Abstract: The banana (Musa acuminata AAA group) seedlings were sprayed with single or mixed H₂O₂ and CaCl₂ and exposed to 7 ℃low temperature for 24 h. The increase of POD activities and soluble sugar contents and alleviation of cell membranes leakage and chlorophylls decomposition in banana seedling leaves were observed during cold stress and recovery periods. The mixed H₂O₂ and CaCl₂ had a synergism on these aspects. The results also showed that H₂O₂ had better effects in increasing peroxidase activities and Chl . b contents than those of CaCl₂ , but CaCl₂ had advantage effects on soluble sugar and Chl . a contents. POD activies had a significant opposite realation with electric leakage and it may suggest that increasing POD activities could help to decrease the leakage of cell membranes during low temperature period.

Key words: H₂O₂, CaCl₂, Peroxidase activities, Membrane leakage, Soluble sugar, Chlorophylls