Departamento de Biotecnología y Bioquímica, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Irapuato, Mexico.
Laboratorio Nacional de Genómica para la Biodiversidad/Unidad de Genómica Avanzada, Centro de Investigación y de Estudios Avanzados, Instituto Politécnico Nacional (CINVESTAV-IPN), Irapuato, Mexico.
Elife. 2020 Nov 19;9:e61701. doi: 10.7554/eLife.61701.
Arbuscular mycorrhizal fungi (AMF) are ubiquitous in cultivated soils, forming symbiotic relationships with the roots of major crop species. Studies in controlled conditions have demonstrated the potential of AMF to enhance the growth of host plants. However, it is difficult to estimate the actual benefit in the field, not least because of the lack of suitable AMF-free controls. Here we implement a novel strategy using the selective incorporation of AMF-resistance into a genetic mapping population to evaluate maize response to AMF. We found AMF to account for about one-third of the grain production in a medium input field, as well as to affect the relative performance of different plant genotypes. Characterization of the genetic architecture of the host response indicated a trade-off between mycorrhizal dependence and benefit. We identified several QTL linked to host benefit, supporting the feasibility of breeding crops to maximize profit from symbiosis with AMF.
丛枝菌根真菌（AMF）在栽培土壤中无处不在，与主要作物的根系形成共生关系。在控制条件下的研究表明，AMF 有可能促进宿主植物的生长。然而，在田间很难估计实际的效益，这主要是因为缺乏合适的 AMF 无菌对照。在这里，我们采用一种新策略，利用 AMF 抗性的选择性整合到遗传图谱群体中，来评估玉米对 AMF 的反应。我们发现，在中等投入的田间条件下，AMF 约占粮食产量的三分之一，同时还影响不同植物基因型的相对表现。宿主反应的遗传结构特征表明，存在着对菌根的依赖和效益之间的权衡。我们鉴定了与宿主效益相关的几个 QTL，这支持了通过培育作物来最大限度地从与 AMF 的共生中获利的可行性。
