Abstract:

The experiment used two sweet sorghum and a grain sorghum varieties: ‘Sorghum cane’, ‘Four Li-mei’ and ‘Henong 16’. These varieties were for drought treatment using PEG stress. Changes of protective enzymes activities and osmotic adjustment substances (sugar content and the SOD, CAT, POD enzyme) were tested with different treatment time and concentration in three varieties and drought resistance were analyzed. The results showed that the SOD, CAT, POD enzyme activity of these three species and soluble sugar content were ‘Sorghum cane’ >’Four Li-mei’> ‘Henong 16’. The drought resistance of sorghum cane is the strongest and ‘Henong 16’ was the worst in the selected varieties; changes of protective enzymes activities and osmotic adjustment substances between varieties which drought tolerance were different. The drought-resistant of sweet sorghum is stronger than the ordinary grain sorghum varieties.