Plant activator and a method of manufacturing the same

Abstract

The objective of the invention is to provide a plant activator with superior resistance-inducing activity and growth promoting activity and low toxicity and soil contamination. A plant activator comprising a fatty acid metabolite obtainable by a metabolism of a fatty acid with 4 to 30 carbon atoms by a proteobacteria under a dissolved oxygen concentration of 0.1-8 mg/L, and a method for manufacturing a plant activator comprising a fatty acid metabolite, comprising a step for fatty acid metabolism wherein a fatty acid with 4 to 30 carbon atoms is subjected to a proteobacterial metabolization under a dissolved oxygen concentration of 0.1-8 mg/L. A method for manufacturing a plant activator comprising a fatty acid metabolite, comprising a step for fatty acid metabolism wherein a fatty acid with 4 to 30 carbon atoms is subjected to a proteobacterial metabolization under a dissolved oxygen concentration of 0.1-8 mg/L.

What is claimed: 
     
         1 . A plant activator comprising a fatty acid metabolite obtainable by a metabolism of a fatty acid with 4 to 30 carbon atoms by a proteobacteria under a dissolved oxygen concentration of 0.1 to 8 mg/L. 
     
     
         2 . The plant activator of  claim 1 , wherein the fatty acid is a liquid fatty acid at a temperature of 20° C. 
     
     
         3 . The plant activator of  claim 1 , wherein the proteobacteria is a proteobacteria pre-cultured to 1×10 8  to 9×10 10  cells/mL. 
     
     
         4 . The plant activator of  claim 1 , wherein the metabolism is a metabolism in the presence of at least one type of mineral selected from Mg, P, Na and K. 
     
     
         5 . The plant activator of  claim 1 , wherein the plant activator comprises a biosurfactant. 
     
     
         6 . The plant activator of  claim 1 , wherein the metabolism is a metabolism under a condition of temperature from 10 to 40° C. 
     
     
         7 . The plant activator of  claim 1 , wherein the plant activator serves as a resistance-inducing agent. 
     
     
         8 . The plant activator of  claim 1 , wherein the plant activator serves as a prophylactic agent for a wilt disease in solanaceous plants. 
     
     
         9 . A method for manufacturing a plant activator comprising a fatty acid metabolite, comprising a step for fatty acid metabolism wherein a fatty acid with 4 to 30 carbon atoms is subjected to a proteobacterial metabolization under a dissolved oxygen concentration of 0.1 to 8 mg/L. 
     
     
         10 . The method for manufacturing a plant activator of  claim 9 , wherein the fatty acid is liquid at a temperature of 20° C. 
     
     
         11 . The method for manufacturing a plant activator of  claim 9 , wherein the proteobacteria is a proteobacteria pre-cultured to 1×10 8  to 9×10 10  cells/mL. 
     
     
         12 . The method for manufacturing a plant activator of  claim 9 , wherein the step for fatty acid metabolism is performed in the presence of at least one type of mineral selected from Mg, P, Na and K. 
     
     
         13 . The method for manufacturing a plant activator of  claim 9 , wherein the plant activator comprises a biosurfactant. 
     
     
         14 . The method for manufacturing a plant activator of  claim 9 , wherein the step for fatty acid metabolism is performed under a condition of temperature from 10 to 40° C. 
     
     
         15 . The method for manufacturing a plant activator of  claim 9 , wherein the plant activator serves as a resistance-inducing agent. 
     
     
         16 . The method for manufacturing a plant activator of  claim 9 , wherein the plant activator serves as a prophylactic agent for a wilt disease in solanaceous plants.