硝酸镧对蒲葵幼苗耐寒性生理指标的影响(英文)

Effect of La(NO_3)_3 on the Physiological Indices of Cold Tolerance in Livistona chinensis Seedlings

用0、100、200、300、400、500、600 mg/L硝酸镧溶液喷施蒲葵幼苗叶片作为处理,每天喷施1次,连续3 d。在20、5、12和10℃下分别处理24 h后测定叶片的丙二醛、可溶性糖和叶绿素含量以及叶绿素a/b的比值。结果表明:硝酸镧溶液处理的幼苗丙二醛含量都比对照低,而且随温度变化幅度小,而可溶性糖和叶绿素含量及叶绿素a/b比值均比对照高。硝酸镧处理可有效改善上述蒲葵幼苗的耐寒性生理指标,其中300 mg/L硝酸镧溶液对提高蒲葵幼苗的耐寒性生理指标具有显著的效应。

The effect of La（NO3）3 on the physiological indices of cold tolerance in Livistona chinensis seedlings was conducted,The L.chinensis seedlings were sprayed with 0,100,200,300,400,500,600 mg/L La（NO3）3 solution,the contents of malondialdehyde（MDA）,soluble sugar,chlorophyll and chlorophyll a/b ratio of L.chinensis seedlings were determined under 20,5,12 and 10 ℃ for 24 h,respectively,The results of the MDA contents with La（NO3）3 treatments were lower than those of the control,and changed slowly under temperature stress,and the contents of soluble sugar,chlorophyll and chlorophyll a/b ratio increased compared with the control.It was concluded that La（NO3）3 agents could boost the physiological indices of cold tolerance in L.chinensis.And the appropriate concentration which significantly affected the physiological indices of cold tolerance was 300 mg/L.