基于Logistic方程分析方法的木瓜属观赏植物耐寒性研究

Study on cold resistance of Chaenomeles ornamental plants based on Logistic equation analysis

为了对木瓜属(Chaenomeles)观赏植物耐寒性进行研究,选择3种不同的木瓜树种为研究对象,研究其在9月至次年1月的含水量、淀粉含量、可溶性糖、过氧化物酶(POD)、超氧化物歧化酶(SOD)和相对导电率等生理生化指标。利用Logistic方程拟合求解半致死温度,并通过隶属函数法计算隶属均值,综合评价其耐寒性。结果表明,随着抗寒性的提高,3种木瓜树种可溶性糖含量、POD活性和SOD活性均提高,与抗寒性的变化趋势相同;3种木瓜树种茎的抗寒能力强弱顺序为日本木瓜<皱皮木瓜<光皮木瓜。

In order to study the cold tolerance of ornamental plants of the genus Chaenomeles,three different types of Chaenomeles trees were selected as research objects,and their water content,starch content,soluble sugar,and peroxidase(POD),superoxide dismutase(SOD)and relative conductivity and other physiological and biochemical indicators from September to January of next year.Then the Logistic equation was used to solve the semi-lethal temperature,and the membership mean was calculated by the subordination function method to comprehensively evaluate its cold resistance.The results showed that with the increase of cold resistance,the soluble sugar content,POD activity and SOD activity all increased,and the change trend was the same as that of cold resistance.The cold resistance of the stems of the three tree species was Chaenomeles japonica(Thunb.)Lindl.ex Spach<Chaenomeles speciosa(Sweet)Nakai<Chaenomeles sinensis(Thouin)Koehne.