Microbe-induced plant resistance alters aphid inter-genotypic competition leading to rapid evolution with consequences for plant growth and aphid abundance

IF 3.1 2区 环境科学与生态学 Q2 ECOLOGY Oikos Pub Date : 2024-02-12 DOI:10.1111/oik.10426
Xinqiang Xi, Andrew Dean, Sharon E. Zytynska
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Abstract

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 on a shared host plant. We tested the role of a plant-beneficial soil bacterium Acidovorax radicis in altering eco-evolutionary interactions between different aphid genotypes (Sitobion avenae, genotypes Sickte and Fescue) feeding on barley Hordeum vulgare. We measured fecundity, longevity and population growth of two aphid genotypes reared separately or together (population mixture) on three different barley varieties that were inoculated with or without A. radicis. Results showed that across all plant varieties A. radicis increased plant growth and suppressed aphid populations via reduced longevity and fecundity. The strength of effect was dependent on aphid genotype and barley variety, while the direction of effect was altered by aphid population mixture. Using Lotka–Volterra modelling, we demonstrated that while A. radicis inoculation decreased growth rates for both aphid genotypes it increased the competitiveness of one genotype against the other. In general, in the presence of A. radicis, the Fescue aphid genotype became more inhibitory of Sickte aphids, while Sickte aphids facilitated the growth of Fescue aphids. Our work demonstrates that plant rhizosphere microbiomes exert community-level influences by mediating eco-evolutionary interactions between herbivores and host plants. By altering competitive interaction outcomes among aphids and thus impacting processes such as rapid evolution, soil microbes contribute to the short- and long-term structure and functioning of terrestrial habitats.
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微生物诱导的植物抗性改变了蚜虫基因型间的竞争,导致快速进化,对植物生长和蚜虫数量造成影响
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互动的影响已被反复证明,但土壤微生物组是否(以及如何)能在共同宿主植物上介导这些生态进化过程,目前还不得而知。我们测试了对植物有益的土壤细菌 Acidovorax radicis 在改变以大麦为食的不同蚜虫基因型(Sitobion avenae,基因型 Sickte 和 Fescue)之间的生态进化相互作用中的作用。我们测量了两种蚜虫基因型分别或共同饲养(种群混合)在三种不同大麦品种上的繁殖力、寿命和种群增长情况,这些大麦品种接种或不接种蚜虫。结果表明,在所有植物品种上,A. radicis 都能增加植物生长,并通过降低寿命和繁殖力来抑制蚜虫数量。影响的强度取决于蚜虫基因型和大麦品种,而影响的方向则受蚜虫种群混合物的影响。我们利用 Lotka-Volterra 模型证明,虽然接种 A. radicis 会降低两种蚜虫基因型的生长率,但却会提高一种基因型对另一种基因型的竞争力。一般来说,在根瘤蚜存在的情况下,羊茅蚜基因型对镰刀蚜的抑制作用更强,而镰刀蚜则有利于羊茅蚜的生长。我们的研究表明,植物根瘤微生物群通过介导食草动物与寄主植物之间的生态进化互动,发挥了群落级的影响。通过改变蚜虫之间的竞争互动结果,从而影响快速进化等过程,土壤微生物对陆地栖息地的短期和长期结构与功能做出了贡献。
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来源期刊
Oikos
Oikos 环境科学-生态学
CiteScore
6.20
自引率
5.90%
发文量
152
审稿时长
6-12 weeks
期刊介绍: Oikos publishes original and innovative research on all aspects of ecology, defined as organism-environment interactions at various spatiotemporal scales, so including macroecology and evolutionary ecology. Emphasis is on theoretical and empirical work aimed at generalization and synthesis across taxa, systems and ecological disciplines. Papers can contribute to new developments in ecology by reporting novel theory or critical empirical results, and "synthesis" can include developing new theory, tests of general hypotheses, or bringing together established or emerging areas of ecology. Confirming or extending the established literature, by for example showing results that are novel for a new taxon, or purely applied research, is given low priority.
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