Four in vitro experiments were set up to verify the colonization potential of ectomycorrhizal (EcM) Cenococcum geophilum FR. (strain CGE-4), saprotrophic Geomyces pannorum (LINK) SIGLER & CARMICHAEL (GPA-1) and a frequent root-associated, potentially ericoid mycorrhiza (ErM)-forming Meliniomyces variabilis Hambleton & Sigler (MVA-1) in roots of Rhododendron and Vaccinium. A typical ErM fungus, Rhizoscyphus ericae (Read) Zhuang & Korf (RER-1), was included for comparison. All fungal strains intracellularly colonized rooted Vaccinium microcuttings: GPA-1 occasionally produced hyphal loops similar to ErM, MVA-1 and RER-1 exhibited a typical ErM colonization pattern. CGE-4 hyphae grew vigorously on and around newly formed roots and rarely penetrated turgescent rhizodermal cells forming intracellular loose loops. Rooting of Rhododendron sp. microcuttings was not promoted by any fungal strain except CGE-4, which also promoted the most vigorous growth of Rhododendron ponticum L. seedlings. The widespread EcM fungus C. geophilum has a potential to colonize non-EcM roots and support their development which may influence overall growth of ericaceous plants. As shown for G. pannorum, structures resembling ErM may be formed by fungi that are to date not regarded as ericoid mycorrhizal.

译文

:进行了四个体外实验,以验证外生菌根(EcM)Cenococcum geophilum FR的定殖潜力。 (菌株CGE-4),腐生的土壤霉菌(LINK)SIGLER&CARMICHAEL(GPA-1)以及在杜鹃花的根部经常与根相关的潜在类脂状菌根(ErM)形成变种Meliniomyces variabilis Hambleton&Sigler(MVA-1)和牛痘。为了进行比较,还包括了一种典型的ErM真菌,Rhizoscyphus ericae(Read)Zhuang&Korf(RER-1)。所有真菌菌株在细胞内定殖的生根越桔微切屑:GPA-1偶尔会产生类似于ErM,MVA-1和RER-1的菌丝环,表现出典型的ErM定殖模式。 CGE-4菌丝在新形成的根部及其周围旺盛生长,很少穿透形成根际的松散环状的根皮状根皮细胞。杜鹃花的生根。除CGE-4外,任何真菌菌株均不促进微切屑的形成,CGE-4也促进了杜鹃杜鹃幼苗的最旺盛生长。广泛分布的EcM真菌C. geophilum具有在非EcM根部定植并支持其发育的潜力,这可能会影响菊科植物的整体生长。如对于潘诺氏菌(G.pannorum)所示,类似于ErM的结构可以由迄今为止尚未被认为是类胡萝卜素菌根的真菌形成。

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