Response of 14C-Salicylic Acid to Heat Stress After Being Fed to Leaves of Grape Plants

作     者：LIUYue-ping HUANGWei-dong WANGLi-jun 

作者机构：CollegeofFoodScienceandNutritionalEngineeringChinaAgriculturalUniversityBeijing100083P.R.China 

出 版 物：《Agricultural Sciences in China》 (中国农业科学（英文版）)

年 卷 期：2005年第4卷第2期

页      面：106-112页

学科分类：09[农学] 0902[农学-园艺学] 090201[农学-果树学] 

基　　金：the National Natural Science Foundation of China(30070531 30270918) 

主　　题：Grape plant Heat stress C-salicylic acid Response Leaf 14 

摘      要：An experiment was conducted to investigate the response of salicylic acid as a second messenger to the heat stress in grape plants. For this purpose, all leaves of grape (Vitis vinifera×V. labrussa L. cv. Jingxiu) plants were removed except the 3rd, 4th, 5th, 6th, and 7th ones. The 5th leaf was fed with C-SA, and the 4th and 6th leaves were exposed to high 14 temperature at 40±0.5°C. It was observed that more C-SA transported out from the 5th leaf and the distribution of C-SA 14 14 in each organ of plant altered in response to heat stress. The accumulation of C-SA in both the 4th and 6th leaves being 14 exposed to high temperature was at least three times higher than that in control. The distribution of C-SA in other distal 14 leaves (the 3rd and 7th leaf) decreased, but more C-SA accumulated in stems adjacent to the 4th or 6th leaf exposed to 14 high temperature. In addition, there was more C-SA being transported upwards or downwards while the 4th and 6th 14 leaves were exposed to high temperature respectively. Therefore, our results suggested that SA was closely involved in signal transduction of heat stress in grape plants. However, the ratio of C radioactivity assayed after SA being extracted 14 to that of direct assay with apparatus was more than 70%, which indicated about 30% C was lost or catabolized during 14 transportation.