Symbiotic nitrogen fixation: a launchpad for investigating old and new challenges

Abstract

Legumes establish symbiotic relationships with nitrogen-fixing bacteria to convert atmospheric nitrogen into usable forms within root nodules, a process regulated by complex signalling, gene expression, and energy balance. In this Virtual Issue, research articles and reviews that discuss the latest plant-oriented advances in biological nitrogen fixation were collected to provide an updated view of the biochemical and molecular aspects of different steps of the nodulation process.