Selectivity by host plants affects the distribution of arbuscular mycorrhizal fungi: evidence from ITS rDNA sequence metadata.
Selectivity by host plants affects the distribution of arbuscular mycorrhizal fungi: evidence from ITS rDNA sequence metadata.
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寄主植物的选择性影响丛枝菌根真菌的分布：来自 ITS rDNA 序列元数据的证据。
DOI：
10.1186/1471-2148-12-50
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发表时间：
2012-04-12
影响因子：
3.4
通讯作者：
Chen X
中科院分区：
文献类型：
--
作者：
Yang H;Zang Y;Yuan Y;Tang J;Chen X
丛枝菌根真菌（AMF）能与绝大多数陆生植物形成专性共生，其分布格局日益受到研究者的关注。在当地范围内，AMF的分布有很好的记录。然而，大规模的研究是有限的，因为密集的采样是困难的。在这里，我们使用从公共数据库获得的ITS rDNA序列元数据来研究AMF在大陆和全球范围内的分布。我们还利用这些序列元数据研究了宿主植物是否是影响AMF大规模分布的主要因素。我们定义了305 ITS虚拟类群（ITS-VT）的所有序列的球囊菌门通过使用一个全面的最大似然系统发育分析。每个寄主分类目的特异性ITS-VT平均约为53%，约60%的ITS-VT是寄主特异性的。寄主范围广的ITS-VT具有广泛的地理分布。大多数ITS-VT只发生在一种类型的主机功能组。大多数ITS-VT的分布是有限的跨生态系统，跨大陆，跨地理区域，跨气候带。非度量多维尺度分析（NMDS）表明，AMF群落组成在宿主功能群之间、生态系统、大陆、生物地理区和气候带之间存在差异。Mantel检验表明，AMF群落组成与植物群落组成在生态系统间、大陆间、地理区间和气候带间均存在显著相关性。结构方程模型（SEM）分析表明，生态系统、大陆、地理区域和气候带对AMF分布的影响主要是间接的，而植物对AMF的影响主要是直接的。AMF的ITS rDNA序列分析表明，AMF在大尺度上的分布具有高度的特有性。这表明AMF在不同尺度（植物分类顺序和功能群）上对寄主具有高度的专一性，对寄主植物具有高度的选择性。生态系统、地理、大陆和气候等因子对AMF分布的影响可能是由寄主植物介导的。
Arbuscular mycorrhizal fungi (AMF) can form obligate symbioses with the vast majority of land plants, and AMF distribution patterns have received increasing attention from researchers. At the local scale, the distribution of AMF is well documented. Studies at large scales, however, are limited because intensive sampling is difficult. Here, we used ITS rDNA sequence metadata obtained from public databases to study the distribution of AMF at continental and global scales. We also used these sequence metadata to investigate whether host plant is the main factor that affects the distribution of AMF at large scales. We defined 305 ITS virtual taxa (ITS-VTs) among all sequences of the Glomeromycota by using a comprehensive maximum likelihood phylogenetic analysis. Each host taxonomic order averaged about 53% specific ITS-VTs, and approximately 60% of the ITS-VTs were host specific. Those ITS-VTs with wide host range showed wide geographic distribution. Most ITS-VTs occurred in only one type of host functional group. The distributions of most ITS-VTs were limited across ecosystem, across continent, across biogeographical realm, and across climatic zone. Non-metric multidimensional scaling analysis (NMDS) showed that AMF community composition differed among functional groups of hosts, and among ecosystem, continent, biogeographical realm, and climatic zone. The Mantel test showed that AMF community composition was significantly correlated with plant community composition among ecosystem, among continent, among biogeographical realm, and among climatic zone. The structural equation modeling (SEM) showed that the effects of ecosystem, continent, biogeographical realm, and climatic zone were mainly indirect on AMF distribution, but plant had strongly direct effects on AMF. The distribution of AMF as indicated by ITS rDNA sequences showed a pattern of high endemism at large scales. This pattern indicates high specificity of AMF for host at different scales (plant taxonomic order and functional group) and high selectivity from host plants for AMF. The effects of ecosystemic, biogeographical, continental and climatic factors on AMF distribution might be mediated by host plants.
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影响因子：
56.9
作者：
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通讯作者：
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