硅对盐胁迫下枣树根尖离子微域分布的影响  

Effects of Silicon on Ion Micro-distribution Status of Ziziphus jujuba cv.Jinsixiaozao Under Salt Stress

作　　者：徐锡增[1] 徐呈祥[2] 

机构地区：[1]南京林业大学森林资源与环境学院,江苏南京210037 [2]金陵科技学院园艺系,江苏南京210038

出　　处：《南京林业大学学报（自然科学版）》2006年第2期85-88,共4页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家自然科学基金资助项目(30471368)

摘　　要：运用X射线电子探针研究了硅对盐胁迫下金丝小枣(Ziziphus jujubacv.Jinsixiaozao)根系中离子微域分布的影响。结果表明:盐胁迫(NaCl质量分数为0.3%)处理使得枣苗根系表皮、皮层和中柱细胞中Na+、Cl-的X射线峰较高,而K+峰较低;而盐胁迫处理加入0.4 g/kg硅后,根系表皮、皮层和中柱细胞中Na+、Cl-的X射线峰显著降低,而K+峰则大幅度提高,并且使Na+、Cl-在根系各部分呈均匀分布。表明盐胁迫下给土壤施硅可改变金丝小枣体内养分离子的吸收和离子的微域分布,从而缓解盐分离子对金丝小枣的毒害作用。The effects of silicon on ion micro-distribution status ba cv. Jinsixiaozao under salt stress were studied with X-ray of root tips in Ziziphusjuju electron probe microanalysis. The results showed that the peak of Na^＋ and Cl^- in the cells of the epidermis, cortex and stele under 0.3% NaCl stress was higher while that of K^＋ was lower. However, after the addition of silicon （0.4 g/kg） to the stressed plants, the contents of Na^＋ and Cl^- in those cells decreased remarkably while that of K^＋ increased significantly. Moreover, Na^＋ and Cl^- were distributed uniformly in all tissues of roots. It indicated that the addition of silicon under salt stress ameliorated the ion imbibtion and the ion micro-distribution status, therefore, it alleviated the toxic effects from salt ions.

关 键 词：硅 盐胁迫 金丝小枣 离子分布 X射线电子探针 

分 类 号：S718.43[农业科学—林学]