The combined treatments of brassinolide and zeaxanthin better alleviate oxidative damage and improve hypocotyl length, biomass, and the quality of radish sprouts stored at low temperature

•Combined treatment ofZ + BR raised hypocotyl length and biomass compared with Z or BR.•BR alone or combined with Z improved flavone and protein content compared with Z.•Z alone or combined with BR enhanced ABTS level compared with BR alone.•Combined treatment of Z + BR improved Fv/Fm value compared with Z or BR.