Compact Root Architecture 2 Promotes Root Competence for Nodulation through the miR2111 Systemic Effector (Current Biology)

Legumes form symbiotic nitrogen-fixing root nodules, whose number is controlled by systemic pathways acting from shoots. Gautrat et al. show that the miR2111 microRNA is a systemic effector acting at the crossroads of the SUNN-negative and CRA2-positive pathways, allowing a dynamic fine-tuning of nodulation by nitrogen and symbiotic rhizobia.