title: RNA-seq analysis of Medicago sativa under  Low phosphorus stress
design: we explored the impact of exogenous auxin on the morpho-physiological traits and omics profiles of alfalfa (Medicago sativa L. ) under low phosphorus stress. Twenty-day-old seedlings were transferred to either a normal phosphorus solution or a low phosphorus solution supplemented with auxin. The agronomic traits, root system architecture, and physiological parameters were characterized at 48 h and 10 d of treatment. Additionally, integrated transcriptomic and metabolomic analyses were conducted to investigate the metabolic shifts and gene regulation networks.