Department of Molecular Biology and Genetics, Aarhus University, Denmark.
Center for Genomic Sciences, National Autonomous University of Mexico. Cuernavaca, Mexico.
Mol Plant Microbe Interact. 2022 Nov;35(11):1006-1017. doi: 10.1094/MPMI-06-22-0124-R. Epub 2022 Oct 31.
Legumes acquire access to atmospheric nitrogen through nitrogen fixation by rhizobia in root nodules. Rhizobia are soil-dwelling bacteria and there is a tremendous diversity of rhizobial species in different habitats. From the legume perspective, host range is a compromise between the ability to colonize new habitats, in which the preferred symbiotic partner may be absent, and guarding against infection by suboptimal nitrogen fixers. Here, we investigate natural variation in rhizobial host range across species. We find that is considerably more promiscuous than , represented by the Gifu accession, in its interactions with rhizobia. This promiscuity allows to form nodules with , , , , and species that represent five distinct genera. Using recombinant inbred lines, we have mapped the Gifu/ promiscuity quantitative trait loci (QTL) to the same genetic locus regardless of rhizobial genus, suggesting a general genetic mechanism for symbiont-range expansion. The Gifu/ QTL now provides an opportunity for genetic and mechanistic understanding of promiscuous legume-rhizobia interactions. [Formula: see text] Copyright © 2022 The Author(s). This is an open access article distributed under the CC BY 4.0 International license.
豆科植物通过根瘤中的根瘤菌固氮作用从大气中获取氮。根瘤菌是土壤中的细菌，在不同的生境中有大量不同的根瘤菌物种。从豆科植物的角度来看，宿主范围是在能够定殖新栖息地（在这些新栖息地中，首选的共生伙伴可能不存在）和防止被次优固氮生物感染之间的一种妥协。在这里，我们研究了不同物种的根瘤菌宿主范围的自然变异。我们发现，Gifu 品系代表的 比 更混杂，在与根瘤菌的相互作用中表现出更强的混杂性。这种混杂性使 能够与 、 、 、 和 五个不同属的物种形成根瘤。利用重组近交系，我们已经将 Gifu/混杂性数量性状位点 (QTL) 映射到相同的遗传位点，无论根瘤菌属如何，这表明了一种用于扩大共生体范围的一般遗传机制。Gifu/现在为理解混杂的豆科植物-根瘤菌相互作用提供了遗传和机制理解的机会。 [Formula: see text] 版权所有 © 2022 作者。这是一个在 CC BY 4.0 国际许可下发布的开放获取文章。
