Issue Archive

Some enzymatic reactions related to chlorophyll degradation in cucumber cotyledons under chilling in the light

Zeng Shaoxi, Wang Yirou, Liu Hongxian

S China Inst. Bot., Acad. Sin.

Abstract

When cucumber seedlings were exposed to chilling and light, it was observed that chlorophyll content and catalase activity decreased markedly with the time then peroxidase activity increased markedly, while ascorbate peroxidase activity increased only sightly. The degradation of chlorophyll in cucumber cotyledons exposed to chiling and light was positively correlated to the decrease of catalase activity, and negatively correlated to the increase of peroxidase activity. By using protein synthesis inhibitor and some other chemical agents, it was found that chlorophyll degradation of cucumber cotyledons was retarded by cycloheximide (CHM) and inhibited by ascorbate (AsA), [3-(3,4-dichlorophenyl)-1, 1-dimethylurea] (DCMU), ALPHA-tocopherol (Vit E) and propyl gallate (PG), but promoted by H sub(2) O sub(2), sodium glycolate and methyl viologen (MV).

Key words: Chilling and Light;Chlorophyll;Peroxidase;Catalase;Ascorbate peroxldase

Received: 　　Accepted:

Corresponding author: 　　E-mail:

Citing This Article：

Zeng Shaoxi, Wang Yirou, Liu Hongxian. Some enzymatic reactions related to chlorophyll degradation in cucumber cotyledons under chilling in the light. Acta Physiol Sin 1991; 43 (2): (in Chinese with English abstract).