Ethylene promotes SMAX1 accumulation to inhibit arbuscular mycorrhiza symbiosis.

ABSTRACT: Most land plants engage in arbuscular mycorrhiza (AM) symbiosis with Glomeromycotina fungi for better access to mineral nutrients. The plant hormone ethylene suppresses AM development, but a molecular explanation for this phenomenon is lacking. Here we show that ethylene inhibits the expression of many genes required for AM formation in Lotus japonicus. These genes include strigolactone biosynthesis genes, which are needed for fungal activation, and Common Symbiosis genes, which are required for fungal entry into the root. Application of strigolactone analogs and ectopic expression of the Common Symbiosis gene Calcium Calmodulin-dependent Kinase (CCaMK) counteracts the effect of ethylene. Therefore, ethylene likely inhibits AM development by suppressing expression of these genes rather tha

SUBMITTER: Das D 

PROVIDER: S-EPMC11868565 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature