丛枝菌根真菌和纳米磁性氧化铁对玉米生长和Fe吸收的影响  

Influence of Arbuscular Mycorrhizal Fungi and Iron Oxide Magnetic Nanoparticles on Maize Growth and Fe-Uptake

作　　者：曹际玲[1,2,3] 冯有智[1,2] 林先贵[1,2] 

机构地区：[1]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,江苏南京210008 [2]中国科学院南京土壤研究所-香港浸会大学土壤与环境联合开放实验室,江苏南京210008 [3]中国科学院大学,北京100049

出　　处：《生态与农村环境学报》2017年第6期555-563,共9页Journal of Ecology and Rural Environment

基　　金：国家自然科学基金面上项目(41371255;41301267)

摘　　要：采用温室盆栽试验方法,模拟不同纳米磁性氧化铁(Fe_3O_4)施加水平(0.1、1.0和10.0 mg·kg^(-1))的土壤,研究接种丛枝菌根(arbuscular mycorrhizal,AM)真菌Glomus caledonium对玉米(Zea mays)植株生长的影响。结果表明,纳米Fe_3O_4在10.0 mg·kg^(-1)施加水平下显著降低(P<0.05)玉米植株地上部和地下部生物量、AM真菌侵染率和玉米植株养分(N、P、Ca、Zn)含量,显著增加(P<0.05)玉米植株地上部Fe含量。与未接种处理相比,在10.0mg·kg^(-1)的纳米Fe_3O_4施加水平下,接种AM真菌显著提高玉米植株总Fe吸收量和地下部Fe含量(P<0.05),但显著降低Fe的转运比率和玉米植株地上部Fe含量(P<0.05),改善玉米植株体内养分含量,最终显著促进玉米植株生长(P<0.05)。该结果表明接种AM真菌可提高Fe在植物根系的分配比例,降低Fe向植株地上部的转运,从而缓解纳米Fe_3O_4对宿主植物的毒害作用。A greenhouse pot experiment was established to investigate the effects of Glomus caledonium on maize( Zea mays) plants under differential levels( 0. 1,1. 0,and 10. 0 mg · kg^(-1)) of nano-iron oxide magnetic nanoparticles(Fe_3O_4) artificially added soils. The results indicate that the high(10. 0 mg·kg^(-1)) application of nano-Fe_3O_4 significantly decreased( P<0. 05) plant biomass of maize,root mycorrhizal colonization rate and plant N,P,Ca,Zn concentration,but significantly increased( P<0. 05) shoot Fe concentration. Compared to the corresponding non-AM fungi-inoculated treatment,inoculating Glomus caledonium significantly increased( P < 0. 05) root Fe concentration and individual Fe acquisition of maize plants,but significantly decreased( P<0. 05) shoot Fe concentration,that eventually significantly increased( P<0. 05) plant biomass of maize with the high nano-Fe_3O_4 applied treatment. These results indicate that AM fungi could alleviate the toxicity of nano-Fe_3O_4 to plants by enhancing Fe partition in roots and reducing the translocation of Fe by maize plants.

关 键 词：纳米FE3O4 GLOMUS caledonium 玉米 Fe吸收 

分 类 号：X171.5[环境科学与工程—环境科学]