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Journal of Agriculture ›› 2017, Vol. 7 ›› Issue (6): 56-62.doi: 10.11923/j.issn.2095-4050.cjas17010019

Special Issue: 生物技术 园艺 农业生态

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Resistance of Different Apple Varieties against Apple Moldy Core and Its Physiological and Biochemical Mechanism

  

  • Received:2017-01-17 Revised:2017-03-07 Accepted:2017-03-25 Online:2017-06-28 Published:2017-06-28

Abstract: To estimate resistance of different apple varieties against apple moldy core and role of defense enzymes in apple against moldy core. In this study, the incidence of moldy core of different apple cultivars was investigated in field. The incidence area and changes of defense enzymes activities were of different apple cultivars after inoculation with A. alternata and T. roseum were studied. In field, the moldy core incidence of different apple varieties was variety, the order is ‘Gala’, non-bagged ‘Golden Delicious’ ‘Golden Delicious’> Red ‘Fuji’ and ‘Starking’. The activity of polyphenol oxidase (PPO) of different apple cultivars was significantly increased after inoculation with T. roseum and A. alternata. The order of increase of different cultivars was ‘Gala’> ‘Golden Delicious’> ‘Starking’> Red ‘Fuji’. The CAT activity of ‘Gala’, ‘Golden Delicious’ and ‘Starking’ apple fruits was significantly inhibited after inoculation with T. roseum and A. alternata, while CAT activity of Red ‘Fuji’ fruits was increased after inoculation with both pathogens. The above results show that, there was a significant positive correlation between the incidence of apple moldy core and the opening rate of calyx tube. Bagging could lead to an increase in the opening rate of fruit calyx tube. ‘Gala’ apple had the strongest resistance to A. alternata, while ‘Golden Delicious’ had the strongest resistance to T. roseum. Red ‘Fuji’ apple was the most susceptible to both pathogens. POD, PPO and CAT play an important role in the process of apple defense the moldy core.

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