We investigated the functional significance of extraradical mycorrhizal networks produced by geographically different isolates of the arbuscular mycorrhizal fungal (AMF) species Glomus mosseae and Glomus intraradices. A two-dimensional experimental system was used to visualize and quantify intact extraradical mycelium (ERM) spreading from Medicago sativa roots. Growth, phosphorus (P) and nitrogen (N) nutrition were assessed in M. sativa plants grown in microcosms. The AMF isolates were characterized by differences in extent and interconnectedness of ERM. Phenotypic fungal variables, such as total hyphal length, hyphal density, hyphal length per mm of total or colonized root length, were positively correlated with M. sativa growth response variables, such as total shoot biomass and plant P content. The utilization of an experimental system in which size, growth rate, viability and interconnectedness of ERM extending from mycorrhizal roots are easily quantified under realistic conditions allows the simultaneous evaluation of different isolates and provides data with a predictive value for selection of efficient AMF.

译文

:我们调查了丛枝菌根真菌(AMF)物种Glomus mosseae和Glomus intraradices的地理上不同的分离物产生的自由基外菌根网络的功能意义。二维实验系统用于可视化和量化从紫花苜蓿根部传播的完整的根外菌丝体(ERM)。在微观世界中评估了苜蓿植物的生长,磷(P)和氮(N)营养。 AMF分离株的特征是ERM的程度和相互连接性不同。表型真菌变量,例如总菌丝长度,菌丝密度,每毫米总或定殖根长度的菌丝长度,与苜蓿生长反应变量(如总枝生物量和植物P含量)呈正相关。在实际条件下容易量化从菌根根延伸的ERM的大小,生长速度,生存力和相互连接性的实验系统,可以同时评估不同的分离物,并为选择有效AMF提供具有预测价值的数据。

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