Abstract: The relative electric conductivity, soluble sugar content in leaf, and PODactivity of 17 plum varieties, which belong to six species and one genera, were measured under artificial adverse environments. The results showed that there were extreme significant negative correlation (α=0.01) between soluble sugar content and membrane freezing damage, and significant negative correlation (α=0.05) between POD activity in bark and leaf cell heat damage. According to Fuzzy synthetic evaluation, the comprehensive resistances of different plum varieties to adverse circumstances were discussed in this paper.

Key words: Prunus sp., Resistance, Physiological characteristics, Synthetic evaluation