6种景天科多肉植物短时高温胁迫耐热性评价

Heat-Tolerance Evaluation of 6 Kinds of Crassulaceae Succulent Plants Under Brief Exposure to High Temperature Stress

为评价多肉植物的耐热性,以6种景天科多肉品种为材料,通过短时高温胁迫处理,用电导率法结合Logistic方程对其耐热性进行鉴定。结果表明,随着处理温度升高,供试材料相对电导率逐渐升高,呈"S"型曲线变化趋势。供试材料半致死温度(LT50)介于53.17~61.68℃之间。根据LT50结果,确定供试的6个景天科多肉品种的耐热性由强到弱依次为黑法师、唐印、观音莲、冰梅、福娘、乙女心。

The heat-tolerance of 6 kinds of Crassulaceae succulent plants was studied.The relative electrical conductivity combined with Logistic equation was applied to evaluate their heat-tolerance after brief exposure to high temperature.Results indicated that the relative electrical conductivity of these tested Crassulaceae succulent plants increased gradually when the temperature rose.And the incidence of the relative electrical conductivity with temperature fitted into the curve of"S".Semi-lethal temperature(LT50)of these tested plants ranged from 53.17℃to 61.68℃.Based on LT50 values,the heat-tolerance of the six tested Crassulaceae succulent plants from high to low in sequence was Aeonium arboretum‘Zwartkop’,Kalanchoe tetraphylla,Sempervivum tectorum‘Oddity’,Echeveria‘Rasberry Ice’,Cotyledon orbiculata‘Oophylla’and Sedum pachyphyllum‘Rose’.