Inducement of Salicylic Acid in Cucumber Cotyledons by Neodymium and Lanthanum

作     者：张鹏英 陈靠山 

作者机构：College of Life Sciences Shandong University 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2007年第25卷第4期

页      面：502-507页

核心收录：

学科分类：07[理学] 09[农学] 0903[农学-农业资源与环境] 0902[农学-园艺学] 090202[农学-蔬菜学] 0713[理学-生态学] 

基　　金：Project supported by the Hi-Tech Research and Development"863"Program of China (2002AA244031) 

主　　题：La^3+ Nd^3+ cucumber salicylic acid resistance rare earths 

摘      要：The cotyledons of cucumber were used to investigate the effects of Nd^3＋ and La^3＋ on physiological characters in respect of plant resistance. The cucumber cotyledons were sprayed with 15 μg · ml^-1· Nd^3＋ and La^3＋, and the changers on salicylic acid （SA） and SA 2-O-β-glucoside （SAG） contents, the generation of ·O2^-, and β-1,3-glucanase and chitinase activities were measured. The results demonstrated that the yields of endogenous SA and SAG in cucumber cotyledons were enhanced significantly in a short time in response to Nd^3＋ and La^3＋ treatments. At 3 h after La^3＋ treatment, the levels of SA and SAG reached the maximum, with 4.3 and 3.3-fold of that in control （CK）, respectively. At 12 h after Nd3＋ treatment, the contents of SA and SAG reached peak levels, increased by 4.5 and 3.0-fold of that in control （CK）, respec- tively. These two components were kept in a higher level up to 72 h after treatment. The generation rate of · O2^- increased gradually in the treatments of Nd^3＋ or La^3＋, and then decreased in cucumber at 12 h. β-1,3-glucanase activity reached peak at 3 h, while chitinase activity reached peak at 12 h, and then both decreased gradually in Nd^3＋ or La^3＋ treatments. At 72 h after treatment, activities of β-1, 3-glucanase and chitinase increased by about 30% and 50%, as compared with CK. Therefore, these results suggested that both Nd^3＋ and La^3＋ could increase the contents of endogenous SA and its related factors which induce plant resistance through the signal pathway of the salicylic acid.