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丛枝菌根真菌对镉胁迫下芦竹生长、光合特性和矿质营养的影响
滕秋梅1, 张中峰1, 李红艳2, 徐广平1, 周龙武1, 黄玉清3
1.广西喀斯特植物保育与恢复生态学重点实验室,广西壮族自治区中国科学院广西植物研究所;2.长江大学园艺园林学院;3.广西师范学院
摘要:
为揭示丛枝菌根真菌(Arbuscular mycorrhizal fungi,AMF)对芦竹耐镉(Cd)胁迫的作用及其机理,采用大棚盆栽试验,利用丛枝菌根真菌(AMF)摩西管柄囊霉(Funneliformis mosseae,FM)、根内根孢囊霉(Rhizophagus intraradices,RI)、地表球囊霉(Glomus versiforme,GV)进行接种试验,研究了在Cd胁迫下接种AMF对芦竹生长、光合特性、矿质营养的影响。结果表明:AMF能够显著改善Cd胁迫下芦竹的生长状况,与对照相比,接种处理芦竹的株高增加19.09% ~ 27.98%,叶长增加12.18% ~ 31.06%,叶绿素相对含量SPAD值增加8.55% ~ 9.36%,地上和根系生物量分别增加20.08% ~ 31.41%、12.24% ~ 24.12%,最大净光合速率增加7.08% ~ 32.12%,芦竹根系全磷含量增加30.26% ~ 46.05%。接种处理后芦竹地上Cd含量介于68 ~ 105.97 mg/kg,显著高于对照处理(42.20 mg/kg),根系Cd含量介于113.07 ~ 221.47 mg/kg,显著高于对照处理(46.47 mg/kg),且根系Cd含量显著高于地上部。Cd胁迫下不同AMF菌种对芦竹产生的效应有差异,其中,RI处理对芦竹株高、叶长促进效应最好,经GV处理的芦竹全氮、全磷、全钾含量以及Cd含量最高。Cd胁迫下接种AMF能促进芦竹的生长,增强其光合作用,提高全氮、全磷、全钾吸收量,同时增强了芦竹对Cd的吸收。该研究表明芦竹–丛枝菌根共生体对重金属Cd具有较强的固持作用,在Cd污染土壤修复中具有潜在应用价值。
关键词:  丛枝菌根真菌  芦竹    污染  土壤修复
DOI:10.13758/j.cnki.tr.2020.06.016
分类号:S154.4;Q945.79
基金项目:国家自然科学基金项目(31960272,41603079,31760162)、广西重点研发计划项目(桂科AB18126065)和广西科技公关计划项目(桂科攻1598016-12)资助。
Effects of Arbuscular Mycorrhizal Fungi on Growth, Photosynthesis Characteristics and Mineral Nutrition of Arundo donax Under Cd Stress
TENG Qiumei1, ZHANG Zhongfeng1, LI Hongyan2, XU Guangping1, ZHOU Longwu1, HUANG Yuqing3
1.Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuangzu Autonomous Region and Chinese Academy of Sciences;2.College of Horticulture and Gardening, Yangtze University;3.Nanning Normal University
Abstract:
A greenhouse pot experiment was conducted using Funneliformis mosseae (FM), Rhizophagus intraradices (RI), and Glomus versiforme (GV) of arbuscular mycorrhizal fungi (AMF) to reveal the effect and mechanism of AMF inoculation on Cd stress tolerant of Arundo donax. The results showed that under Cd stress, AMF inoculation significantly improved the plant growth, compared with the control, plant height increased by 19.09% - 27.98%, leaf length increased by 12.18% - 31.06%, chlorophyll content SPAD value increased by 8.55% - 9.36%, biomass of aboveground and belowground increased by 20.08% - 31.41% and 12.24% - 24.12%, maximum net photosynthetic rate increased by 7.08% - 32.12%, and P content in roots increased by 30.26% - 46.05%. After AMF inoculation, Cd content in Arundo donax was between 68 - 105.97 mg/kg, significantly higher than that of the control (42.20 mg/kg). Cd content in roots ranged from 113.07 to 221.71 mg/kg, significantly higher than the control (46.47 mg/kg). The effects of different AMF strains on plant under Cd stress were different, for example, RI treatment had the best effect on plant height and leaf length, while total N, total P, total K and Cd contents were the highest under GV treatment. This study showed that AMF inoculation under Cd stress can promote the plant growth, enhance plant photosynthesis, increase the absorption of N and P and K, and enhance plant absorption to Cd. The Arundo donax-arbuscular mycorrhizal symbiont has a potential application in remediating Cd contaminated soil.
Key words:  Arbuscular mycorrhizal fungi  Arundo donax  Cd  Pollution  Soil remediation

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