Alleviation of autotoxin-induced growth inhibition and respiration by sucrose in Cucumis sativus (L.)

作者：Zhang, Yun; Gu, Min; Xia, Xiaojian; Shi, Kai; Zhou, Yanhong; Yu, Jingquan^*

来源：Allelopathy Journal, 2010, 25(1): 147-154.

• Allelopathy
• autotoxicity
• cucumber
• gene expression
• glyoxylate cycle
• respiration
• sugar

The oil mobilization is a major source of sugar, which is. substrate of carbon and energy metabolism during seed germination and seedling growth of cucumber. Here, we analyzed the effect of cinnamic acid (CA), one of the most important autotoxins in root exudates of cucumber on sugar content, respiration rate and expression of genes involved in oil mobilization in cucumber. Exposure of seeds to CA at 0.25mM significantly reduced the seedling growth followed by a decrease in total sugar, sucrose and hexose contents and this decrease was significantly attenuated by co-imbibitions with 0.5% sucrose. There was a significant decrease in the total respiration rate (VT) and an increase in the KCN-resistant respiration rate (VKCN) when treated with CA and an opposite trend was observed in seedlings exposed to sucrose. Transcript levels for genes involved in the oil mobilization were down-regulated in germinated seeds exposed to CA and up-regulated by sucrose. Notably, the presence of sucrose in the growth medium could attenuate the inhibitory effects caused by CA on respiration and gene transcripts.

• 出版日期2010-1
• 单位浙江大学