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

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.