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| Effects of arbuscular mycorrhizal fungi and Pb on the growth and La uptake of maize grown in La-contaminated soil |
| Received:December 15, 2019 |
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| KeyWord:arbuscular mycorrhizal fungi;maize;La;Pb;uptake;translocation |
| Author Name | Affiliation | E-mail | | HAO Li-jun | School of Ecology and Environment, Inner Mongolia University, Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, Inner Mongolia Key Laboratory of Environmental Pollution Control and Waste Resource Recycle, Hohhot 010021, China | | | PAN Liang | School of Ecology and Environment, Inner Mongolia University, Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, Inner Mongolia Key Laboratory of Environmental Pollution Control and Waste Resource Recycle, Hohhot 010021, China | | | HAO Bai-hui | School of Ecology and Environment, Inner Mongolia University, Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, Inner Mongolia Key Laboratory of Environmental Pollution Control and Waste Resource Recycle, Hohhot 010021, China | | | XU Jing | School of Ecology and Environment, Inner Mongolia University, Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, Inner Mongolia Key Laboratory of Environmental Pollution Control and Waste Resource Recycle, Hohhot 010021, China | | | ZHOU Xin-nan | School of Ecology and Environment, Inner Mongolia University, Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, Inner Mongolia Key Laboratory of Environmental Pollution Control and Waste Resource Recycle, Hohhot 010021, China | | | YANG Liang | School of Ecology and Environment, Inner Mongolia University, Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, Inner Mongolia Key Laboratory of Environmental Pollution Control and Waste Resource Recycle, Hohhot 010021, China | | | DIAO Feng-wei | School of Ecology and Environment, Inner Mongolia University, Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, Inner Mongolia Key Laboratory of Environmental Pollution Control and Waste Resource Recycle, Hohhot 010021, China | | | GUO Wei | School of Ecology and Environment, Inner Mongolia University, Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, Inner Mongolia Key Laboratory of Environmental Pollution Control and Waste Resource Recycle, Hohhot 010021, China | ndguowei@163.com |
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| Abstract: |
| Here, a greenhouse pot experiment was conducted to investigate the effects of arbuscular mycorrhizal fungi(AMF; G. versiforme, genus Glomus, a species of AMF)and Pb(0, 50 mg·kg-1 and 400 mg·kg-1)on AMF colonization rate, biomass, nutrient uptake, and metal uptake and translocation in maize(Zea mays L.)grown in soil spiked with lanthanum(La)at a concentration of 500 mg·kg-1. The results indicated that the average AMF colonization rate in maize inoculated with G. versiforme ranged from 20.8% to 35.9%, and it decreased with the increase in Pb concentration in soils under La stress. The root colonization rate was significantly decreased by 42% under La500Pb400 (La500Pb400, the soil spiked with 500 mg·kg-1La and 400 mg·kg-1 Pb, the same below)compared with that under La500Pb0. Without AMF inoculation, La500Pb400 decreased the total dry weight, shoot La concentration, and La translocation rate in maize by 24.4%, 73.3%, and 83.5% compared with La500Pb0. The root La concentration in maize was significantly increased by 101.2% under La500Pb400 compared with that under La500Pb0. With AMF inoculation, La500Pb50 significantly increased the total dry weight and La translocation rate in maize by 26.4% and 55.5% compared with La500Pb0. The total dry weight of maize was significantly decreased by 26.1% under La500Pb400 compared with that under La500Pb0. Compared with no inoculation treatment, AMF significantly increased the total dry weight and mineral nutrient content in maize by 70.7%~128.2% and 30.2%~467.1% under the three treatments, respectively. Furthermore, AMF significantly decreased the shoot La concentration and La translocation rate in maize by 52.8% and 59.2% under La500Pb0, and significantly decreased the La translocation rate by 28.6% under La500Pb50 compared with no inoculation treatment. AMF also significantly increased the shoot La concentration and La translocation rate by 110.5% and 147.2% and significantly decreased the root La concentration, and shoot and root Pb concentration by 41.9%, 42.6%, and 28.2% under La500Pb400 compared with no inoculation treatment, respectively. The interaction between AMF and Pb had significant effects on the biomass, shoot and root La concentrations, shoot Pb concentrations, and La translocation rate from the root to shoot in maize. The results demonstrated that Pb could significantly influence the uptake and translocation of La(a rare earth element)by plants and its toxicity on plants; it was related to the concentration of heavy metals and AMF symbiosis with plants. |
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