Chilling Tolerance and Physiological Parameters as Influenced by Grafting in Watermelon Seedlings  

作　　者：LIUHui-ying ZHUZhu-jun LUGuo-hua QIANQiong-qiu 

机构地区：[1]InstituteofVegetableScience,ZhejiangUniversity,Hangzhou310029,P.R.China [2]DepartmentofHorticulture,XinjiangShiheziUniversity,Shihezi832003,P.R.China

出　　处：《Agricultural Sciences in China》2003年第10期1164-1169,共6页中国农业科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(30230250);the Ministry of Science and Technology of China(2001BA503B08-2).

摘　　要：The influences of different rootstocks on chilling tolerance and physiological parameters in watermelon seedlings have been studied. The results showed that grafting improved the chilling tolerance. Compared with own-rooted watermelon seedlings, the grafted watermelon seedlings had lower chilling injury index, lower electrolytic leakage (%), lower malondialdehyde (MDA) content, higher chlorophyll and proline content, and higher activities of superoxide dismutase (SOD), ascorbate peroxidase (AsA-POD) and dehydroascorbate reductase (DR) in the leaves under low temperature stress. There was a considerable difference of chilling tolerance among different grafted watermelon seedlings due to the difference of rootstock chilling tolerance. After low temperature treatment, the grafted seedling with higher chilling tolerance had lower electrolytic leakage (%),lower MDA content, higher proline content and higher activities of SOD, AsA-POD and DR in the leaves compared with the grafted seedling with weaker chilling tolerance. From these, we could conclude that chilling tolerance of watermelon seedlings may be related to higher antioxidative ability and membrane stability in the plants. The chilling tolerance of grafted seedling could be properly evaluated by comprehensive physiological indexes but not a single physiological index.The influences of different rootstocks on chilling tolerance and physiological parameters in watermelon seedlings have been studied. The results showed that grafting improved the chilling tolerance. Compared with own-rooted watermelon seedlings, the grafted watermelon seedlings had lower chilling injury index, lower electrolytic leakage (%), lower malondialdehyde (MDA) content, higher chlorophyll and proline content, and higher activities of superoxide dismutase (SOD), ascorbate peroxidase (AsA-POD) and dehydroascorbate reductase (DR) in the leaves under low temperature stress. There was a considerable difference of chilling tolerance among different grafted watermelon seedlings due to the difference of rootstock chilling tolerance. After low temperature treatment, the grafted seedling with higher chilling tolerance had lower electrolytic leakage (%),lower MDA content, higher proline content and higher activities of SOD, AsA-POD and DR in the leaves compared with the grafted seedling with weaker chilling tolerance. From these, we could conclude that chilling tolerance of watermelon seedlings may be related to higher antioxidative ability and membrane stability in the plants. The chilling tolerance of grafted seedling could be properly evaluated by comprehensive physiological indexes but not a single physiological index.

关 键 词：WATERMELON Low temperature stress Grafted seedling Chilling tolerance 

分 类 号：S651[农业科学—果树学]