Distinct seasonal assemblages of arbuscular mycorrhizal fungi revealed by massively parallel pyrosequencing
Distinct seasonal assemblages of arbuscular mycorrhizal fungi revealed by massively parallel pyrosequencing
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DOI：
10.1111/j.1469-8137.2010.03636.x
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发表时间：
2011-01-01
期刊：
影响因子：
9.4
通讯作者：
Helgason, Thorunn
中科院分区：
文献类型：
--
作者：
Dumbrell, Alex J.;Ashton, Peter D.;Helgason, Thorunn
了解根际微生物群落动态对预测未来生态系统功能至关重要，但大多数研究都集中在空间或时间过程，忽略了时空组合效应。我们采样AM真菌从植物根系生长在温带草原在空间上明确的方式在整个year.Ordinance分析的AM真菌组合揭示了显着的组成和结构的时间变化。α和β多样性与气候变量温度和日照时数呈负相关。较高的α多样性在寒冷的时期可能反映了AM真菌物种之间的竞争性相互作用有限的碳供应量下，β多样性分析，突出了如何资源限制可能会改变本地化的空间dynamics.Results支持的结论揭示了不同的AM真菌组合在冬季和夏季在这个草原网站。季节性变化的宿主植物碳供应，反映温度和日照时数的变化，可能是调节AM真菌群落时间动态的驱动力。因此，气候变化对季节性温度的影响可能会大大改变未来AM真菌群落动态和生态系统功能。
P>Understanding the dynamics of rhizosphere microbial communities is essential for predicting future ecosystem function, yet most research focuses on either spatial or temporal processes, ignoring combined spatio-temporal effects.Using pyrosequencing, we examined the spatio-temporal dynamics of a functionally important community of rhizosphere microbes, the arbuscular mycorrhizal (AM) fungi. We sampled AM fungi from plant roots growing in a temperate grassland in a spatially explicit manner throughout a year.Ordination analysis of the AM fungal assemblages revealed significant temporal changes in composition and structure. Alpha and beta diversity tended to be negatively correlated with the climate variables temperature and sunshine hours. Higher alpha diversity during colder periods probably reflects more even competitive interactions among AM fungal species under limited carbon availability, a conclusion supported by analysis of beta diversity which highlights how resource limitation may change localized spatial dynamics.Results reveal distinct AM fungal assemblages in winter and summer at this grassland site. A seasonally changing supply of host-plant carbon, reflecting changes in temperature and sunshine hours, may be the driving force in regulating the temporal dynamics of AM fungal communities. Climate change effects on seasonal temperatures may therefore substantially alter future AM fungal community dynamics and ecosystem functioning.