Ecofriendly strategy based on the combination of inoculation with plant growth-promoting bacteria and reduced nitrate doses boosts the valorization of purple cauliflowers

The sugar content in the leaves of plants grown with a limited N dose (30%) and inoculated with PGPB increased by 51% compared to the control. PGPB inoculation increased proteins in the leaves (by 30% with 100% N supply, 33% with 60% N supply, and 16% with 30% N supply). Additionally, PGPB inoculation enhanced potassium (26%) and iron (34%) in leaves of plants under limited N supply. These findings indicate that the combined use of reduced N supply and PGPB inoculation may be considered an ecofriendly strategy to enhance the growth and quality of purple cauliflower, while boosting the valorization of its by-products.