Universidade Federal de São João del-Rei, R. Padre João Pimentel, 80, Dom Bosco, São João del-Rei, Minas Gerais, 36301-158, Brazil.
Empresa Brasileira de Pesquisa Agropecuária, Embrapa Milho e Sorgo, Rod. MG 424 KM 65, Sete Lagoas, Minas Gerais, 35701-970, Brazil.
Mycorrhiza. 2021 Mar;31(2):259-264. doi: 10.1007/s00572-020-01006-1. Epub 2020 Nov 16.
The association between arbuscular mycorrhizal fungi (AMF) and sorghum, the fifth most cultivated cereal in the world and a staple food for many countries, is relevant to improving phosphorus (P) absorption. The importance of root exudation as a signal for the symbiosis has been shown for several species, but a complete understanding of the signaling molecules involved in the mycorrhizal symbiosis signaling pathway has not yet been elucidated. In this context, we investigated the effect of sorgoleone, one of the most studied allelochemicals and a predominant compound of root exudates in sorghum, on AMF colonization and consequently P uptake and plant growth on a sorghum genotype. The sorghum genotype P9401 presents low endogenous sorgoleone content, and when it was inoculated with Rhizophagus clarus together with 5 and 10 µM sorgoleone, mycorrhizal colonization was enhanced. A significant enhancement of mycorrhizal colonization and an increase of P content and biomass were observed when R. clarus was inoculated together with 20 µM sorgoleone. Thus, our results indicate that sorgoleone influences mycorrhizal colonization, but the mechanisms by which it does so still need to be revealed.
丛枝菌根真菌 (AMF) 与高粱的关系，高粱是世界上第五大栽培谷物，也是许多国家的主食，与提高磷 (P) 吸收有关。已经证明，根分泌物作为共生信号对于几种物种很重要，但对于参与菌根共生信号通路的信号分子还没有完全了解。在这种情况下，我们研究了 sorgoleone（一种研究最多的化感物质，也是高粱根分泌物中的主要化合物之一）对 AMF 定殖的影响，以及它对 P 吸收和植物生长的影响在高粱基因型上。高粱基因型 P9401 具有低内源 sorgoleone 含量，当它与 Rhizophagus clarus 一起接种并添加 5 和 10 μM sorgoleone 时，菌根定殖得到增强。当与 20 μM sorgoleone 一起接种 R. clarus 时，观察到菌根定殖的显著增强以及 P 含量和生物量的增加。因此，我们的结果表明，sorgoleone 影响菌根定殖，但它的作用机制仍有待揭示。
