31 Advances in Environmental Biology, 2(1): 31-39, 2008 ISSN 1995-0756
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31 Advances in Environmental Biology, 2(1): 31-39, 2008 ISSN 1995-0756
31 Advances in Environmental Biology, 2(1): 31-39, 2008 ISSN 1995-0756 © 2008, American-Eurasian Network for Scientific Information This is a refereed journal and all articles are professionally screened and reviewed O RIGINAL A RTICLE Biodiversity of Arbuscular Mycorrhizal Fungi in China: a Review Fa Yuan Wang, and Zhao Yong Shi Agricultural College, Henan University of Science and Technology, Luoyang, H enan Province, 471003, P.R. China Fa Yuan W ang, and Zhao Yong Shi,: Biodiversity of Arbuscular M ycorrhizal Fungi in China: a Review, Adv. Environ. Biol., 2(1): 31-39, 2008 ABSTRACT In the symbiotic associations of plant and fungi, arbuscular mycorrhiza, which is formed between plants and Glomeromycota fungi, has the widest distribution in the nature. AM fungi inhabit a variety of ecosystems including agricultural lands, forests, grasslands and many stressed environments, and colonize the roots of most plants, including bryophyte, pteridophyte, gymnosperm and angiosperm. A total of 122 AM fungi species within 11 genera, including 8 new species, have been reported in various environments in China since 1980’s. Advances in the last 20 years in AM fungal biodiversity, including species diversity, habitat diversity and host diversity, are reviewed in this paper. Some future trends in the biodiversity of AM fungi are also discussed. Key words: Arbuscular mycorrhiza, Species diversity, Habitat diversity, Host diversity, China Introduction Arbuscular mycorrhizal (AM) fungi are extremely comm on symb ioses in terre strial ecosystems, associating with about 80% of plant families worldwide. They are recognized as an important, widespread component of most terrestrial ecosystems, benefiting plant establishment by enhancing plant nutrient acquisition, improving soil quality, and increasing resistance to environmental stresses[53], and also playing an important role in plant biodiversity, ecosystem variability and productivity. According to the latest taxonomy, AM fungi belong to the Glomeromycota phylum, including 4 families and 12 genera. To date, although only fewer than 200 species of AM fungi have been described[44], numerous studies on AM fungal diversity in different ecosystems worldwide have shown that AM fungi distribute globally[57]. China is situated in the eastern part of Asia, with a coastline of 18, 000 km and a total land area of 9.6 million km 2 . Its territory extends over 50° of latitude from north to south, embracing the equatorial belt, the tropics, the subtropics, the moderate temperate zone, and the cold temperate zone. From east to west, China extends over 62° of longitude with land covered by forests, grasslands, deserts, plains, hills, and mountains. China has a marked continental monsoonal climate characterized by great variety. Northerly winds prevail in winter, while southerly winds reign in summer. China has 94.97 million ha of cultivated land, 400 million ha of grasslands, and 133.7 million ha of forests. The diversity of plant species in China is extraordinary, about 30,000 or one eighth of the world total. Studies on AM fungal biodiversity in China began in the 1980’s. In 1984, Tang and Zang reported the first new AM fungus Glomus citricolum[54]. Thereafter, more and more survey work and classification of AM fungi within China were carried out. Over the past 20 years, more than 100 papers on AM fungal biodiversity have been published. This review aims to summarize the advances in AM fungal biodiversity, including species diversity, habitat diversity and host diversity within China. Corresponding Author Fa Yuan Wang, Agricultural College, Henan University of Science and Technology, Luoyang, Henan Province, 471003, P.R. China. E-mail: [email protected]; [email protected] Adv. Environ. Biol., 2(1): 31-39, 2008 32 Table 1: AM fungi reported in China AM fungus References Acaulospora bireticulata Rothwell & Trappe Peng et al, 1990 [42] Acaulospora capsicula Blaszk. Cai et al., 2007 [4] Acaulospora cavernata Blaszk. Zhang et al., 2007 [94] Acaulospora delicata W alker, Pfeiffer & Bloss Zhao et al., 2006 [95] Acaulospora denticulata Sieverding & Toro W u et al., 1995 [75] Acaulospora dilatata M orton Zhang et al., 1998 [87] Acaulospora elegans Trappe & Gerd. H u, 1988 [24] Acaulospora excavata Ingleby & W alker Zhang et al., 2001 [90] Acaulospora foveata Trappe & Janos W u and Chen, 1986 [69] Acaulospora gedanensis B³aszk. Gao et al., 2006 [16] Acaulospora koskei Blaszk. Zhang and Guo, 2005 [93] Acaulospora lacunosa M orton Gai and Liu, 2000 [13] Acaulospora laevis Gerd. & Trappe W u and Chen,1986 [69] Acaulospora longula Spain & Schenck Zhang and W ang, 1991 [83] Acaulospora m ellea Spain & Schenck H u, 1988 [24] Acaulospora m orrowae Spain & Schenck H u, 1988 [24] Acaulospora m yriocarpa Spain & Schenck H u, 1988 [24] Acaulospora nicolsonii W alker, Reed & Sanders Zhang et al., 2007 [94] Acaulospora polonica Blaszk. Zhang et al., 2001 [90] Acaulospora rehm ii Sieverd. & Toro Shi et al., 2003 [49] Acaulospora rugosa M orton Zhang et al., 1998 [87] Acaulospora scrobiculata Trappe W u and Chen, 1986 [69] Acaulospora spinosa W alker & Trappe H u, 1988 [24] Acaulospora taiwania H u* H u, 1988 [24] Acaulospora tuberculata Janos & Trappe Zhao and Du, 1997 [96] Acaulospora undulata Sieverd. Zhang et al., 2001 [90] Am bispora leptoticha W alker, Vestberg & Schuessler H u, 1988 [24] Archaeospora trappei (Am es & Linderm an) M orton & Redecker emend Spain W u and Chen, 1986 [69] D iversispora spurca (Pfeiff., W alker & Bloss) W alker & Schüssler Zhang et al., 2007 [94] D iversispora versiform e (Karst) Berch Zhang and W ang, 1991 [83] Entrophospora baltica Blaszk., M adej & Tadych Cai et al., 2007 [4] Entrophospora infrequens (H all) Am es & Schneid. W u and Chen, 1986 [69] G igaspora decipiens H all & Abbott Liu et al., 2002 [36] G igaspora gigantea (N icol. & Gerd.) Gerd. & Trappe W u and Chen, 1986 [69] G igaspora m argarita Becker & Hall Peng et al., 1990 [42] G igaspora ramisporophora Spain, Sieverd. & Schenck Cai et al., 2007 [4] G lom us aggregatum Schenck & Sm ith H u, 1988 [24] G lom us albidum W alker & Rhodes W ang and Hu, 1989 [63] G lom us ambisporum Sm ith & Schenck W ang and Hu, 1989 [63] G lom us australe (Berk.) Berch Zhang et al., 2003 [92] G lom us badium O ehl, Redecker & Sieverd. Zhang et al., 2007 [94] G lom us brohultii H errera, Ferrer & Sieverd. Bao et al., 2007 [3] G lom us caledonium (N icolson & Gerd.) Trappe & Gerd. W u and Chen, 1986 [69] G lom us canadense (Thaxter) Trappe & Gerd. Shi et al., 2004 [51] G lom us citricolum Tang & Zang* Tang and Zang, 1984 [54] G lom us claroideum Schenck & Sm . em end W alker & Vestberg Peng et al., 1990 [42] G lom us clarum N icolson & Schenck H u, 1988 [24] G lom us clavisporum (Trappe) Alm eida & Schenck W u and Chen, 1986 [69] G lom us constrictum Trappe Fang et al., 1986 [10] G lom us convolutum Gerd. & Trappe Zhang et al., 2003 [[92] G lom us corem ioides (Berk. & Broom e) Redecker & M orton W u and Chen, 1986 [69] G lom us coronatum Giovann. Zhang et al., 2007 [94] G lom us cunnigham ia H u* H u, 1988 [24] G lom us delhiense M ukerji, Blattacharjee & Tewari Liu et al., 2001 [37] G lom us diaphanum M orton & W alker Peng et al., 1990 [42] G lom us dim orphicum Boyetchko & Tewari W ang et al., 1998 [67] G lom us dolichosporum Zhang & W ang* Zhang et al., 1997 [86] G lom us eburneum Kenn., Stutz & M orton W ang et al., 2006 [64] G lom us etunicatum Becker & Gerd. W u and Chen, 1986 [69] G lom us fasciculatum (Thaxter) Gerdem ann & Trappe em end. W alker & Koske W u and Chen, 1986 [69] G lom us flavisporum (Lange & Lund) Trappe & Gerd. Gao et al., 2006 [16] G lom us formosanum W u & Chen* W u and Chen, 1986 [69] G lom us fulvum (Berk. & Broom e) Trappe & Gerd. W u et al., 2001 [73] G lom us geosporum (N icol. & Gerd.) W alker W ang and Hu, 1989 [63] G lom us gibbosum Blaszk. Zhang et al., 2003 [92] G lom us globiferum Koske & W alker Zhang et al., 2003 [92] G lom us glom erulatum Sieverd. Liu et al., 2001 [37] G lom us halonatum Rose & Trappe Ren et al., 2005 [45] G lom us heterosprum Sm ith & Schenck Zhang et al., 2003 [92] G lom us hoi Berch & Trappe W ang and Hu, 1989 [63] ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Adv. Environ. Biol., 2(1): 31-39, 2008 33 Table 1: Continued G lom us hyderabadensis Swarapu, Kunwar, Prasad & M anohar W ang et al., 2006 [64] G lom us intraradices Schenck & Sm ith Fang et al., 1986 [10] G lom us inverm aium H all Gao et al., 2006 [16] G lom us lam ellosum Dalpe, Koske & Tews Zhang et al., 2007 [94] G lom us liquidam baris (W u & Chen) Alm eida & Schenck* W u and Chen, 1987 [70] G lom us macrocarpum Tul. & Tul. H u, 1988 [24] G lom us luteum Kenn., Stutz & M orton Zhang and Guo, 2005 [93] G lom us m agnicaule H all Shi et al., 2003 [49] G lom us m anihotis H oweler, Sieverd. & Schenck W u et al., 1994 [74] G lom us melanosporum Gerd. & Trappe W ang and Liu, 2002 [59] G lom us microaggregatum Koske, Gem m a & O lexia Zhang et al., 1996 [85] G lom us microcarpum Tul. & Tul. H u, 1988 [24] G lom us monosporum Gerd. & Trappe Zhao, 1998 [97] G lom us mosseae (N icol. & Gerd.) Gerd. & Trappe Fang et al., 1986 [10] G lom us m ulticaule Gerd. & Bakshi Zhao and Du, 1997 [96] G lom us m ultiforum Tadych & Blaszk. Zhao et al., 2006 [95] G lom us pakistanica Iqbal & Bushra H u, 1988 [24] G lom us pallidum H all Peng et al., 1990 [42] G lom us pansihalos Berch & Koske W ang and Liu, 2002 [59] G lom us pustulatum Koske, Friese, W alker & D alpe W ang and Liu, 2002 [59] G lom us reticulatum Bhattacharjee & M ukerji Gai et al., 2000 [15] G lom us rubiform e Gerdem ann & Trappe W u and Chen, 1986 [69] G lom us sinuosum Alm eida & Schenck W ang et al., 1992 [62] G lom us spinosum H u* H u, 2002 [25] G lom us taiwanense (W u & Chen) Alm eida & Schenck* W u and Chen, 1987 [70] G lom us tenebrosum (Thaxt.) Berch W ang and Liu, 2002 [59] G lom us tortuosum Schenck & Sm ith W u et al., 2000 [72] G lom us verruculosum Blaszk. Li et al., 2004 [30] G lom us viscosum N icolson Li et al., 2004 [30] G lom us zaozhuangianus W ang & Liu* W ang and Liu, 2002 [60] Kuklospora colom biana Spain & Schenck Zhang et al., 2003 [92] Kuklospora kentinensis W u & Liu* W u et al., 1995 [71] Pacispora boliviana O ehl & Sieverd. Gao et al., 2006 [16] Pacispora chim onobam busae (W u & Liu) W alker, Vestberg & Schuessler * W u et al., 1995 [71] Pacispora scintillans W alker, Vestberg & Schuessler H u, 1988 [24] Paraglom us occltum (W alker) M orton & Redecker Peng et al., 1990 [42] Scutellospora aurigloba (H all) W alker & Sanders Peng et al., 1990 [42] Scutellospora calospora (N icolson & Gerd.) W alker & Sanders H u, 1988 [24] Scutellospora cerradensis Spain & M iranda W ang et al., 2006 [64] Scutellospora coralloidea (Trappe, Gerd. & H o) W alker & Sanders Pan et al., 1997 [41] Scutellospora dipurpurescens M orton & Koske Zhao et al., 2006 [95] Scutellospora erythropa (Koske & W alker) W alker & Sanders Pan et al., 1997b [41] Scutellospora fulgida Koske & W alker W ang et al., 1998 [67] Scutellospora gilm orei (Trappe & Gerd.) W alker & Sanders H u, 1988 [24] Scutellospora gregaria (Schenck & N icol.) W alker & Sanders Zhao, 1998 [97] Scutellospora heterogam a (N icol. & Gerd.)W alker & Sanders W u et al., 1994 [74] Scutellospora nigra (Redhead) W alker & Sanders H u, 1988 [24] Scutellospora pellucida (N icol. & Schenck) W alker & Sanders H u, 1988 [24] Scutellospora persica (Koske & W alker) W alker & Sanders Zhao, 1998 [97] Scutellospora reticulata (Koske, M iller & W alker) W alker & Sanders W ang et al., 1998 [67] Scutellospora trirubiginopa Pan & Zhang* Pan et al., 1997 [40] Scutellospora verrucosa (Koske & W alker) W alker & Sanders Y ang et al., 2004 [78] N ote: The scientic nam es are am ended according to the internet inform ation (http://www.lrz-m uenchen.de/~schuessler/am phylo/); * N ew species from China. AM fungal species diversity A total of 122 AM fungi species within 11 genera have been reported in the rhizosphere of different plants in various environments of China, including 12 new species (Table 1). The most common and widely distributed genera is Glomus (64 species), and then Acaulospora (26 species) and Scutellospora (16 species). AM fungal habitat diversity It has been shown th a t, besides farmlands[14,42,83], fruit lands[28,34], vegetable lands[65], forest lands[11,24], grasslands[3,5,61,76], AM fungi occurred widely in tropical rain forests[49,50,98,99], tropical virgin forests[19], tropical secondary forest[11], artificial forests[20,81], natural secondary forests [8], greenhouse vegetable la n d [ 3 5 ] , n atura l re se rve s[4 5 ,7 2 ], a ltip la n o grassland[5]. AM fungi occurred in all kinds of landforms all over the China, such as mountains[52,83], plateaus[5,40,41], hills[13], plains[13], islands[35], basin[65]. However, AM fungal biodiversities differ from different soil climatic zones, varying with various environmental factors[87,88]. In recent years, AM fungal diversities in fragile ecosystems and polluted environments received more attraction, such as deserts [2, 27, 56], saline-alkaline Adv. Environ. Biol., 2(1): 31-39, 2008 34 Table 2: Plant species reported to be AM in China Food crops [14,39,42,65,83,85,91] Arachis hypogaea L. Pisum satuvum L. Avena nuda L. Sesam um indicum L. Eriogonum fasciculatum Benth. Setaria italica (L.) Beauv. G lycine max M errill. Sorghum vulgare Pers. H ordeum vulgare L. Triticum aestivum L. Ipom oea batatas (L.) Lam . Vigna rabiata (Linn.)W ilczek M anihot esculenta Crant. Vicia gem im iflora Trautv. O ryza sativa L. Zea m ays L. Econom ic crops [10,39,42,63,91] Agave sisalana Perrine. G ossypium arboreum Linn. Boehm eria nivea (L.) H elianthus annuus L. Cam ellia sinensis (L.) O . Kuntze. M orus alba L. Cannabis sativa L. Nicotiana tabacum L. Coffea arabica L. Piper nigrum L. G audich H evea brasiliensis M üll.Arg Saccharum sinense L. Fruits [4,34,39,54,66,74,83,84,85,100] Actinidia chinensis Planch. G ingko biloba L. Ananas comosus (L.) M err. Juglans regia L. Averrhoa caram bola L. Litchi chinensis Sonn. Canarium album Raeusch M acadam ia ternifolia F.M uell Carica papaya L. M alus pum ila M ill. Carya cathayensis Sargent. M angifera indica L. Castanea m ollissim a Blum e. M anilkara zapota (Linn.) Van Royen. Citrus aurantium L. M orus alba L. Citrus grandis O sbeck. M usa sapientum L. Citrus lim on Burm ann M yrica rubra Sieb. et Zucc. Citrus sinensis O sbeck. Pistacia vera L. Citrus sunki Hot. Prunus arm eniaca L. Cocos nucifera L. Prunus cerasus L. Corylus heterophylla Fisher. Prunus m um e Siebold & Zucc. Crataegus pinnatifolia Bunge. Prunus persica L. D im ocarpus longana Lour. Prunus salicina Lindl. D iospyros kaki Lf. var. dom estica Psidium guajava L. M akino. Punica granatum L. Eriobotrya japonica Lindley. Pyrus bretschneideri Rehd. Ficus carica L. Rubus occidentalis L. Fortunella m argarita (Lour.) Swingle Vitis vinifera L. Fragaria x ananassa D uch. Zizyphus jujuba M ill. Vegetables [33,39,42,43,83,84,91] Allium cepa L. Lactuca sativa L. Allium fistulosum L. Lnffa cylindrica Rom e. Allium fistulosum Linn. Lycopersicon esculentum M ill. Allium porrum L. M om ordica charantia L. Allium sativum Linn. Phaseolus vulgaris L. Allium tuberosum Rottl. Phaseolus vulgaris Linn. Am aranthus mangostanus L. Pim pinella brachycarpa N akai. Apium graveolens L. Pisum sativum L. Asparagus officinalis L. Solanum m elongena L. Capsicum annuum L. Solanum tuberosum L. Citrullus lanatus (Thunb.) Spinacia oleracea L. M atsum and Nakai Toona sinensis (Juss.) Roem . Cucum is sativus L. Vigna sesquipedalis Koern D aucus carota L. Vigna unguiculata (L.) W alp. D ioscorea batatas D ecne Zanthoxylum schinifolium Zucc. Ipom oea aquatica Forsk. Zingiber officinale Roscoe Lablab purpureus (L.) Sweet Zizania caduciflora H and. Flowers [22,31,33,39,81,84] Aloe vera L. Lilium longiflorum Thum b. Cym bidium ensifolium Sw. Lonicera japonica Thunb. D endranthem a m orifolium Ram M im osa pudica L. G erbera Jam esonii Bolus M yosotis sylvatica Ehrh.ex H offm . G ladiolus gandavensis Van H outte Paeonia suffruticosa Andrews. G ynostemm a pentaphylla (Thunb.) Petunia hybrida Vilm . M akino Rosa chinenses Jacq. H am elia patins Rosa x hybrida H ort. Jasm inum sam bac (L.) Ait. Saintpaulia ionantha H .W endl. Leucaene leucocephala (Lam .) de W it. M edical plants [17,29,39,46,67,68,77,79,84] Atractylodes macrocephala Koidz. Panax notoginseng (BurK1) F1H 1C hen D atura stram onium L. Panax quiquefolium L. G entiana scabra Bge. Phellodendren am urense Rupr. Lonicera japonica Thunb. Platycodon grandiflorus (Jacq.) A. DC. Lycium chinensis M ill. Salvia m iltiorrhiza Bunge M entha haplocalyx Briq. Schizonepeta tenuifolia Briq. Panax ginseng CA M ey Scutellaria laterifolia L. ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Adv. Environ. Biol., 2(1): 31-39, 2008 Table 2: Continued Forage grasses [3,5,39,76,84] W ild weeds [1,7,13,15,36,59,84] Forest trees [1,9,12,19,20,21,24,49,50,69,72,83,86] 35 M edicago sativa L. Trifolium repens L Trifolium pretense L. Aeluropus littoralis var. sinensis D ebx. Agrostis stolonifera L. Alopecurus aequalis Sobol. Artemisia lavandulaefolia DC. Arthraxon hispidus (Thunb.)M akino Belam canda chinensis (L.) DC. Brom us rem otiflorus (steud.) Ohwi Cirsium setosum (W illd.) M B. D endranthem a indicum (L.) D es M oul. D igitaria ciliaris (Retz.) Koel. D igitaria sanguinalis (L.) Scop. Eleusine indica (L.) Gaertn Eragrostis pilosa (L.)Beauv. Erigeron acris L. Abies fargesii Franch Acacia L. Alnus L. Betula alnoides H am lit Burretiodendron hsienmu Chun et H ow Cunningham ia lanceolata (Lam b.) Hook. Cupressus L. D ipterocarpaceae soils[48,55,59,82], degraded grasslands[61], eroded soils[40,41], sewage irrigated soils[18], petroleum polluted soils[26], coal mine heaps[61], heavy metal polluted soils[32], mining disturbed soils[90], mine tailings[6], abandoned mine lands[32]. AM fungal host diversity AM fungi are ubiquitous in natural ecosystems, associating with about 80% of terrestrial plant species wo rld wid e[53]. M ost plant phyla, includ ing b r yo p h y te , p t e r id o p h y t e , g y m n o s p e r m a n d angiosperm, are all able to form mycorrhizae with AM fungi. In China, crops, wild plants, tropical plants, alpine plants, halophytes, xerophyte, hydrophyte, geophyte, parasitic plants, are all found to be mycorrhizal. Only a few families, such as C y p e r a c e a e , B r a s s ic a c e a e , C a r yo p h ylla c e a e , Juncaceae, Chenopodiaceae and Amaranthaceae, are assumed never to form mycorrhizal associations or to do so rarely[23]. In recent years, mycorrhizae on plants of these families have been observed, such as Cyperaceae[38], Amaranthaceae[1,7,80], Caryophyllaceae[7], and Chenopodiaceae[36,59]. China has about 30,000 plant species, accounting for about one eighth of the world total. Chinese researchers have done a considerable amount of work on the mycorrhizal status of plant species in terrestrial ecosystems and have examined a total of nearly 800 plant species belonging to 150 families. These plants include food crops, economic crops, vegetables, fruits, ornamental plants, Chinese medical plants, wild weeds, trees, etc (Table 2). Interestingly, even some forest trees, such as Eucalyptus and Dipterocarpaceae, usually considered to be typically ectomycorrhizal, have been recently found to have AM colonization[20,49,50]. Aneurolepidium chinense (Trin) Kitag. Festuca rubra L. Leymus chinensis (Trin.) Tzvel. Eulalia specisa (Debeaux)Kuntze Im perata cylindrica var. m ajor (N ees) C.E. H ubb. Kum m erowia striata (Thunb.) Schindl. O rostachys fim briatus (Turcz.)Berger Papaver nudicaule L. Plantago asiatica L. Poa pratensis L. Polypogon fugax N ees ex Steud. Puccinellia distans (L.) Parl. Setaria viridis (L.)Beauv. Vitex negundo Linn.var. heterophylla (Franch) Eucalypt us L. Fagaceae Phoebe L. Poplus L Q uercus L. Schim a superba Gardner & Cham p. Sophora L. Taiwania cryptom erioides H ayata U lm us pum ila L. Future study Although considerable research efforts have been carried out on AM fungal biodiversity, these studies are unsystematic and not enough and most are limited on regional scale or on specific host plants. China has a large area of land and diverse ecosystems with various environmental factors, thus A M fungal germ plasms may be abundant. Unfortunately, so far, only 8 new AM fungal species have been reported in China. Obviously, maybe a large number of unknown AM fungal species need to be explored, which must be firstly strenghthened in the future. Secondly, AM biodiversity in special habitats especially in extreme environments needs more attention. These AM species may have specific genes that allow them to resitant extreme environmental conditions, which may be of great value in future agriculture or environetal remediation such as bioremediation with mycorrhizae. The relative genes need to be cloned and identified. Furthermore, AM fungal genetic diversity needs to be studied and effective molecular tools need to be developed. Most above-mentioned studied by Chinese researchers on the taxonomy and identification of AM fungi still are based on the morphology of their spores, but the morphological characters of spores are sometimes variable, which may lead to incorrect results. Effective molecular tools have recently been developed to identify AM fungi and a new monophyletic phylum, the Glomeromycota, for AM fungi has been established b ased o n SS U rRN A ge ne sequences[47,58]. It is therefore important and urgent for Chinese scientists to manipulate these molecular tools in future studies on the biodiversity and ecology of AM fungi in China. Adv. Environ. Biol., 2(1): 31-39, 2008 36 Acknowledgments This work is supported by Talent Foundation of Henan University of Science and Technology (05008) and the Scientific Research Foundation of Henan University of Science and Technology (2006ZY035). 11. 12. References 1. Bao, Y.Y. and W . Yan, 2004. Arbuscular Mycorrhizae and their Structural Types on Common Plants in Grasslands of Midwestern Inner Mongolia. Biodiversity Science, 12: 501508. (in Chinese) 2. Bao, Y.Y., F. Sun and W . Yan, 2005. Preliminary Study on Arbuscular Mycorrhizaes and their Morphological Types of Common Plants in Inner Mongolia Desert Region. Journal of Arid Land Resources and Environment, 19(3): 180-184. (in Chinese) 3. Bao, Y.Y., W . Yan and M.Q. Zhang, 2007. Arbuscular M ycorrhizal Fungi Associated with Common Plants in Grassland of Inner M ongolia. Mycosystema, 26(1): 51-58. (in Chinese) 4. Cai, B.P., Y. Zhang, J.Y. Chen, Q.X. Zhang and L.D. Guo, 2007. 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