镧的植物防病效果及其生物学效应  

Control Effect of Lanthanum Against Plant Disease

作　　者：慕康国[1] 赵秀琴[2] 刘亚佳[3] 胡林[1] 张文吉[3] 崔建宇[1] 

机构地区：[1]中国农业大学资源环境学院,北京100094 [2]中国农科院作物所,北京100081 [3]中国农业大学理学院,北京100094

出　　处：《中国稀土学报》2006年第4期489-494,共6页Journal of the Chinese Society of Rare Earths

基　　金：北京市重点自然基金项目(6001001);中美合作草坪养护管理研究项目(美国俄勒冈种子理事会OSCMAP资助)

摘　　要：通过灭菌土接种Rhizoctonia solani以及混合接菌Rhizoctonia solani和Fusarium solani进行盆栽试验,分别研究了镧浸种处理对高羊茅及板蓝根出苗、生长发育的影响。结果表明,镧浸种能明显地减少病原菌的侵染,对由其所造成的种腐、芽腐及根腐等有显著的防治效果,提高了板蓝根和高羊茅种子的出苗率。同时,镧浸种在适当的浓度范围内,还能显著地促进植物的生长发育,生物量明显增加。利用盆栽水稻试验研究了稀土镧对水稻纹枯菌(Rhizoctonia solani)的毒力,测定结果表明,镧喷施于水稻植株上对水稻纹枯病有明显的防治效果,且在活体条件下,喷施镧后1和7 d对水稻纹枯菌(Rhizoctonia solani)的有效中浓度分别为128.7和128.1 mg.L-1,均明显低于离体条件下的有效中浓度(171.9 mg.L-1)。Effect of La on emergence, growth and development of Isatis indigotica Fort. and Festuca arundinacea seedlings was researched by pot experiments of inoculating Rhizoctonia solani and the mixture of Rhizoctonia solani and Fusarium solani in disinfected soil after the seeds were soaked in the solution with different concentrations of La^3＋ . The results indicate that infection rate is decreased and there are significant disease controlling effects on seed rot, bud rot and root rot caused by pathogenic fungi when the seeds are soaked by La^3＋ . Thus, the rates of emergence of Isatis indigotica Fort. and turfgrass Festuca arundinacea are increased. When La^3＋ concentration is in a proper range, the growth and development of plant seedlings are promoted. Spraying La in rice plants shows a significant controlling effect on Rhizoctonia solani. Furthermore, the EC50 of La^3＋ performed at 1 and 7 d after spraying La in rice plants are 128.7 and 128.1 mg·L^-1 respectively. The ECho of La^3＋ performs in vivo （in rice plant） is lower than that in vitro （171.9 mg·L^-1）.

关 键 词：镧 防病效果 生物学效应 稀土 

分 类 号：S432.26[农业科学—植物病理学] S432.23[农业科学—农业昆虫与害虫防治]