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首页> 美国卫生研究院文献>other >Different Distribution Patterns between Putative Ercoid Mycorrhizal and Other Fungal Assemblages in Roots of Rhododendron decorum in the Southwest of China
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Different Distribution Patterns between Putative Ercoid Mycorrhizal and Other Fungal Assemblages in Roots of Rhododendron decorum in the Southwest of China

机译：推定Ercoid菌根及其他真菌体组合之间不同的分布特点大白杜鹃的根在中国的西南地区

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Fungal diversity within plant roots is affected by several factors such as dispersal limitation, habitat filtering, and plant host preference. Given the differences in life style between symbiotic and non-symbiotic fungi, the main factors affecting these two groups of fungi may be different. We assessed the diversity of root associated fungi of Rhododendron decorum using internal transcribed spacer (>ITS) sequencing and terminal restriction fragment length polymorphism (>T-RFLP) analysis, and our aim was to evaluate the role of different factors in structuring ericoid mycorrhizal (>ERM) and non-ericoid mycorrhizal (>NEM) fungal communities. Thirty-five fungal operational taxonomic units (>OTUs) were found in roots of R. decorum, of which 25 were putative ERM fungal species. Of the two main groups of known ERM, helotialean fungi were more abundant and common than sebacinalean species. Geographic and host patterning of the fungal assemblages were different for ERM and NEM. The distribution of putative ERM fungal terminal restriction fragments (TRFs) showed that there were more common species within ERM than in the NEM fungal assemblages. Results of Mantel tests indicated that the composition of NEM fungal assemblages correlated with geographic parameters while ERM fungal assemblages lacked a significant geographic pattern and instead were correlated with host genotype. Redundancy analysis (>RDA) showed that the NEM fungal assemblages were significantly correlated with latitude, longitude, elevation, mean annual precipitation (MAP), and axis 2 of a host-genetic principle component analysis (PCA), while ERM fungal assemblages correlated only with latitude and axis 1 of the host-genetic PCA. We conclude that ERM and NEM assemblages are affected by different factors, with the host genetic composition more important for ERM and geographic factors more important for NEM assemblages. Our results contribute to understanding the roles of dispersal limitation, abiotic factors and biotic interactions in structuring fungal communities in plant roots.
机译：植物根部内的真菌多样性受多种因素影响，例如扩散限制，生境过滤和植物寄主偏好。考虑到共生真菌和非共生真菌在生活方式上的差异，影响这两类真菌的主要因素可能有所不同。我们使用内部转录间隔区（> ITS ）测序和末端限制性片段长度多态性（> T-RFLP ）分析评估了杜鹃花根相关真菌的多样性，我们的目标是评估不同因素在构建类胡萝卜素菌根（> ERM ）和非类固醇菌根（> NEM ）真菌群落中的作用。在礼木的根中发现了35个真菌操作分类单位（> OTU s），其中25个是假定的ERM真菌种类。在已知的ERM的两个主要类别中，黑硫菌真菌比癸二芥子物种更为丰富和常见。对于ERM和NEM，真菌组合的地理和寄主模式是不同的。假定的ERM真菌末端限制片段（TRF）的分布表明，与NEM真菌组合相比，ERM中存在更多的常见物种。 Mantel测试的结果表明，NEM真菌组合的组成与地理参数相关，而ERM真菌组合缺乏明显的地理模式，而与宿主基因型相关。冗余分析（> RDA ）表明，NEM真菌组合与宿主遗传主成分分析（PCA）的纬度，经度，海拔，年平均降水量（MAP）和第2轴显着相关，而ERM真菌组合仅与宿主遗传PCA的纬度和轴1相关。我们得出的结论是，ERM和NEM组合受不同因素的影响，宿主遗传组成对ERM更重要，而地理因素对NEM组合更重要。我们的结果有助于理解弥散限制，非生物因子和生物相互作用在构建植物根部真菌群落中的作用。

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