Effects of an Arbuscular Mycorrhizal Fungus on the Growth of and Cadmium Uptake in Maize Grown on Polluted Wasteland, Farmland and Slopeland Soils in a Lead-Zinc Mining Area

被引:32
作者
Chen, Jiaxin [1 ]
Guo, Jianfang [1 ]
Li, Zuran [2 ]
Liang, Xinran [1 ]
You, Yihong [1 ]
Li, Mingrui [1 ]
He, Yongmei [1 ]
Zhan, Fangdong [1 ]
机构
[1] Yunnan Agr Univ, Coll Resources & Environm, Kunming 650201, Yunnan, Peoples R China
[2] Yunnan Agr Univ, Coll Hort & Landscape, Kunming 650201, Yunnan, Peoples R China
基金
中国国家自然科学基金;
关键词
arbuscular mycorrhizal fungus; cadmium-polluted soil; root morphology; root exudates; cadmium uptake; PLANT-GROWTH; COLONIZATION; MECHANISMS; ROOTS;
D O I
10.3390/toxics10070359
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Arbuscular mycorrhizal fungi (AMF) exist widely in soil polluted by heavy metals and have significant effects on plant growth and cadmium (Cd) uptake. Cd contents differ among wasteland, farmland and slopeland soils in a lead-zinc mining area in Yunnan Province, Southwest China. The effects of AMF on maize growth, root morphology, low-molecular-weight organic acid (LMWOA) concentrations and Cd uptake were investigated via a root-bag experiment. The results show that AMF increased maize growth on Cd-polluted soils, resulting in increases in root length, surface area, volume and branch number, with the effects being stronger in farmland than in wasteland and slopeland soils; increased malic acid and succinic acid secretion 1.3-fold and 1.1-fold, respectively, in roots on farmland soil; enhanced the iron- and manganese-oxidized Cd concentration by 22.6%, and decreased the organic-bound Cd concentration by 12.9% in the maize rhizosphere on farmland soil; and increased Cd uptake 12.5-fold and 1.7-fold in shoots and by 25.7% and 86.6% in roots grown on farmland and slopeland soils, respectively. Moreover, shoot Cd uptake presented significant positive correlations with root surface area and volume and LMWOA concentrations. Thus, these results indicated the possible mechanism that the increased maize Cd uptake induced by AMF was closely related to their effect on root morphology and LMWOA secretion, with the effects varying under different Cd pollution levels.
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页数:13
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