Duell Eric B, Bever James D, Wilson Gail W T
Kansas Biological Survey & Center for Ecological Research Lawrence Kansas USA.
Department of Ecology & Evolutionary Biology University of Kansas Lawrence Kansas USA.
Ecol Evol. 2023 Jan 24;13(1):e9763. doi: 10.1002/ece3.9763. eCollection 2023 Jan.
Plants affect associated biotic and abiotic edaphic factors, with reciprocal feedbacks from soil characteristics affecting plants. These two-way interactions between plants and soils are collectively known as plant-soil feedbacks (PSFs). The role of phylogenetic relatedness and evolutionary histories have recently emerged as a potential driver of PSFs, although the strength and direction of feedbacks among sympatric congeners are not well-understood. We examined plant-soil feedback responses of , a common clonal milkweed species, with several sympatric congeners across a gradient of increasing phylogenetic distances (, , , and , respectively). Plant-soil feedbacks were measured through productivity and colonization by arbuscular mycorrhizal (AM) fungi. produced less biomass in soils conditioned by the most phylogenetically distant species (), relative to conspecific-conditioned soils. Similarly, arbuscular mycorrhizal (AM) fungal colonization of roots was reduced when grown in soils conditioned by , compared with colonization in plants grown in soil conditioned by any of the other three species, indicating mycorrhizal associations are a potential mechanism of observed positive PSFs. This display of differences between the most phylogenetically distant, but not close or intermediate, paring(s) suggests a potential phylogenetic threshold, although other exogenous factors cannot be ruled out. Overall, these results highlight the potential role of phylogenetic distance in influencing positive PSFs through mutualists. The role of phylogenetic relatedness and evolutionary histories have recently emerged as a potential driver of plant-soil feedbacks (PSFs), although the strength and direction of feedbacks among sympatric congeners are not well-understood. Congeneric, sympatric milkweeds typically generated positive PSFs in terms of productivity and AM fungal colonization, suggesting the low likelihood of coexistence among tested pairs, with a strength of feedback increasing as the phylogenetic distance increases.
植物会影响与之相关的生物和非生物土壤因子，而土壤特性对植物的反向反馈也会产生影响。植物与土壤之间的这种双向相互作用被统称为植物-土壤反馈（PSFs）。系统发育相关性和进化历史的作用最近已成为植物-土壤反馈的一个潜在驱动因素，尽管同域同属物种之间反馈的强度和方向尚未得到充分理解。我们研究了一种常见的克隆马利筋属植物与几种同域同属植物在系统发育距离不断增加的梯度下（分别为 、 、 和 ）的植物-土壤反馈响应。通过丛枝菌根（AM）真菌的生产力和定殖来测量植物-土壤反馈。与同种植物处理过的土壤相比，在系统发育距离最远的物种（ ）处理过的土壤中， 产生的生物量更少。同样，与在其他三种 物种处理过的土壤中生长的植物相比，在 处理过的土壤中生长时， 根的丛枝菌根（AM）真菌定殖减少，这表明菌根共生关系是观察到的正向植物-土壤反馈的一种潜在机制。这种在系统发育距离最远而非相近或中间配对之间表现出的差异表明存在一个潜在的系统发育阈值，尽管不能排除其他外部因素。总体而言，这些结果突出了系统发育距离在通过共生体影响正向植物-土壤反馈方面的潜在作用。系统发育相关性和进化历史的作用最近已成为植物-土壤反馈（PSFs）的一个潜在驱动因素，尽管同域同属物种之间反馈的强度和方向尚未得到充分理解。同域同属的马利筋属植物通常在生产力和 AM 真菌定殖方面产生正向植物-土壤反馈，这表明测试配对之间共存的可能性较低，随着系统发育距离的增加，反馈强度也会增加。
