Comparative analysis of arbuscular mycorrhizal roots of Lotus japonicus, Daucus carota, and Eustoma grandiflorum. angiosperm mycorrhizal host

Most of terrestrial plants associate with symbiotic fungi, arbuscular mycorrhizal (AM) fungi. In nature, the morphotypes of AM fungal hyphae in AM roots are diverse among the host species; Arum-, Paris-, and Intermediate AMs. Since Arum-type AM are often observed in many crops and model plants, AM-host plants forming this AM morphotype has been used in several studies. Recently, gibberellin (GA) has been reported its negative effects on Arum-type AM symbiosis in Lotus japonicus; however, we previously showed its positive effects on Paris-type AM symbiosis in Eustoma grandiflorum. Here, we conducted comparative transcriptomics to clarify molecular mechanisms causing the different outcomes of GA including Intermediate-type AM symbiosis in Daucus carota. In this study, we used L. japonicus, D. carota, and E. grandiflorum associating with Rhizophagus irregularis in the absence or presence of exogenous GA. This comparative analysis revealed similar and different responses to AM fungal colonization and GA among AM-host plants showing distinct morphotypes. In addition, our study would shed light on diverse transcriptional regulation in AM symbiosis among host plants.