葡萄幼苗在温度胁迫交叉适应过程中对水杨酸应答.pdfVIP

43 4 2007 8 643 1,2 1,* 1 2 100083 100093 SA 0 (MDA)SA SASA SA MDA SA SASA45 The Response of Salicylic Acid in Young Grape Plants during Cross Adapta- tion to Temperature Stresses ZHANG Jun-Huan 1,2, HUANG Wei-Dong1,* 1 2 College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; Institute of Forestry and Pomology, Beijing Academy of Agricultural and Forestry Science, Beijing 100093, China Abstract: This research tested the influence of heat acclimation (HA) on chilling resistance and cold acclima- tion (CA) on heat tolerance and the parallel changes in endogenous SA in leaves of two-year-old young grape plants. The results showed that the leaf cell was damaged by cold stress (0 ) and the malondialdehyde (MDA) content was rapidly increased under cold stress, the free SA content fluctuated with the cold time and then dropped to a lower level than that in normal leaves. However, in HA plants, free SA level rapidly increased to a peak and then dropped back to the normal level. Correspondingly, the MDA concentration remained relative stability and lower than that in control plants during 0 cold stress. No obvious changes in conjugated SA occurred between HA and control plants, and the change trend of total SA content was in according with the free SA. It is important that, the change tendency of all those indexes in CA plants under 45 heat stress was consistent with that in HA plants under cold stress. Key words: young grape plant; cross adaptation; salicylic acid (salicylic acidSA) (Fu 1998) (Larkindal ( Huang 200320032005) 1998) (2003 Tasgin 2006) SA SA