The chilling injury parameter and seven kinds of physiological and biochemical parameters of chilling-tolerance were investigated in the 2-year-old cuttings of two cultivars of Jasminum sambac L. ( single petal jasmine and double petal jasmine) ,under the condition of natural cooling in 2009 year,Nanjing City. The results showed that the chilling injury index,the relative elec-trolyte leakage,the thiobarbituric acid reactive substances content,and proline content increased significantly; the soluble protein...