重金属胁迫下外源钛铁试剂对冬珊瑚幼苗根系发育、生物量累积及其分配格局的影响  

Effects of Tiron on Root Development,Biomass Accumulation and Allocation of Solanum pseudocapsicumSeedlings under Heavy Metal Stress

作　　者：瞿静[1] 吴楚[1] 

机构地区：[1]长江大学园艺园林学院,湖北荆州434025

出　　处：《长江大学学报（自科版）（中旬）》2014年第8期55-59,7-8,共5页Journal of Yangtze University(Nature Science Edition)

基　　金：湖北省教育厅科学研究项目(B20101301)

摘　　要：汞(Hg)可抑制植物的生长发育,对植物具有明显的毒害作用。探讨了不同浓度的钛铁试剂(Tiron)对汞胁迫下的冬珊瑚(Solanum pseudocapsicum)幼苗根系生长、生物量累积及其分配的影响。结果表明:加入5μmol·L-1钛铁试剂后,冬珊瑚幼苗总根长、总投影面积、总表面积比对照增加;随着外加钛铁试剂浓度的升高,总根长、总表面积和总投影面积呈现逐渐降低的变化趋势,根系体积随钛铁试剂处理浓度增加而增加;根系根尖数随着钛铁试剂处理浓度的增加而减少,表明钛铁试剂对Hg毒性的缓解作用随着钛铁试剂浓度的升高而减弱,高浓度的钛铁试剂对植物表现出毒害作用。无论钛铁试剂的处理浓度如何,冬珊瑚异速生长指数都小于1,这表明在冬珊瑚幼苗阶段,生长偏向于地上部分。随着外加钛铁试剂浓度的升高,异速生长指数随着浓度的增加而增大,这表明随着外源钛铁试剂的浓度增加,植物生物量的分配越向地下分配。Mercury is toxic to plants and inhibits growth and development of plants.In order to provide base for practical use of Tiron in phytomediation of land the effects of Tiron on root growth,biomass accumulation and allocation of Solanum pseudocapsicum seedlings under mercury stress were studied.The results showed that under heavy metalstress the treatment of treatment 5μmol·L-1 increased total root length,project area and total root surface area.But as the concentrations of Tiron increased,the three parameters decreased,total root volume and root tips increased.Under all treatments of Tiron,allometric index were less than 1,suggesting biomass allocation is prone to shoots.But as concentrations of Tiron increased,allometric index increased,suggesting Tiron treatment could increase biomass allocation to roots.

关 键 词：钛铁试剂 冬珊瑚 (Solanum pseudocapsicum) 重金属胁迫 根生长 生物量分配 

分 类 号：Q945.78[生物学—植物学]