Root flavonoids are related to enhanced AMF colonization of an invasive tree
Root flavonoids are related to enhanced AMF colonization of an invasive tree
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根黄酮类化合物与入侵树木的 AMF 定植增强有关
DOI：
10.1093/aobpla/plaa002
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发表时间：
2020-02-01
期刊：
影响因子：
2.9
通讯作者：
Ding, Jianqing
中科院分区：
文献类型：
--
作者：
Pei, Yingchun;Siemann, Evan;Ding, Jianqing
丛枝菌根真菌（AMF）是土壤中重要的共生微生物，能够与大多数陆地植物形成共生关系。丛枝菌根真菌在植物入侵中发挥着重要作用，其与入侵植物的相互作用越来越受到重视。然而，AMF与入侵植物相互作用的化学机制仍然知之甚少。在这项研究中，我们的目的是测试根系次生化学物质是否与AMF在入侵树木中的定植和快速生长有关。为了研究AMF定植与引种（美国）和本土（中国）植物根系次生代谢物之间的关系，我们在中国进行了一项普通的中国牛脂树（Triadica sebifera）园艺试验。我们发现，与本地种群相比，引入种群的AMF定殖率更高。引种植物的根中酚类物质和单宁含量较低，而黄酮类物质含量高于本地植物。黄酮类化合物与AMF定植呈正相关，在引种群体中这种关系尤为明显。此外，AMF定殖量与植物生物量呈正相关，表明较高的根黄酮含量和AMF定殖量可能影响植物的生产性能。这表明引种植物中较高的根黄酮类化合物可能促进AMF孢子萌发和/或吸引菌丝到根部，从而促进植物生长。总体而言，我们的研究结果支持入侵植物通过其根类黄酮代谢的遗传变化增强其AMF关联和入侵成功的情景。这些发现促进了我们对植物入侵成功的机制以及植物与AMF之间的进化相互作用的理解。了解这些入侵植物成功的机制对于预测和管理植物入侵至关重要，此外还为amf -植物相互作用的化学机制提供了重要的见解。
Arbuscular mycorrhizal fungi (AMF) are important mutualistic microbes in soil, which have capacity to form mutualistic associations with most land plants. Arbuscular mycorrhizal fungi play an important role in plant invasions and their interactions with invasive plants have received increasing attention. However, the chemical mechanisms underlying the interactions of AMF and invasive plants are still poorly understood. In this study we aim to test whether root secondary chemicals are related to enhanced AMF colonization and rapid growth in an invasive tree. We conducted a common garden experiment in China with Chinese tallow tree (Triadica sebifera) to examine the relationships among AMF colonization and secondary metabolites in roots of plants from introduced (USA) and native (China) populations. We found that AMF colonization rate was higher in introduced populations compared to native populations. Roots of plants from introduced populations had lower levels of phenolics and tannins, but higher levels of flavonoids than those of plants from native populations. Flavonoids were positively correlated with AMF colonization, and this relationship was especially strong for introduced populations. Besides, AMF colonization was positively correlated with plant biomass suggesting that higher root flavonoids and AMF colonization may impact plant performance. This suggests that higher root flavonoids in plants from introduced populations may promote AMF spore germination and/or attract hyphae to their roots, which may subsequently increase plant growth. Overall, our results support a scenario in which invasive plants enhance their AMF association and invasion success via genetic changes in their root flavonoid metabolism. These findings advance our understanding of the mechanisms underlying plant invasion success and the evolutionary interactions between plants and AMF. Understanding such mechanisms of invasive plant success is critical for predicting and managing plant invasions in addition to providing important insights into the chemical mechanism of AMF-plant interactions.