The effects of gibberellin on the expression of symbiosis-related genes in -type arbuscular mycorrhizal symbiosis in .

Arbuscular mycorrhiza (AM) is a symbiotic interaction in terrestrial plants that is colonized by fungi in the Glomeromycotina. The morphological types of AM, including the -type and -type, are distinct, depending on the host plant species. A part of the regulatory pathways in -type AM symbiosis has been revealed because most model plants form the -type AM with a model AM fungus, . Moreover, gibberellin (GA) is known to severely inhibit AM fungal colonization in -type AM symbiosis. Recently, we showed that exogenous GA treatment significantly promoted AM fungal colonization in -type AM symbiosis in . In this study, we focused on the transcriptional changes in AM symbiosis-related genes in GA-treated . The expression levels of all examined genes were maintained or increased by GA treatment compared with those of the control treatment. Our new results suggest that signaling pathway(s) required for establishing AM symbiosis in may be distinct from the well-characterized pathway for that in model plants.