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首页> 外文期刊>Mycorrhiza >Differences in the composition of arbuscular mycorrhizal fungal communities promoted by different propagule forms from a Mediterranean shrubland
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Differences in the composition of arbuscular mycorrhizal fungal communities promoted by different propagule forms from a Mediterranean shrubland

机译：地中海灌木丛中不同繁殖体促进的丛枝菌根真菌群落组成的差异

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摘要

As it is well known, arbuscular mycorrhizal (AM) colonization can be initiated from the following three types of fungal propagules: spores, extraradical mycelium (ERM), and mycorrhizal root fragments harboring intraradical fungal structures. It has been shown that biomass allocation of AM fungi (AMF) among these three propagule types varies between fungal taxa, as also differs the ability of the different AMF propagule fractions to initiate new colonizations. In this study, the composition of the AMF community in the roots of rosemary (Rosmarinus officinalis L., a characteristic Mediterranean shrub), inoculated with the three different propagule types, was analyzed. Accordingly, cuttings from this species were inoculated with either AMF spores, ERM, or colonized roots extracted from a natural soil. The AMF diversity within the rosemary roots was characterized using terminal restriction fragment length polymorphism (T-RFLP) of the small subunit (SSU) rDNA region. The AMF community established in the rosemary plants was significantly different according to the type of propagule used as inoculum. AMF taxa differed in their ability to initiate new colonizations from each propagule type. Results suggest different colonization strategies for the different AMF families involved, Glomeraceae and Claroideoglomeraceae colonizing mainly from colonized roots whereas Pacisporaceae and Diversisporaceae from spores and ERM. This supports that AMF taxa show contrasting life-history strategies in terms of their ability to initiate new colonizations from the different propagule types. Further research to fully understand the colonization and dispersal abilities of AMF is essential for their rational use in ecosystem restoration programs.
机译：众所周知，丛枝菌根（AM）的定植可以从以下三种真菌繁殖体开始：孢子，根外菌丝体（ERM）和带有根内真菌结构的菌根根片段。已经表明，在这三种繁殖体之间，真菌类群之间的AM真菌（AMF）的生物量分配有所不同，因为不同AMF繁殖体组分启动新定居的能力也不同。在这项研究中，分析了接种三种不同繁殖体的迷迭香（Rosmarinus officinalis L.，一种典型的地中海灌木）的根中的AMF群落组成。因此，用AMF孢子，ERM或从天然土壤中提取的定植根接种该物种的插枝。迷迭香根中的AMF多样性使用小亚基（SSU）rDNA区域的末端限制性片段长度多态性（T-RFLP）进行了表征。迷迭香植物中建立的AMF群落根据用作接种物的繁殖体的类型而有显着差异。 AMF类群从每种繁殖体启动新定植的能力各不相同。结果表明，针对不同的AMF家族，不同的定殖策略主要是从被定植的根部定殖成伞形科和唇形科，而从孢子和ERM形成的Pacisporaceae和Diverssisporaceae。这支持了AMF分类群在从不同繁殖体类型发起新定居的能力方面显示出截然不同的生活史策略。进一步研究以充分了解AMF的定植和扩散能力对于在生态系统恢复计划中合理使用它们至关重要。

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