关键词: 乐东拟单性木兰, 自然低温, 生理学特性, 抗寒性

Abstract: To analyze the cold resistance of Parakmeria lotungensis, its membrane leakage, contents of dissociative praline, soluble sugar, POD and chlorophyll were investigated under the conditions of natural low-temperature in Nanjing. The major results were as follows: In study period, the trends of contents of chlorophyll were similar to the monthly even low temperature with a small radian. The membrane leakage continuously improved. The contents of soluble sugar was negatively correlative with the monthly even low temperature during the over-wintering. The contents of dissociative praline and the activity of POD firstly increased and then decreased.

Key words: Parakmeria lotungensis, natural low temperature, physiological characteristics, cold resistance