One of these mutualisms is not like the other: Interactions between a plant host and two soil microbial partners may have evolved independently

Legumes often interact with two types of soil microbial mutualists: arbuscular mycorrhizal (AM) fungi and rhizobia bacteria. Plants are expected to respond synergistically to these microbes, because each partner provides a different limiting nutrient (AM fungi provide phosphorus, rhizobia provide nitrogen). Using 34 geographically widespread plant populations of Medicago truncatula, Franklin et al. found that AM fungi and rhizobia did not have a synergistic effect on plant growth. Rather, plant growth response to AM fungi was an order of magnitude greater than the response to rhizobia. Furthermore, the interaction between a plant population and one microbial mutualist did not necessarily predict its interaction with the other mutualist. These findings suggest that plant responses to each microbial partner evolved independently.

Franklin, James B. et al. 2020. Population‐level variation in host plant response to multiple microbial mutualists. American Journal of Botany https://doi.org/10.1002/ajb2.1543

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这些共生关系中的一种互不相同：植物宿主与两个土壤微生物伴侣之间的相互作用可能是独立发生的

豆类经常与两种土壤微生物共生体相互作用：丛枝菌根（AM）真菌和根瘤菌。期望植物对这些微生物产生协同反应，因为每个伙伴都提供不同的限制性营养素（AM真菌提供磷，根瘤菌提供氮）。利用34种地理分布的紫花苜蓿植物种群 ，富兰克林等。发现AM真菌和根瘤菌对植物生长没有协同作用。相反，植物对AM真菌的生长反应要比对根瘤菌的反应高一个数量级。此外，植物种群与一个微生物互惠者之间的相互作用并不一定预示着它与另一微生物互惠者之间的相互作用。这些发现表明植物对每种微生物伴侣的反应独立发生。

富兰克林，詹姆斯·B。等。2020年。在宿主植物响应于多个微生物共生人口级别的变化。美国植物学杂志https://doi.org/10.1002/ajb2.1543