Bowen Jennifer L, Kearns Patrick J, Byrnes Jarrett E K, Wigginton Sara, Allen Warwick J, Greenwood Michael, Tran Khang, Yu Jennifer, Cronin James T, Meyerson Laura A
Department of Marine and Environmental Sciences, Marine Science Center, Northeastern University, 430 Nahant Road, Nahant, MA, 01908, USA.
University of Massachusetts Boston, 100 Morrissey Boulevard, Boston, MA, 02125, USA.
Nat Commun. 2017 Sep 5;8(1):433. doi: 10.1038/s41467-017-00626-0.
Plant-microbe interactions play crucial roles in species invasions but are rarely investigated at the intraspecific level. Here, we study these interactions in three lineages of a globally distributed plant, Phragmites australis. We use field surveys and a common garden experiment to analyze bacterial communities in the rhizosphere of P. australis stands from native, introduced, and Gulf lineages to determine lineage-specific controls on rhizosphere bacteria. We show that within-lineage bacterial communities are similar, but are distinct among lineages, which is consistent with our results in a complementary common garden experiment. Introduced P. australis rhizosphere bacterial communities have lower abundances of pathways involved in antimicrobial biosynthesis and degradation, suggesting a lower exposure to enemy attack than native and Gulf lineages. However, lineage and not rhizosphere bacterial communities dictate individual plant growth in the common garden experiment. We conclude that lineage is crucial for determination of both rhizosphere bacterial communities and plant fitness.Environmental factors often outweigh host heritable factors in structuring host-associated microbiomes. Here, Bowen et al. show that host lineage is crucial for determination of rhizosphere bacterial communities in Phragmites australis, a globally distributed invasive plant.
植物与微生物的相互作用在物种入侵中起着关键作用，但在种内水平上很少被研究。在这里，我们研究了全球分布的植物芦苇（Phragmites australis）三个谱系中的这些相互作用。我们通过实地调查和一个共同花园实验来分析来自原生、引入和海湾谱系的芦苇群落根际的细菌群落，以确定对根际细菌的谱系特异性控制。我们表明，谱系内的细菌群落相似，但谱系间不同，这与我们在一个互补的共同花园实验中的结果一致。引入的芦苇根际细菌群落中参与抗菌生物合成和降解的途径丰度较低，这表明与原生和海湾谱系相比，其遭受敌人攻击的暴露程度较低。然而，在共同花园实验中，决定个体植物生长的是谱系而非根际细菌群落。我们得出结论，谱系对于确定根际细菌群落和植物适应性都至关重要。在构建宿主相关微生物群时，环境因素往往比宿主遗传因素更重要。在这里，鲍文等人表明，宿主谱系对于确定全球分布的入侵植物芦苇的根际细菌群落至关重要。
