Fig. 5

Phenotypic and physiological changes of chrysanthemum at different low temperatures. a Phenotypic comparison of chrysanthemum in four different treatments. b Histochemical staining with DAB and NBT for assessing the accumulation of H₂O₂ and O₂⁻, respectively, under low temperatures. c-g Analysis of relative electrolyte conductivity c, POD activity d, CAT activity e, proline content f, and soluble sugar g under low temperatures. Data represent means and standard errors of three replicates. The different letters above the columns indicate significant (P < 0.05) differences according to Duncan’s multiple range test