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Effect of inoculation with arbuscular mycorrhizal fungi on the degradation of DEHP in soil

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Journal of Environmental Sciences 2004年第3期16卷 458-461页

作者： WANGShu-guang LINXian-gui YINRui HOUYan-lin ResearchCenterforEco-EnvironmentalSciences.ChimeseAcademyofSciences.Beijing100085.China InstituteofSoilScience ChineseAcademyofSciences.Naujing210008.China

The effect of inoculation with arbuscular mycorrhizal(am) fungi( Acaulospora lavis ) on the degradation of di(2 ethylhexyl) phthalate(DEHP) in soil was studies. Cowpea plants (Pigna sinensis) were used as host plants and grown in a specially designed rhizobox. The experimental results indicated that, both in sterile and non sterile soil, mycorrhizal colonization rates were much higher in the mycorrhizal plants than in the non mycorrhizal plants. Addition of 4 mg/kg DEHP slightly affected mycorrhizal colonization, but the addition of 100 mg/kg DEHP significantly decreased mycorrhizal colonization. DEHP degradation in the mycorrhizosphere(Ms) and hyphosphere(Hs), especially in the Hs, increased after inoculation with Acaulospora lavis . It is concluded that mycorrhizal hyphae play an important role in the plant uptake, degradation and translocation of DEHP. The mechanism might be attributed to increased numbers of bacteria and actinomycetes and activity of dehydrogenase, urease and acid phosphatase in the Ms and Hs by mycorrhizal fungi.

关键词： am fungi inoculation DEHP concentration degradation

Arbuscular Mycorrhizal Fungal Colonization at Different Succession Stages in Songnen Saline-Alkali Grassland

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Phyton-International Journal of Experimental Botany 2023年第1期92卷 297-310页

作者： Yajie Liu Yunhui Zhou Linlin Fang Chunxue Yang College of Landscape Architecture Northeast Forestry UniversityHarbin150040China

Arbuscular mycorrhizal(am)fungi can form symbiosis with 90%of the vascular plants and play important roles in ecosystem.To realize the am fungal colonization at different succession stages in saline-alkali land and screen am fungi species with great functions,roots and soil samples were collected from the three succession stages of Songnen saline-alkali grassland.The soil properties and am fungal colonization were measured,and the fungus distributed extensively in three stages was annotated by sequencing for amL1/amL2 target,subsequently,maize was selected as the host to verify its colonization.The results showed that the soil properties improved with the succession of saline-alkali grassland.The plants’communities of the three stages could be colonized by am fungi,and the colonization rate of Leymus chinensis(the third stage)ranged from 66.67%to 100%,Puccinellia tenuiflora(the second stage)ranged from 50%to 80%,while the Suaeda glauca(the first stage)was only 35%–60%.Glomeraceae sp1 was identified as the dominant am fungi species which occurred frequently in the succession of saline-alkali land with the isolation frequency,relative abundance,and importance value of 100%,18.1%,and 59.1%,respectively.The colonization rate of Glomeraceae sp1 in maize ranged from 80%to 87%and similar mycorrhizal characteristics were detected in the roots of P.tenuiflora,S.glauca,and L.chinensis,indicating that Glomeraceae sp1 colonized the samples in the field.The correlation matrix indicated that colonization rate,colonization intensity,and vesicle abundance were closely related to soil conditions most,and they were related significantly to all the soil properties except cellulase activity.Besides,redundancy analysis(RDA)showed that soil properties drove the changes of am fungal colonization and sporulation.These results will provide theoretical support for realizing the relationship between am fungal colonization and soil conditions,and also for the exploration of am fungi species with great functions.

关键词： Succession of saline-alkali land soil properties am fungi colonization characteristics

Arbuscular mycorrhizal fungi associated with the clonal plants in Mu Us sandland of China

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Progress in Natural Science:Materials International 2007年第11期17卷 1296-1302页

作者： Zhao Jinli and He Xueli(College of Life Sciences, Hebei University, Baoding 071002, China) College of Life Sciences Hebei University Baoding 071002 China

Clonal plants in Mu Us sandland change the sandy enviroment. The clonal plant is a kind of resource in restoration of the Mu Us sandy landscape. Soil samples at depth of 50 cm in the rhizosphere of the clonal plants were collected in 4 replicates at each location and divided into sections corresponding to 0—10, 10—20, 20—30, 30—40 and 40—50 cm depths in two representative sites from north to south in Mu Us sandland, northwestern China, in July 2005. Clonal plants included Psammochloa villosa and Hedysarum laeve. The colonization and ecological distribution of arbuscular mycorrhizal (am) fungi were investigated in the rhizosphere of clonal plants in Mu Us sandland. The results showed that the clonal plants established well symbiosis with am fungi; am fungal species and spatial distribution were significantly related with the host plants and soil factors. Of 16 am fungal taxa in three genera isolated and identified, Glomus multicaule was only observed in the rhizosphere of Psammochloa villosa; Glomus aggregatum, Glomus hydembadensis, Glomus constrictum and Acaulospora rehmii only appeared in the rhizosphere of Hedysarum leave. The depth of soil layers observably affected the spore density and the frequency of colonization (%F). The maximal %F and spore density occurred in the 10—20 cm layer at the site of Ordos Sandy Land Ecological Station, but which occurred in the 0—10 cm layer in Shanxi Yulin Rare Sandy-plants Conversation Field. am fungal status and colonization might be used to monitor desertification and soil degradation.

关键词： am fungi clonal plants Mu Us sandland

Vegetation cover density and disturbance affected arbuscular mycorrhiza fungi spore density and root colonization in a dry Afromontane forest, northern Ethiopia

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Journal of Forestry Research 2018年第3期29卷 671-682页

作者： Emiru Birhane Nakiguli Fatumah Kidane Gidey amanuel Zenebe Ssemwanga Mohammed Department of Land Resources Management and Environmental Protection Mekelle University Faculty of Environmental Sciences and Natural Resource Management Norwegian University of Life Sciences Institute of Climate and Society Mekelle University Department of Geography Geo-Informatics and Climatic Sciences Makerere University

Arbuscular mycorrhiza fungi(amF) are vital in the regeneration of vegetation in disturbed ecosystems due to their numerous ecological advantages and therefore are good indicators of soil and ecosystem health at large. This study was aimed at determining how the seasonal, vegetation cover density, edaphic and anthropogenic factors affect amF root colonization(RC) and spore density(SD)in Desa’a dry Afromontane forest. amF RC and SD in the rhizosphere of five dominant woody species, Juniperus procera, Olea europaea, Maytenus arbutifolia, Carissa spinarum and Dodonaea angustifolia growing in Desa’a forest were studied during the rainy and the dry seasons in three permanent study vegetation cover density plots(dense, medium, and poor). Each plot(160 x40 m2) has two management practices(fenced and unfenced plots) of area. A 100 g sample of rhizosphere soil from moisturefree composite soil was used to determine spore density.Spore density ranged from 50 to 4467 spores/100 g soil,and all species were colonized by amF within a range of 4–95%. Glomus was the dominant genus in the rhizosphere of all species. Vegetation cover density strongly affected SD and RC. The SD was significantly higher(p amF SD and RC, with the fenced plots being more favoured. Seasons significantly(p amF SD and RC with soil physical and chemical properties showed no significant difference(p> 0.05) except for total nitrogen. Disturbance, vegetation cover density, season and total nitrogen are significant factors that control the dynamics and management interventions to maintain the forest health of dry Afromontane forests.

关键词： am fungi Disturbance Dry Afromontane forest Season Vegetation cover density

Study the effects of am fungi on the content of flavonoids under different levels of nitrogen in Clematis intricate

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Study the effects of AM fungi on the content of flavonoids u...

Tree species as hosts for arbuscular mycorrhizal and dark septate endophyte fungi

中国植物学会第十六次全国会员代表大会暨85周年学术年会

作者： Ting Liu Hongjiao Li Xingjiao Sun Xiao Li Tebuqin Borjigin College of Medicine Inner Mongolia Medical University College of Mongolian Medicine Inner Mongolia Medical University

Clematis intricate is a kind of Mongolian medicinal plants,its effective components are flavonoids.This study investigated the content of flavonoids on different levels of nitrogen（N） under inoculated with a am fungus Funneliformis mosseae in clematis intricate.The experiment was set up with six N levels,0 N,10%N,20%N,50%N,100%N,200%N,and set samples inoculated and non-inoculated with am fungi,each treatment was repeated 3 times,6 month old seedlings were used for this study.The content of total flavonoids in plants was significantly increased by inoculating with am fungi at different N levels.Under the condition of 0 N-20%N,the content of total flavonoids in inoculated ones were significantly higher than that of non-inoculated ones,then at the condition of 50% N-200% N the content of total flavonoids in inoculated ones were not significantly different with that of non-inoculated ones.The content of total flavonoids reached the highest at 10% N in inoculated ones.The expression of key enzymes of flavonoid biosynthesis genes（CiPAL,CiCHS,CiCHI,CiF3H,CiFLS and CiDFR） in inoculated ones were determined by qRT-PCR.Under different N levels,the expression of CiPAL in 10% N and 20% N levels increased,and at other levels were down regulated;CiCHS and CiCHI expression was down regulated at 50% N,and at other levels were increased,whereas the expression of CiFLS in 20% N increased,at other levels were down regulated.From the study,we know that at different levels of nitrogen,inoculated with am fungi can significantly improve the total flavonoids in Clematis intricate.

关键词： am fungi Clematis intricate Mongolian medicinal plants flavonoids nitrogen

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Journal of Forestry Research 2012年第4期23卷 641-649页

作者： E.Uma K.Sathiyadash J.Loganathan T.Muthukumar Root and Soil Biology Laboratory Department of BotanyBharathiar UniversityCoimbatore 641046Tamil NaduIndia

A survey of 35 tree species （belonging to 28 genera in 19 families） in Aliyar, South India was carried out to ascertain their arbuscular mycorrhizal （am） and dark septate endophyte （DSE） fungal status. All the tree species examined had am association. am and DSE coloni- zation is reported for the first time in 20 and 14 species respectively. Co- occurrence of am and DSE was observed in 14 （40%） tree species. The extent of DSE colonization was inversely related to the extent of am fungal colonization. Six tree species had Arum-type, 18 had intermediate- type and 11 had typical Paris-type am morphology. am fungal spore morphotypes belonging to 11 species in two genera were isolated from the rhizosphere soil. am fungal spore numbers were not related to the ex- tent of am colonization and Glomus dominated spore diversity. am association individually and along with DSE were found respectively in the 63% and 44% of the economically important tree species. The occur- rence of am and DSE fungal association in economically important indigenous tree species indicates the possibility of exploiting this asso- ciation in future conservation programmes of these species.

关键词： tree species am fungi Arum-, Paris-, intermediate- type dark septate endophyte （DSE）

Rhizophagus irregularis influences As and P uptake by alfafa and the neighboring non-host pepperweed growing in an As-contaminated soil

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Journal of Environmental Sciences 2018年第5期30卷 36-44页

作者： Xin Zhang Baihui Ren Songlin Wu Yuqing Sun Baodong Chen Ruojuan Li State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Yunnan Forestry Technological College Kunming 650224China

It was documented that arbuscular mycorrhiza fungi（amF） play an important role in protecting host plants against arsenic（As） contamination. However, most terrestrial ecosystems contain a considerable number of nonmycorrhizal plants. So far little information is available for the interaction of such non-host plants with amF under As contaminations. By using a dual compartment cultivation system with a plastic board or a nylon mesh separating roots of non-host pepperweed from roots of the am-host alfafa plants, avoiding direct root competition, the two plant species were grown separately or partially separated（with rhizosphere effects） in the presence or absence of the amF Rhizophagus irregularis in As-contaminated soil. The results indicated that mycorrhiza caused phosphorus（P） concentration decrease in the non-host pepperweed, but promoted the P concentration of the am host alfafa. Mycorrhiza is potentially helpful for non-host pepperweed to adapt to As contamination by decreasing root As concentration and showing no suppressing effect on biomass production. The study provides further evidence for the protective effects of amF on non-host plants against As contamination, and improved our understanding of the potential role of amF for non-host plant adaptation to As contaminated soils.

关键词： am fungi Arsenic contamination Non-host plant Interaction

Combining Metabolomics and Gene Expression Analysis Reveals that Propionyl- and Butyryl- Carnitines Are Involved in Late Stages of Arbuscular Mycorrhizal Symbiosis

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Molecular Plant 2014年第3期7卷 554-566页

作者： Jerome Laparre Universite de Toulouse UPS UMR 5546 Laboratoire de Recherche en Sciences Vegetales BP 42617 F-31326 Castanet-Tolosan France CNRS UMR 5546 BP 42617 F-31326 Castanet-Tolosan France Universite de Toulouse INSA UPS INP LISBP Toulouse France INRA UMR792 Ingenierie des Systemes Biologiques et des Procedes Toulouse France CNRS INRA Toulouse France CNRS UMR5504 Toulouse France

The arbuscular mycorrhizal （am） symbiosis is a widespread mutualistic association between soil fungi （Glomeromycota） and the roots of most plant species. am fungi are obligate biotrophs whose development is partially under the control of their plant host. We explored the possibility to combine metabolomic and transcriptomic approaches to find putative mycorrhiza-associated metabolites regulating am fungal development. Methanol extracts of Medicago truncatula roots colonized or not with the am fungus Rhizophagus irregularis were analyzed and compared by ultra- high-performance liquid chromatography （UHPLC）, high-resolution mass spectrometry （Q-TOF）, and multivariate statisti- cal discrimination. We detected 71 mycorrhiza-associated analytes exclusively present or at least 10-fold more abundant in mycorrhizal roots. To identify among these analytes those that could regulate am fungal development, we fraction- ated by preparative and semi-preparative HPLC the mycorrhizal and non-mycorrhizal root extracts and established how the 71 analytes were distributed among the fractions. Then we tested the activity of the fractions on germinating spores of R. irregularis by quantifying the expression of 96 genes known for their diverse in planta expression patterns. These investigations reveal that propionyl- and butyryl-carnitines accumulated in mycorrhizal roots. The results suggest that these two molecules regulate fungal gene expression in planta and represent interesting candidates for further biologi- cal characterization.

关键词： metabolomics am fungi symbiosis plant metabolites carnitines transcriptomic screening.

Alleviation of Cadmium Toxicity to Medicago Truncatula by amF Involves the Changes of Cd Speciation in Rhizosphere Soil and Subcellular Distribution

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Phyton-International Journal of Experimental Botany 2021年第2期90卷 403-415页

作者： Yuying Jiang Renhua Huang Lei Jiang Ke Chen Wenkun Zhu School of Life Science and Engineering Southwest University of Science and TechnologyMianyang621010China State Key Laboratory of Environmentally Friendly Energy Materials National Collaborative Innovation Center for Nuclear Waste and Environmental SafetySchool of National DefenceSichuan Civil-Military Integration InstituteSouthwest University of Science and TechnologyMianyang621010China

Arbuscular mycorrhizal fungi(amF)can improve plant tolerance to several abiotic stresses,including heavy metals,drought or salinity exposure.However,the role of amF in alleviation of soil cadmium(Cd)-induced toxicity to plants is still largely unknown.In this study,Cd speciation in soil and subcellular distribution of Cd were used to characterize the roles of application am fungi in the alleviation of Cd toxicity in alfalfa plants.Our results showed that the addition of Glomus mosseae in Cd contaminated soil(10 mg/Kg)significantly increased soil pH,cation exchange capacity(CEC)and organic matter in rhizosphere soil with Medicago truncatula L.,and then account for significantly decreased contents of exchangeable and carbonate-bounded Cd speciation in rhizosphere soil,indicating alleviation of plant toxicity by reduction of bioavailable fractions of Cd.Although there is no significant difference found in Cd accumulation by roots and shoots respectively between Cd and am-Cd treatments,more portion of Cd was recorded compartmentalization in cell wall fraction of both root and shoot in treatment of Cd with am application,indicating alleviation of Cd toxicity to plant cell.Herein,application of am fungi in Cd treatments performed to inhibit the appearance of Cd toxicity symptoms,including the improvement of leaf electrolyte leakage,root elongation,seedling growth and biomass.This information provides a clearer understanding of detoxification strategy of am fungi on Cd behavior with development and stabilization of soil structure and subcellular distribution of plant.

关键词： am fungi cadmium toxicity Cd form subcellular compartmentalization phytoremediation