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（世界上第五大谷物）和许多国家的主食之间的联系与提高磷（P）的吸收有关。根系渗出作为共生信号的重要性已在几种物种中得到证实，但尚未阐明对菌根共生信号通路中涉及的信号分子的完整理解。在这种情况下，我们研究了高粱油酸（一种研究最多的化感药物之一，也是高粱根系分泌物的主要化合物）对AMF定植的影响，并因此对高粱基因型吸收P和植物生长。高粱基因型P9401的内源性高粱油酮含量较低，并且在接种了根瘤菌时也是如此连同5和10 µM的高粱油酮，菌根定植得到增强。当与20 µM的高粱油菜籽一起接种克拉克酵母时，观察到菌根定植显着增强，磷含量和生物量增加。因此，我们的结果表明，高粱油酮对菌根定植有影响，但其机制尚需揭示。