Phytohormone signaling in arbuscular mycorhiza development

- Distinct structural needs for strigolactone perception by plants and AM fungi.
- DELLA proteins are required for intraradical colonization and arbuscule formation.
- Expression of DELLA in the vasculature is sufficient to promote arbuscule formation in the cortex.
- DELLAs act genetically downstream of CYCLOPS in promoting arbuscule development.
- An increasing number of GRAS proteins is required for AM development.