Effect of Dark Septate Endophytic Fungus Gaeumannomyces cylindrosporus on Plant Growth, Photosynthesis and Pb Tolerance of Maize (Zea mays L.)

BAN Yihui; XU Zhouying; YANG Yurong; ZHANG Haihan; CHEN Hui; TANG Ming

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Effect of Dark Septate Endophytic Fungus Gaeumannomyces cylindrosporus on Plant Growth, Photosynthesis and Pb Tolerance of Maize (Zea mays L.)

机译：深色分隔内生真菌圆孢子菌对玉米（Zea mays L.）植物生长，光合作用和Pb耐性的影响

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Dark septate endophytic (DSE) fungi are ubiquitous and cosmopolitan,and occur widely in association with plants in heavy metal stress environment.However,little is known about the effect of inoculation with DSE fungi on the host plant under heavy metal stress.In this study,Gaeumannomyces cylindrosporus,which was isolated from Pb-Zn mine tailings in China and had been proven to have high Pb tolerance,was inoculated onto the roots of maize (Zea mays L.) seedlings to study the effect of DSE on plant growth,photosynthesis,and the translocation and accumulation of Pb in plant under stress of different Pb concentrations.The growth indicators (height,basal diameter,root length,and biomass) of maize were detected.Chlorophyll content,photosynthetic characteristics (net photosynthetic rate,transpiration rate,stomatal conductance,and intercellular CO2 concentration),and chlorophyll fluorescence parameters in leaves of the inoculated and non-inoculated maize were also determined.Inoculation with G.cylindrosporus significantly increased height,basal diameter,root length,and biomass of maize seedlings under Pb stress.Colonization of G.cylindrosporus improved the efficiency of photosynthesis and altered the translocation and accumulation of Pb in the plants.Although inoculation with G.cylindrosporus increased Pb accumulation in host plants in comparison to non-inoculated plants,the translocation factor of Pb in plant body was significantly decreased.The results indicated that Pb was accumulated mainly in the root system of maize and the phytotoxicity of Pb to the aerial part of the plant was alleviated.The improvement of efficiency of photosynthesis and the decrease of translocation factor of Pb,caused by DSE fungal colonization,were efficient strategies to improve Pb tolerance of host plants.

机译：深色分隔的内生（DSE）内生真菌普遍存在，并且在世界范围内广泛存在，在重金属胁迫环境下与植物密切相关。然而，关于重金属胁迫下接种DSE真菌对寄主植物的影响知之甚少。从中国的Pb-Zn矿山尾矿中分离出的已被证明具有高Pb耐受性的圆柏，接种到玉米（Zea mays L.）幼苗的根部，研究DSE对植物生长，光合作用的影响以及不同浓度铅胁迫下植物体内铅的转运和积累。测定了玉米的生长指标（高度，底径，根长和生物量）。叶绿素含量，光合特性（净光合速率，蒸腾速率，还确定了接种和未接种玉米叶片的气孔导度和细胞间CO2浓度）以及叶绿素荧光参数。圆孢子孢子菌显着增加了铅胁迫下玉米幼苗的高度，基径，根长和生物量。圆孢子菌的定殖提高了植物的光合作用效率并改变了铅的转运和积累。与未接种植物相比，寄主植物中铅的积累明显减少，植物体内铅的转运因子显着降低。结果表明，铅主要积累在玉米的根系中，且铅对植物根部的植物毒性。 DSE真菌定殖引起的光合作用效率的提高和Pb易位因子的降低是提高寄主植物对Pb耐受性的有效策略。

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来源
《土壤圈（英文版）》 |2017年第2期|283-292|共10页
作者
BAN Yihui; XU Zhouying; YANG Yurong; ZHANG Haihan; CHEN Hui; TANG Ming;
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作者单位

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Northwest A&F University,Yangling 712100(China);

School of Chemistry,Chemical Engineering and Life Sciences,Wuhan University of Technology,Wuhan 430070(China);

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Northwest A&F University,Yangling 712100(China);

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Northwest A&F University,Yangling 712100(China);

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Northwest A&F University,Yangling 712100(China);

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Northwest A&F University,Yangling 712100(China);

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Northwest A&F University,Yangling 712100(China);

College of Forestry,Northwest A&F University,Yangling 712100(China);

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
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Effect of Dark Septate Endophytic Fungus Gaeumannomyces cylindrosporus on Plant Growth, Photosynthesis and Pb Tolerance of Maize (Zea mays L.)

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