Microbial phylotype composition and diversity predicts plant productivity and plant-soil feedbacks.

Microbial phylotype composition and diversity predicts plant productivity and plant-soil feedbacks.
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DOI:
10.1111/ele.12024
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发表时间:
2013-02
期刊:
影响因子:
8.8
通讯作者:
Thrall PH
Thrall PH
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Bever JD;Broadhurst LM;Thrall PH

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生态变异与微生物遗传组成之间的关系对于理解微生物对群落和生态系统功能的影响至关重要。在使用9种本地豆科植物和40种根瘤菌菌株的温室试验中,我们发现细菌rRNA种型占共生有效性的68%的分离间变异性和生长反应的79%的宿主特异性。我们还发现,从地理范围广泛的地点收集的土壤根瘤菌的种类多样性和组成解释了两种金合欢物种的生长响应。两种金合欢寄主之间的土壤微生物正反馈主要是由根瘤菌多样性的变化驱动的。较弱的寄主水杨金合欢(Acacia salicina)积累了较大的根瘤菌多样性,并对较强的狭叶金合欢的生长产生了负面影响。本研究证明了植物种型与微生物功能的对应关系,并证明了根瘤菌对寄主物种的动态影响可以反馈给植物种群性能。
The relationship between ecological variation and microbial genetic composition is critical to understanding microbial influence on community and ecosystem function. In glasshouse trials using nine native legume species and forty rhizobial strains, we find that bacterial rRNA phylotype accounts for 68% of inter-isolate variability in symbiotic effectiveness and 79% of host-specificity in growth response. We also find that rhizobial phylotype diversity and composition of soils collected from a geographic breadth of sites explains the growth responses of two acacia species. Positive soil microbial feedback between the two acacia hosts was largely driven by changes in diversity of rhizobia. Greater rhizobial diversity accumulated in association with the less responsive host species, Acacia salicina, and negatively affected the growth of the more responsive A. stenophylla. Together this work demonstrates correspondence of phylotype with microbial function, and demonstrates that the dynamics of rhizobia on host-species can feed back on plant population performance.
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