Dynamic Changes of Physiological Indexes Related to Cold Tolerance in Tomato Parents and F1 Hybrids

The chilling tolerance of tomato seeding can be properly evaluated by comprehensive physiological indexes. In this study, six physiological parameters of tomato parents and F(1) hybrids including soluble sugar, soluble protein, peroxidase (POD), proline (Pro), relative conductivity (EC) and malondialdehyde (AIDA) were determined and analyzed, which is correlated with chilling tolerance. The results showed that there are extremely significant difference between the tomato parents and F(1) hybris among these indexes. Compared with two tomato parents, soluble protein content, voluble sugar content, activity of POD, the content of Pro, EC, the concentration of AIDA of F(1) hybris lied between chill-endurance O-33-1 (female parent) and cold-sensitive Naiyun 2000 (male parent). These suggested that there was difference in cold tolerance between tomato parents and F(1) hybris, and F(1) hybrids inherited characteristics of the parents.