皱叶菊苣焦叶病发生机制初探

A Preliminary Approach to the Genetic Mechanism of“Couronnage”of Curly Chicory

研究了皱叶菊苣焦叶病与叶片中酚类物质的含量、PAL和PPO活力的关系,并对褐变主要底物进行鉴定。结果表明:病叶的总酚和绿原酸含量以及PAL和PPO活力都有显著增加,且主要发生在发病部位,绿原酸是PPO作用的主要底物,酶促褐变是导致焦叶病的主要内在原因。

The relationship between“couronnage”of curly chicory and the contents of phenolic com- pounds as well as the activities of PAL and PPO in the leaves was studied;and the main browning substrate was identified.The results showed that there were great increases in the contents of the total pheholic com- pounds,chlorogenic acid and the activities of PAL,PPO in the diseased leaves compared with those in the healthy leaves.All these changes mainly occurred in and around the zones of necrosis It is evident,that chlorogenic acid is the principal substratc of PPO reaction.The enzymic browning reaction is the main inter- nal cause of the“couronnage”of curly chiory.