低温胁迫下草莓花半致死温度的研究

摘要

为了确定草莓花的抗寒能力,比较不同草莓品种的抗寒性,以宁玉、红颊草莓花为试材,研究不同低温胁迫下组织电解质外渗率(REC)的变化,配合Logistic方程,测定其半致死温度(LT50)；在半致死温度下设置不同时间,测定REC的变化.结果表明,随着处理温度的降低和处理时间的延长,宁玉、红颊草莓花的电解质外渗率呈S型曲线,LT50分别为-3.41℃、-2.78℃,1.5 ～3.5h为草莓花在LT50下临界冷害时间.%In order to determine the cold hardiness of flowers of two strawberry varieties, ' Ningyu ' and ' Benihope' , the semilethal temperatures (LT50) of them were calculated based on the changes in electrolyte leakage rates ( REC) under different low temperature stresses and with the Logistic equation, the semilethal temperatures were detected. The results showed that with the temperature decreased and the treatment time prolonged, the RECs of the flowers of the two varieties showed a S -shaped curve, LT50 for 'Ningyu' was -3.41 ℃ while that of ' Benihope' was -2. 78 ℃ . The treatment time from 1.5 h to 3. 5 h was the threshold of chilling injury at LT50.