Arbuscular mycorrhizal fungi enhance antioxidant defense in the leaves and the retention of heavy metals in the roots of maize
Arbuscular mycorrhizal fungi enhance antioxidant defense in the leaves and the retention of heavy metals in the roots of maize
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DOI：
10.1007/s11356-018-2487-z
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发表时间：
2018-06
影响因子：
5.8
通讯作者：
F. Zhan;Bo Li;Ming Jiang;Xianrong Yue;Yong-mei He;Yun-sheng Xia;Youshan Wang
中科院分区：
文献类型：
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作者：
F. Zhan;Bo Li;Ming Jiang;Xianrong Yue;Yong-mei He;Yun-sheng Xia;Youshan Wang
通过盆栽试验，研究了苔藓漏斗菌根真菌（AMF）和多样性菌根真菌（diverspora spurcuma）对重金属污染土壤中玉米（Zea maysL.）生长、抗氧化生理和磷(P)、硫(S)、铅（Pb）、锌（Zn）、镉（Cd）、砷（As）吸收的影响。苔藓显著提高了植物叶绿素a含量、株高和生物量；h2o2和丙二醛（MDA）含量降低；提高了玉米叶片超氧化物歧化酶（SOD）、过氧化氢酶（CAT）活性和总抗氧化能力（T-AOC）；d组没有观察到这种效应。spurcum。BothF。mosseaeandD。刺激促进了重金属在根系中的滞留，增加了对Pb、Zn、Cd和As的吸收，抑制了重金属的转移，导致地上部Pb、Zn和Cd含量下降。因此，真菌降低了玉米重金属含量（TF）和吸收（TF '）的转运因子。此外,F。苔藓促进了嫩枝对磷和硫的吸收；刺激增加了根对磷和硫的吸收。抗氧化能力与H2O2、MDA、重金属含量呈极显著负相关，与玉米叶片生物量呈极显著正相关。这些结果表明，AMF减轻了植物毒性，其作用与玉米叶片的抗氧化活性和根系重金属潴留增加密切相关。
In this study, we investigated the effects of the arbuscular mycorrhizal fungi (AMF)Funneliformis mosseaeandDiversispora spurcumon the growth, antioxidant physiology, and uptake of phosphorus (P), sulfur (S), lead (Pb), zinc (Zn), cadmium (Cd), and arsenic (As) by maize (Zea maysL.) grown in heavy metal-polluted soils though a potted plant experiment.F. mosseaesignificantly increased the plant chlorophyll a content, height, and biomass; decreased the H2O2and malondialdehyde (MDA) contents; and enhanced the superoxide dismutase (SOD) and catalase (CAT) activities and the total antioxidant capacity (T-AOC) in maize leaves; this effect was not observed withD. spurcum. BothF. mosseaeandD. spurcumpromoted the retention of heavy metals in roots and increased the uptake of Pb, Zn, Cd, and As, and both fungi restricted heavy metal transfer, resulting in decreased Pb, Zn, and Cd contents in shoots. Therefore, the fungi reduced the translocation factors for heavy metal content (TF) and uptake (TF′) in maize. Additionally,F. mosseaepromoted P and S uptake by shoots, andD. spurcumincreased P and S uptake by roots. Moreover, highly significant negative correlations were found between antioxidant capacity and the H2O2, MDA, and heavy metal contents, and there was a positive correlation with the biomass of maize leaves. These results suggested that AMF alleviated plant toxicity and that this effect was closely related to antioxidant activation in the maize leaves and increased retention of heavy metals in the roots.