Partner diversity and identity impacts on plant productivity in Acacia-rhizobial interactions
Partner diversity and identity impacts on plant productivity in Acacia-rhizobial interactions
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DOI：
10.1111/1365-2745.12336
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发表时间：
2015-01-01
影响因子：
5.5
通讯作者：
Thrall, Peter H.
中科院分区：
文献类型：
--
作者：
Barrett, Luke G.;Bever, James D.;Thrall, Peter H.
1.在固氮根瘤菌群落中，重要功能性状的遗传变异是普遍存在的，虽然一些研究已经描述了多样性对植物相关微生物群落功能的显著影响，但我们缺乏系统的测试根瘤菌多样性如何影响植物生产力.根瘤菌和植物之间潜在的相互作用的复杂性复杂的发展一般预测根瘤菌多样性和植物生产力之间的因果关系。例如，根瘤菌的互补性可能导致共生体多样性与植物生产力之间的正相关，而拮抗性竞争可能降低根瘤菌群落功能.使用两种广泛分布的澳大利亚本土金合欢物种（A。salicina、柳生草A. stenophylla）和来自16种与这些宿主天然相关的细菌基因型的实验根瘤菌群落，我们研究了互惠互利的提供如何随根瘤菌的身份、多样性和系统发育相关性而变化.与根瘤菌基因型丰富度相关的植物性能分析表明，与单一根瘤菌基因型的生长相比，根际多个根瘤菌基因型的存在与植物生产力的普遍下降相关。重要的是，这些结果似乎是强大的主机身份和主机多样性（即一个或两个物种的混合物）的变化面前。我们还发现，无论是在单菌株还是多菌株接种中，根瘤菌基因型身份和宿主物种都显着影响金合欢-根瘤菌相互作用中的植物生产力。5.合成.总之，我们的数据表明，多个根瘤菌与一个单一的宿主物种相互作用，创造了机会，紧急或更高阶的影响，超出了那些可以简单地预测的基础上成对相互作用的结果，增加互利的多样性并不一定转化为对植物生长的积极影响。
1. Genetic variation for functionally important traits is ubiquitous in communities of nitrogen-fixing rhizobia, and while some studies have described significant effects of diversity on the functioning of plant-associated microbial communities, we lack a systematic test of how rhizobial diversity influences plant productivity.2. The complexity of potential interactions among rhizobia and plants complicates the development of general predictions regarding causal relationships between rhizobial diversity and plant productivity. For example, while rhizobial complementarity may result in positive associations between symbiont diversity and plant productivity, antagonistic competition may reduce rhizobial community function.3. Using two widespread native Australian Acacia species (A. salicina, A. stenophylla) and experimental rhizobial communities derived from 16 bacterial genotypes naturally associated with these hosts, we examined how the provision of mutualistic benefit varies with rhizobial identity, diversity and phylogenetic relatedness.4. Analysis of plant performance in relation to rhizobial genotypic richness revealed that the presence of multiple rhizobial genotypes in the rhizosphere was associated with a general decrease in plant productivity compared to growth with single rhizobial genotypes. Importantly, these results appear to be robust in the face of variation in host identity and host diversity (i.e. one or two species mixtures). We also found that rhizobial genotypic identity and host species significantly influenced plant productivity in Acacia-rhizobia interactions, both in single-and multistrain inoculations.5. Synthesis. Together, our data show that multiple rhizobia interacting with a single host species creates opportunities for emergent or higher-order effects that extend beyond those that could be simply predicted based upon outcomes of pairwise interactions and that increased mutualist diversity does not necessarily translate into positive effects on plant growth.