Effects of Different Compound Treatments on Cold Resistance of Pitaya Plants

In this study, using red pulp pitaya plants variety ’Taiwan No. 6’ as experiment material, 2, 4-epitheloside (BR), betaine (GB), calcium chloride (CaCl2 ) and salicylic acid (SA) were selected as experimental factors which were set at three levels. The effects of different treatments on the cell membrane stability and osmotic adjustment substances of pitaya plants were studied by orthogonal design. The results showed that salicylic acid was the main factor affecting the relative conductivity and soluble sugar content. 2, 4-epibrassinolide was the main factor affecting the content of malondialdehyde and free proline. CaCl2 was the main factor affecting the soluble protein content. The best concentration combination for improving the cold resistance of pitaya plants was as follows: BR 1 μg/L, GB 2.5 mmol/L, CaCl2 250 mg/L, and GA 0.5 mmol/L.