrate and mycelia (termed as crude toxin in this study) of H. gramineum signi...

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Bibliographic Details
Published in:Crop protection 2007-07, Vol.26 (7), p.1036-1041
Main Authors: Duan, Guifang, Zhang, Zhengbo, Zhang, Jianping, Zhou, Yongjun, Yu, Liuqing, Yuan, Qinsheng
Format: Article
Language:English
Subjects:
Biological control
biological control agents
blight
Crude toxin
disease control
fungal antagonists
fungal diseases of plants
Helminthosporium
Helminthosporium gramineum
Helminthosporium gramineum Rabenh
Metabolite
metabolites
Ophiobolin A
Oryza sativa
phytotoxins
plant pathogenic fungi
rice
Rice sheath blight
Thanatephorus cucumeris
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Summary:The metabolites of Helminthosporium gramineum Rabenh were tested for their antagonistic effects towards Rhizoctonia solani (AG-1-IA) , the rice sheath blight fungus. The culture filtrate and EtOAc extract of the culture filtrate and mycelia (termed as crude toxin in this study) of H. gramineum significantly reduced the in vitro growth of R. solani. The biologically active metabolite isolated from crude toxin of H. gramineum was identified as ophiobolin A by spectroscopic analysis. Significant inhibition of mycelial growth of R. solani by ophiobolin A was detected for all concentrations tested. In the field experiments, the treatments of crude toxin effectively reduced the development of rice sheath blight, whereas there were no significant adverse effects on the growth and yield attributes of rice plants. HPLC tests indicated no detectable ophiobolin A remaining in rice grain for all treatments. These results showed that the crude toxin and metabolite produced by H. gramineum may be developed as a biocontrol agent for rice sheath blight control.
ISSN:0261-2194
1873-6904
DOI:10.1016/j.cropro.2006.09.014