Microbes, mutualism, and range margins: testing the fitness consequences of soil microbial communities across and beyond a native plant's range
Microbes, mutualism, and range margins: testing the fitness consequences of soil microbial communities across and beyond a native plant's range
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DOI：
10.1111/nph.17102
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发表时间：
2020-12-18
期刊：
影响因子：
9.4
通讯作者：
Moeller, David A.
中科院分区：
文献类型：
--
作者：
Benning, John W.;Moeller, David A.
植物与土壤真菌和细菌之间的相互作用无处不在，对植物个体的适应性有很大影响。然而，土壤微生物群落的空间变化对植物物种分布的调节程度在很大程度上尚未得到测试。使用加州本土植物Clarkia xantiana ssp。 xantiana 我们将植物种群和土壤的温室和田间相互移植配对，以测试植物-微生物相互作用是否影响植物的地理范围限制以及植物和土壤微生物群落之间是否存在局部适应。在田间和温室中，两种范围内部接种物之一对植物适应性有积极影响。在现场，这种好处在范围边缘及以外尤其明显，表明可能存在共生限制。在温室中，来自范围外的土壤接种物往往会促进植物生长，这表明微生物天敌的释放超出了范围边缘。扩增子测序揭示了跨越范围边界的微生物群落的明显变化。分散到超出其范围限制的植物很可能会遇到新的微生物群落。在 C.x. xantiana，我们的结果表明，较少的病原体可能会促进范围扩大，但也可能因缺乏互利共生而受到阻碍。植物-微生物的负面和正面相互作用都可能会影响当代范围的变化。
Interactions between plants and soil fungi and bacteria are ubiquitous and have large effects on individual plant fitness. However, the degree to which spatial variation in soil microbial communities modulates plant species' distributions remains largely untested.Using the California native plant Clarkia xantiana ssp. xantiana we paired glasshouse and field reciprocal transplants of plant populations and soils to test whether plant-microbe interactions affect the plant's geographic range limit and whether there is local adaptation between plants and soil microbe communities.In the field and glasshouse, one of the two range interior inocula had a positive effect on plant fitness. In the field, this benefit was especially pronounced at the range edge and beyond, suggesting possible mutualist limitation. In the glasshouse, soil inocula from beyond-range tended to increase plant growth, suggesting microbial enemy release beyond the range margin. Amplicon sequencing revealed stark variation in microbial communities across the range boundary.Plants dispersing beyond their range limit are likely to encounter novel microbial communities. In C. x. xantiana, our results suggest that range expansion may be facilitated by fewer pathogens, but could also be hindered by a lack of mutualists. Both negative and positive plant-microbe interactions will likely affect contemporary range shifts.