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首页> 外文期刊>Mycologia >Architecture and developmental dynamics of the external mycelium of the arbuscular mycorrhizal fungus Glomus intraradices grown under monoxenic conditions
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Architecture and developmental dynamics of the external mycelium of the arbuscular mycorrhizal fungus Glomus intraradices grown under monoxenic conditions

机译：一氧化氮条件下生长的丛枝菌根真菌Glomus intraradices外菌丝体的结构和发育动力学

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摘要

The structural development of arbuscular mycorrhiza extraradical mycelium is difficult to follow in soil-based systems. The use of dual arbuscular mycorrhizal fungi/in vitro root organ cultures (monoxenic AM cultures) allowed the nondestructive study of hyphal development following establishment of the symbiosis. It was shown that the extraradical spreading of the arbuscular mycorrhizal fungus Glomus intraradices grown monoaxenically with tomato (cv. Vendor) roots can be divided into 3 stages: (i)proliferation of runner hyphae acting as conducting channels, which divide dichotomously and extend the fungal colony radially; (ii) development of arbuscule-like structures, which are formed at regular intervals along the runner hyphae and which might play a preferential role in nutrient uptake; and (iii) formation of spores in zones already colonized by runner hyphae and arbuscule-like structures. The development of the mycorrhiza is accompanied by changes in the pH of the medium. In particular, pH decreases in zones of the medium in which a high number of arbuscular mycorrhizal fungal spores are formed. The intricate architecture shown by the extraradical mycelium highlights the potential for enhanced nutrient uptake by mycorrhizal roots, and theirrole in the maintenance and amelioration of soil structure.
机译：在土壤基系统中，丛枝菌根自由基菌丝体的结构发育很难遵循。使用双丛枝菌根真菌/体外根部器官培养物（单烯类AM培养物）可以在共生建立后对菌丝发育进行无损研究。结果表明，丛枝菌根真菌球根真菌与番茄（cv。Vendor）单轴生长的根外传播可分为三个阶段：（i）转体菌丝作为传导通道的增殖，其二分分裂并扩展真菌。放射状的殖民地（ii）形成类似丛状的结构，该结构沿跑步者的菌丝以规则的间隔形成，并可能在营养吸收中发挥优先作用; （iii）在已经被亚军菌丝和丛状结构殖民的区域中形成孢子。菌根的发展伴随着培养基pH的变化。特别地，在其中形成大量丛枝菌根真菌孢子的培养基区域中pH降低。根外菌丝体显示出复杂的结构，突出了菌根和养根在土壤结构维持和改善中的养分吸收潜力。

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