稀土元素La对油菜某些生理指标的影响及其临界浓度

Effects of Rare Earth La on Some Physiological Indices of Rape and Its Critical Concentration

摘要: 通过水培试验 ,研究了稀土元素La对油菜生物量和叶绿素含量、硝酸还原酶活性、根系活力、POD活性等一系列生理指标的影响。结果表明 :喷施或根施 0 0 3～ 3mg/kg的La ³⁺对油菜的生长起了一定的促进作用 ,表现为生物量、叶绿素含量、硝酸还原酶活性和根系活力增加 ;而高于 3 0mg/kg浓度的La ³⁺对油菜的生长产生了抑制作用 ,油菜生物量、叶绿素含量、硝酸还原酶活性和根系活力降低 ,POD活性增高。La对油菜的临界浓度为 3 0mg/kg。

Abstract: Effects of lanthanum on the growth and some other physiological indices of rape (Brassica juncea),such as biomass,chlorophyll content,nitrate reductase,root activity,were studied in a solution culture experiment.The results showed that the biomass,chlorophyll content,nitrate reductase activity and root activity increased when 0 03～3 mg/kg La ³⁺ was sprayed or added into the culture solution,and decreased,but POD activity,when more than 30 mg/kg La ³⁺ was added.The critical concentration of lanthanum to rape was suggested to be 30 mg/kg.