Toxicity of Lanthanum Against Rhizoctonia solani and Its Effect on Disease-Related Enzymes
来源期刊：JOURNAL OF RARE EARTHS2005年第2期
论文作者：Hu Lin Zhang Wenji Zhang Fusuo Mu Kangguo Cui Jianyu
Key words：botany; lanthanum; Rhizoctonia solani; toxicity; enzyme activity; rare earths;
Abstract: The inhibition of lanthanum (La) to mycelial growth and three disease-related enzymes of Rhizoctonia solani were studied. The results showed that lanthanum inhibits the growth of Rhizoctonia solani strongly. EC50 and EC95 of La were 171.9 and 667.7 mg · L-1 measured in solid culture media respectively, while 111.4 and 500.7 mg · L-1 measured in liquid culture media respectively. Lanthanum also has activating effects on disease-related enzymes of the fungus such as pectinase, protease and cellulase. However, the quantity or the activity of the total enzymes decreases significantly because of the strong blockage of mycelial growth when the La2O3 concentration is over 50 mg · L-1, and the virulence of pathogen decreases as well.
Hu Lin1，Zhang Wenji2，Zhang Fusuo1，Mu Kangguo1，Cui Jianyu1
(1.College of Recourse and Environmental Science, China Agricultural University, Beijing 100094, China;
2.College of Science, China Agricultural University, Beijing 100094, China)
Abstract:The inhibition of lanthanum (La) to mycelial growth and three disease-related enzymes of Rhizoctonia solani were studied. The results showed that lanthanum inhibits the growth of Rhizoctonia solani strongly. EC50 and EC95 of La were 171.9 and 667.7 mg · L-1 measured in solid culture media respectively, while 111.4 and 500.7 mg · L-1 measured in liquid culture media respectively. Lanthanum also has activating effects on disease-related enzymes of the fungus such as pectinase, protease and cellulase. However, the quantity or the activity of the total enzymes decreases significantly because of the strong blockage of mycelial growth when the La2O3 concentration is over 50 mg · L-1, and the virulence of pathogen decreases as well.
Key words:botany; lanthanum; Rhizoctonia solani; toxicity; enzyme activity; rare earths;
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