Soil microbe-induced plant resistance alters aphid inter-genotypic competition leading to rapid evolution with consequences for plant growth and aphid abundance
Soil microbe-induced plant resistance alters aphid inter-genotypic competition leading to rapid evolution with consequences for plant growth and aphid abundance
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土壤微生物诱导的植物抗性改变了蚜虫的基因型间竞争，导致快速进化，从而影响植物生长和蚜虫丰度
DOI：
10.1101/2022.05.05.490657
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Xi X
中科院分区：
文献类型：
--
作者：
Xi X
植物和昆虫食草动物是世界上最多样化的两个多细胞群体，两者都受到与地下土壤微生物群相互作用的强烈影响。相互快速进化对食草动物和植物之间生态相互作用的影响已被反复证明，但尚不清楚土壤微生物组是否（以及如何）能够介导这些生态进化过程。我们测试了一种对植物有益的土壤细菌（Acidovorax radicis）在改变以大麦（Hordeum）为食的以汁液为食的食草蚜虫（Sitobion avenae）之间的生态进化相互作用中的作用粗俗）。我们在接种或不接种 A 的三个大麦品种上单独或一起饲养两种蚜虫基因型。根细菌。在第一个实验中，我们在蚜虫生长7、14和21天后计数了蚜虫数量和植物生物量，而在第二个实验中，我们每1-2天计数并移走后代，以评估蚜虫的寿命和繁殖力。根茎增加了植物生长并抑制了两种基因型的蚜虫。效果的强度取决于蚜虫基因型和大麦品种，而效果的方向则因蚜虫种群混合物而改变。当羊茅蚜虫与 Sickte 蚜虫共用接种过的植物时，它们的生长速度会加快；在没有A的对照植物中没有观察到这种增加。根茎仅在蚜虫种群生长 14 天后才明显。用 A 进行植物接种。根减少了蚜虫的存活率（繁殖天数减少）和繁殖力（存活蚜虫的每日繁殖产量减少）。在第二个实验中，当控制密度时，羊茅蚜虫在混合种群中的繁殖并未增加，表明这是一种密度依赖性效应。使用 Lotka-Volterra 模型，我们证明了 A.根基接种降低了蚜虫种群的稳定性，因为它增加了基因型间的竞争，但减少了基因型内的竞争（可能是通过降低种群密度）。我们的工作证明了植物相关微生物组在介导食草动物和寄主植物之间的生态进化相互作用方面可以发挥重要作用。
Plants and insect herbivores are two of the most diverse multicellular groups in the world, and both are strongly influenced by interactions with the belowground soil microbiome. Effects of reciprocal rapid evolution on ecological interactions between herbivores and plants have been repeatedly demonstrated, but it is unknown if (and how) the soil microbiome could mediate these eco-evolutionary processes.We tested the role of a plant-beneficial soil bacterium (Acidovorax radicis) in altering eco-evolutionary interactions between sap-feeding aphid herbivores (Sitobion avenae) feeding on barley (Hordeum vulgare). We reared two aphid genotypes separately or together on three barley varieties that were inoculated with or withoutA. radicisbacteria. In the first experiment we counted the aphid number and plant biomass after 7, 14 and 21 days of aphid growth, while in a second experiment we counted and removed offspring every 1-2 days to assess aphid longevity and fecundity.Results showed thatA. radicisincreased plant growth and suppressed aphids of both genotypes. The strength of effect was dependent on aphid genotype and barley variety, while the direction of effect was altered by aphid population mixture. Fescue aphids experienced increased growth when they were sharing the plant with Sickte aphids on inoculated plants; this increase was not seen in the control plants withoutA. radicisand was only apparent after 14 days of aphid population growth.Plant inoculation withA. radicisreduced aphid survival (reduced number of reproductive days) and fecundity (reduced daily reproductive output for surviving aphids). In the second experiment, when density was controlled, Fescue aphids did not experience increased reproduction in mixed populations, suggesting this is a density-dependent effect. Using Lotka-Volterra modelling, we demonstrated thatA. radicisinoculation decreased aphid population stability as it increased inter-genotype competition but decreased the intra-genotype competition (likely through reduced population density).Our work demonstrates the important role that plant-associated microbiomes can have in mediating eco-evolutionary interactions between herbivores and host plants.
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