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首页> 外文期刊>Mycologia >Competition and substrate colonization strategies of three polyxenically grown arbuscular mycorrhizal fungi.
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Competition and substrate colonization strategies of three polyxenically grown arbuscular mycorrhizal fungi.

机译：三种多菌种生长的丛枝菌根真菌的竞争和底物定殖策略。

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摘要

Intra- and extraradical colonization competition and hyphal interactions among arbuscular mycorrhizal fungi (AMF) Glomus intraradices, Glomus proliferum and Gigaspora margarita were investigated in two in vitro experimental systems. AMF were polyxenically cultured with a Ri T-DNA transformed carrot root organ culture (ROC) in either big Petri plates containing three culture compartments and a common hyphal compartment (i.e. an independent host root for each AMF) or two by two in the culture compartment of regular bicompartmented Petri dishes (i.e. a common host root and a common hyphal compartment). Maps of the extraradical mycelial development of the three AMF were obtained. Two distinct substrate colonization strategies (Glomus-type and Gigaspora-type) were identified, reflecting intrinsic differences among AMF genera/families. Our data reveal a general lack of antagonism between the isolates when extraradical hyphae explore and exploit the substrate outside the root influence zone; however certain growth restrictions were imposed by Gi. margarita extraradical mycelium when developing near the host root and by G. proliferum intraradical hyphae. This work highlights once more the appropriateness of AM in vitro culture systems to perform in vivo studies on the biology of this symbiosis and opens new avenues to the formulation of in vitro AMF inoculants..
机译：在两个体外实验系统中，调查了丛枝菌根真菌（AMF）Glomus intraradices，Glomus proliferum和Gigaspora margarita的自由基内外自由基竞争和菌丝相互作用。将AMF与Ri T-DNA转化的胡萝卜根器官培养物（ROC）在包含三个培养室和一个公共菌丝室的大陪替氏培养皿中多异种培养（即每个AMF的独立宿主根），或在培养室中两两培养常规的双室陪替氏培养皿（即共同的宿主根和共同的菌丝室）。获得了三个AMF的根外菌丝发育图。确定了两种不同的底物定殖策略（Glomus型和Gigaspora型），反映了AMF属/家族之间的内在差异。我们的数据显示，当根外菌丝探索并利用根部影响区以外的底物时，分离株之间通常没有拮抗作用;但是Gi施加了某些增长限制。玛格丽塔根外菌丝体在寄主根附近发育并由G. proliferum根内菌丝形成。这项工作再次强调了AM体外培养系统对这种共生生物学进行体内研究的适用性，并为体外AMF接种剂的配制开辟了新途径。

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