文章摘要
AMF对玉米生长、根系低分子有机酸分泌与Cd累积的影响
Effects of AMF on growth, low-molecular-weight organic acids secreted by roots, and Cd uptake in maize
投稿时间:2022-09-20  修订日期:2022-11-30
DOI:10.13254/j.jare.2022.0658
中文关键词: 丛枝菌根真菌,玉米,根袋法,根系分泌物,Cd形态
英文关键词: arbuscular mycorrhizal fungi, maize, root-bag experiment, root exudates, cadmium form
基金项目:国家自然科学基金项目(42177381,42267002);云南省中青年学术和技术带头人后备人才培养项目(202005AC160038);云南省吴龙华专家工作站(202305AF150042)
作者单位E-mail
陈嘉欣 云南农业大学资源与环境学院, 昆明 650201  
颜洁 云南农业大学资源与环境学院, 昆明 650201  
游义红 云南农业大学资源与环境学院, 昆明 650201  
李博 云南农业大学资源与环境学院, 昆明 650201  
和成忠 中国地质调查局昆明自然资源综合调查中心, 昆明 650111  
涂春霖 中国地质调查局昆明自然资源综合调查中心, 昆明 650111  
湛方栋 云南农业大学资源与环境学院, 昆明 650201 zfd97@ynau.edu.cn 
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中文摘要:
      为探讨铅锌矿区丛枝菌根真菌(Arbuscular Mycorrhizal Fungi,AMF)的生态功能,采用云南会泽铅锌矿区周边镉(Cd)污染的农田土壤,开展根袋盆栽试验,研究接种AMF对玉米生长、矿质营养、根系低分子有机酸分泌和Cd累积的影响。结果表明:接种AMF促进玉米生长,显著提高光合速率、株高和生物量;增加植株对氮、磷、钾的吸收,增幅达14.2~19.1倍;并促进根系分泌酒石酸、苹果酸、草酸和琥珀酸,分泌量增幅为1.1~3.8倍。此外,接种AMF使玉米根际铁锰氧化态Cd含量显著增加22.5%,有机结合态Cd含量显著降低12.8%,但交换态和有效态Cd含量无显著变化。接种AMF使玉米地上部和根系Cd含量显著降低,降幅分别为32.7%和77.9%,但地上部和根系Cd累积量显著增加,分别增加了12.5倍和25.8%。相关性分析发现,玉米地上部Cd累积量与草酸、酒石酸、苹果酸、琥珀酸分泌量和铁锰氧化态Cd含量呈极显著正相关。可见,AMF能促进玉米养分吸收,调节根系低分子有机酸分泌与根际Cd形态,降低植株Cd含量,从而促进植株生长。
英文摘要:
      The ecological functions of arbuscular mycorrhizal fungi(AMF)were explored by investigating its effects on maize growth, mineral nutrition, low-molecular-weight organic acid secretion, and Cd uptake via a root-bag experiment in soil polluted with Cd in the Huize lead-zinc mining area of Yunnan Province. The results showed that AMF promoted maize growth and significantly increased photosynthetic rate, plant height, and biomass. The absorption of N, P, and K increased by 14.2–19.1-fold, and tartaric acid, malic acid, oxalic acid, and succinic acid secretion by roots increased by 1.1–3.8-fold. In addition, AMF resulted in a significant increase of 22.5% in iron- and manganese-oxidized Cd content and a significant decrease of 12.8% in organic-bound Cd content in the maize rhizosphere, but no significant change in exchangeable and available Cd content was observed. AMF significantly reduced maize shoot and root Cd content by 32.7% and 77.9%, respectively, but significantly increased Cd accumulation in maize shoot and root by 12.5-fold and 25.8%, respectively. Correlation analysis showed that shoot Cd accumulation presented extremely significant positive correlations with oxalic acid, tartaric acid, malic acid, and succinic acid secretion, and iron- and manganese-oxidized Cd content. Thus, these results showed that AMF can promote the absorption of nutrients in maize, regulate the secretion of low-molecular-weight organic acid and Cd form in the rhizosphere, and reduce maize Cd content, thereby promoting plant growth.
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