不同种源香椿苗木茎部抗寒性的研究

Study on Cold Tolerance of Stems of Toona sinensis Seedlings from Different Provenances

以10个种源1年生香椿实生苗为试材,研究了不同低温处理对其茎部的含水量、自由水含量、束缚水含量、自由水/束缚水比值等水分状态及可溶性糖、脯氨酸等渗透调节物质含量的影响。结果表明:5^-5℃范围内,茎部含水量、自由水含量、自由水/束缚水比值逐渐降低;束缚水含量、可溶性糖含量、脯氨酸含量逐渐升高,不同种源各试验指标含量与其低温半致死温度呈现显著或极显著负相关关系。

Taking one-year-old Toona sinensis seedlings from 10 different peovenances as materials,moisture content,free water content,bound water content,the ratio of free water to bound water and soluble sugar content,proline content of stems of Toona sinensis were analyzed.The results showed that moisture content,free water content and the ratio of free water to bound water reduced in five degree centigrade to five degree centigrade below zero.The bound water content,soluble sugar content,proline content increased in the same conditions.The results indicated that the contents of indicators and half lethal temperature showed（significantly）negative correlation.