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Effects of rice-water chestnut intercropping on rice sheath blight and rice blast diseases
Institution:1. Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture of the People''s Republic of China, South China Agricultural University, Wushan Road, Guangzhou 510642, China;2. Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Wushan Road, Guangzhou 510642, China;1. Silesian University of Technology, Faculty of Chemistry, Strzody 9, 44-100 Gliwice, Poland;2. Centre of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Sklodowska 34, 41-819 Zabrze, Poland;3. Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland;1. College of Resources and Environment & College of Plant Protection, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming 650201, China;2. College of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201,China;1. College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China;2. State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujain Agriculture and Forestry University, Fuzhou 350002, China;3. Crop College of Fujian Agriculture and Forestry University, Fuzhou 350002, China;4. Fujian Science and Research Institute of Tobacco Farming, Fuzhou 350002, China;5. Wuping Corporation of Longyan City Corporation of Fujian Province Tobacco Corporation, Wuping, Fujian 364300, China;6. Longyan Substation of Fujian Science and Research Institute of Tobacco Farming, Longyan, Fujian 364000, China;1. Institute of Plant Protection, Gansu Academy of Agricultural Sciences, Lanzhou, 730070, China;2. College of Agronomy, Gansu Agricultural University, Lanzhou, 730070, China;3. Institute of Plant Protection, Chinese Academy of Agricultural Sciences, 2 Yuanmingyuan Xilu, Beijing, 100193, China
Abstract:Both sheath blight and blast are important rice diseases worldwide. The exploration of environmentally sound practices to control these diseases will help to reduce fungicide application. Effects of rice (Oryza sativa) intercropping with water chestnut (Eleocharis dulcis) on rice sheath blight and rice blast disease as well as the extracts of different plant parts and root exudates from water chestnut on pathogens of rice sheath blight (Rhizoctonia solani) and rice blast disease (Magnaporthe oryzae) were investigated using pot experiments and bioassay tests. The results from pot tests showed that rice-water chestnut intercropping system suppressed sheath blight and blast and improved land equivalent ratio (LER). The results from bioassay tests indicated that extracts and root exudates from water chestnut had significant effects to inhibit the expansion of these pathogens. The scales of these inhibitions were time and concentration dependent. The antifungal activities of the extracts from aboveground parts and pulp of water chestnut were significantly higher than the extracts from other parts and root exudates. The water extracts of aboveground parts showed the highest antifungal activity on both pathogens according to EC50 values. The antifungal activities of the same extracts from water chestnut on R. solani were significantly higher than on M. oryzae. The result suggests that water chestnut possesses bioactive substances to suppress rice sheath blight disease and rice blast disease. The rice-water chestnut intercropping system can be used as an environment-friendly method for diseases control in rice field.
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