An invading annual plant benefits less from soil biota and has reduced competitive power with a resident grass
An invading annual plant benefits less from soil biota and has reduced competitive power with a resident grass
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DOI：
10.1093/jpe/rtab050
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发表时间：
2021-05-22
影响因子：
2.7
通讯作者：
Guo, Hui
中科院分区：
文献类型：
--
作者：
Luo, Xi;Larios, Loralee;Guo, Hui
目的植物与其土壤生物群之间的相互作用，特别是丛枝菌根真菌(AMF)，可能在新环境下外来植物的建立和范围扩大中发挥重要作用。然而，引进后对丛枝菌根真菌的依赖程度是否发生了变化，以及依赖关系如何与竞争相互作用仍未得到很好的了解。方法我们进行了一个普通花园温室实验，以考察植物物种车前(美国)和入侵种群(中国)对土壤生物群的反应，以及这些反应是否在竞争对手的存在下发生变化。重要发现我们发现，尽管本地种群在生物量和种子生产方面一直具有较高的丛枝菌根定殖率，并从丛枝菌根菌群的种子生产中受益，但入侵种群从丛枝菌根菌菌群中获得的好处较少，甚至在竞争对手存在的情况下表现出生物量的减少。入侵种群对菌根的这种低依赖性与本土竞争者对入侵者的更大抑制有关。入侵种群和本地种群对丛枝菌根真菌的不同反应表明，在维州疫霉入侵中国的过程中，菌根依赖性发生了变化。我们的发现表明，这种减少的依赖在物种间竞争中会产生成本。
Aims Interactions between plants and their soil biota, arbuscular mycorrhizal fungi (AMF) in particular, may play a vital role in the establishment and the range expansion of exotic plants in new environments. However, whether there are post-introduction shifts in dependence on AMF and how dependency interacts with competition remains poorly understood.Methods We conducted a common garden greenhouse experiment to examine how native (USA) and invasive (China) populations of the plant species Plantago virginica, respond to soil biota, and whether these responses change in the presence of a competitor.Important Findings We found that while native populations consistently had a higher AMF colonization rate and benefited from AMF in both biomass and seed production, invasive populations received less benefit from AMF, and even showed reduced biomass with AMF in the presence of a competitor. This low mycorrhizal dependency in invasive populations correlated with greater suppression by an indigenous competitor for the invader. The different responses of the invasive and native populations to AMF suggest that alteration of mycorrhizal dependency has occurred during the invasion of P. virginica into China. Our findings suggest that this reduced dependency incurs a cost during interspecific competition.