The Mycelium Donor Plant system (MDP) was adapted to study the time course of the colonization of Pyrus communis by Rhizophagus irregularis under in vitro conditions. Isolated germinated spores did not colonize pear roots. Inoculum composed of R. irregularis spores/mycelium associated with chicory root fragments was used to inoculate Medicago truncatula which became thereafter the MDP of pear plantlets. Typical intraradical structures (hyphae, arbuscules, spores/vesicles) and appressoria were observed in the pear roots. During acclimatization, the pear plants formed a densely branched root system. R. irregularis colonization not only altered the root architecture but also changed the nutrient composition of the acclimatized pear plantlets.

中文翻译：

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梨（Pyrus communis）的体外菌根。

菌丝体供体植物系统（MDP）适应于研究的定殖的时间过程西洋梨由Rhizophagus irregularis下的体外条件。分离的发芽孢子没有定殖在梨的根部。用由菊苣根碎片结合的不规则红孢菌孢子/菌丝体组成的接种物接种截短苜蓿，此后成为梨小植株的MDP。在梨的根部观察到典型的自由基结构（菌丝，丛状，孢子/小泡）和贴壁虫。在适应过程中，梨子植物形成了密集的分支根系。不规则红球菌 定殖不仅改变了根系结构，还改变了适应的梨苗的营养成分。