应用电导率法及Logistic方程测试蛇皮果抗寒性研究

Study on Cold Resistance of Snake Fruit by Application of Electrical Conductivity and Logistic Equation

对4个蛇皮果品种Bali、Pondoh、Galing和M9进行了不同低温胁迫处理，结果显示4个品种的抗寒性依次为Pondoh〉Gading〉M9〉Bali；相对电导率随着处理温度的递减而增加；叶片伤害率在5℃以下明显增大，其变化强度为：Bali〉M9〉Gading〉Pondoh。在5％显著水平上，Bali与M9的相对电导率差异不显著，与Pondoh、Gacling的差异显著；M9、Pondoh和Gading的差异不显著。在叶片伤害率上，Bali与M9间差异不显著，这两个品种与Pondoh、Gading的差异显著。蛇皮果叶片半致死温度（LT50）范围在4．0～6．0℃。结果表明用电导率评价蛇皮果的抗寒性效果较好，结合logistic方程可以稚算出蛇皮果可耐受的最低温度，为蛇皮果抗寒性栽培和我国泛热带地区引种提供理论依据。

The cold- resistance of four snake fruit varieties （Bali, Pondoh, Galing and M9） at different low temperatures was studied, the result showed that 4 varieties had the following order in cold resistance：Pondoh 〉 Gading 〉 M9 〉 Bali. The relative conduetivity of snake fruit increased along with the decrease of temperature. Leaf damage rate （ % ） of snake fruit was obviously increased below 5 ℃. Difference analysis indicated that the relative conductivity of Bali and M9 showed significant difference at significance level of 0. 05, the similar changes of leaf damage rate were also observed. LT50 of snake fruit leaves ranged from 4 ℃ to 6 ℃. The result showed that application of electrieal conductivity had better effect for estimating the cold - resistance of snake fruit, the lowest tolerant temperature of snake fruit could be deduced when the application of electrical conductivity was cooperated with Logistic equation.