Abstract:

In order to clarify the relationship between the enzyme activities and fruit shrink disease resistance in different jujube varieties, and providing a referential biochemical marker to identify disease resistant variety. During the growing period of jujube fruit, the fruits of different jujube varieties with different fruit shrink disease resistance were collected regularly, and the activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) and phenylalanine ammonialyase (PAL) in the jujube fruits were tested. The results showed that the significant differences of protective enzyme activities existed in different jujube varieties. On the early stage of jujube fruit developing, there existed a certain degree of negative correlation between the POD activity and variety resistance, but with fruit growth, the increases of POD activity in resistant varieties were higher than that in susceptible varieties; in August- jujube growth critical period, there was a certain positive correlation between the activities of SOD, PAL and variety resistance, and the increases of SOD activity in resistant varieties were earlier than susceptible varieties. The variation of the CAT activity existed between different varieties in the same period but no regularity to follow. There were certain regularity relationships between the activities of POD, SOD, PAL during development of jujube fruit and the variety resistance, which could be used as referential biochemical markers for disease resistance identification.