Cd、Pb对银杏根系离子微域分布影响研究  

Effects of Cd and Pb Stress on the Micro-distribution Analysis of the Across Sections of Ginkgo Root

作　　者：朱宇林[1] 曹福亮[2] 汪贵斌[2] 谭萍[1] 

机构地区：[1]玉林师范学院,广西玉林537000 [2]南京林业大学森林资源与环境学院,江苏南京210037

出　　处：《江西农业大学学报》2010年第2期345-349,共5页Acta Agriculturae Universitatis Jiangxiensis

基　　金：江苏省高科技项目(BG2004314)

摘　　要：为阐明重金属在银杏(Ginkgo biloba L.)根尖微区中的富积特性及对其它选择性吸收离子的作用机理,采用X线电子探针技术研究Cd、Pb对银杏根系中离子微域分布的影响。结果表明,Cd、Pb处理后在表皮、皮层、韧皮部和木质部细胞中均可发现Cd2+、Pb2+的积累。Cd、Pb胁迫显著地影响了根系微区的离子分布,使细胞中大多离子的稳态受到破坏,是Cd、Pb对植物产生毒害的机制之一。同时Ca2+和K+在根系微区不同组织中均呈现出较强的峰,Ca2+和K+稳态的维持显示银杏对Cd、Pb胁迫可能具有较强的耐性机制。In order to elucidate deeply and systematically the toxicity and tolerance mechanisms of Ginkgo to heavy metals stress,the micro-distribution analysis of the across sections of Ginkgo root with X-ray microanalysis was studied under cadmium and lead stress.The micro-distribution analysis of the across sections of Ginkgo root with X-ray microanalysis indicated that ion micro-distribution of root was significantly affected by cadmium and lead single and combined pollution.Cd^2＋ and Pb^2＋ accumulation in the epidermis,cortex,phloem and xylem cell of Ginkgo roots was observed.The disrupted balances of most elements of different tissues were one of the pivotal toxicity mechanisms by cadmium and lead stress.Meanwhile the peaks of Ca^2＋ and K^＋ appeared obviously in different tissues.The maintenance of homeostasis of Ca^2＋ and K^＋ revealed that Ginkgo had strong resistance against cadmium and lead stress.

关 键 词：银杏 CD PB X线电子探针 离子微域分布 

分 类 号：S792.95[农业科学—林木遗传育种]