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首页> 外文期刊>Mycorrhiza >Temporal dynamics of arbuscular mycorrhizal fungi colonizing roots of representative shrub species in a semi-arid Mediterranean ecosystem.
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Temporal dynamics of arbuscular mycorrhizal fungi colonizing roots of representative shrub species in a semi-arid Mediterranean ecosystem.

机译:在半干旱的地中海生态系统中,有代表性的灌木物种的根部丛生的丛枝菌根真菌的时间动态。

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摘要

Arbuscular mycorrhizal (AM) symbiosis plays an important role in improving plant fitness and soil quality, particularly in fragile and stressed environments, as those in certain areas of Mediterranean ecosystems. AM fungal communities are usually affected by dynamic factors such as the plant community structure and composition, which in turn are imposed by seasonality. For this reason, a one-year-round time-course trial was performed by sampling the root system of two representative shrubland species (Rosmarinus officinalis and Thymus zygis) within a typical Mediterranean ecosystem from the Southeast of Spain. The 18S rDNA gene, of the AM fungal community in roots, was subjected to PCR-SSCP, sequencing, and phylogenetic analysis. Forty-three different AM fungal sequence types were found which clustered in 16 phylotypes: 14 belonged to the Glomeraceae and two to the Diversisporaceae. Surprisingly, only two of these phylotypes were related with sequences of morphologically defined species: Glomus intraradices and Glomus constrictum. Significant differences were detected for the relative abundance of some phylotypes while no effects were found for the calculated diversity indices. These results may help to design efficient mycorrhizal-based revegetation programs for this type of ecosystems.
机译:与地中海生态系统的某些区域相比,丛枝菌根(AM)共生在改善植物适应性和土壤质量(尤其是在脆弱和紧张的环境中)方面发挥着重要作用。 AM真菌群落通常受动态因素的影响,例如植物群落的结构和组成,而这些因素又受季节的影响。因此,通过在西班牙东南部典型的地中海生态系统中对两种代表性灌木丛物种(迷迭香和百里香合子)的根系进行采样,进行了为期一年的时程试验。对根部AM真菌群落的18S rDNA基因进行了PCR-SSCP,测序和系统发育分析。发现了43种不同的AM真菌序列类型,它们聚集在16种系统型中:14种属于Glomeraceae,另外2种属于Diversisporaceae。令人惊讶的是,这些系统型中只有两个与形态定义物种的序列有关:Glomus intraradices和Glomus constrictum。对于某些系统型的相对丰度,检测到显着差异,而对计算出的多样性指数没有影响。这些结果可能有助于针对此类生态系统设计有效的基于菌根的再植被计划。

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