Abstract:

In order to study the influence of low temperature on the physiological characteristics of ‘Yanshan’ Chestnut Branches, the test materials were collected from one year robust branches of ‘Yanlong’ chestnut. In different low temperature conditions, conductivity, the content of MDA, the activity of PPO and the rate of graft were tested. The electrolyte leakage rate and the damage degree of chestnut branches were increasing with the temperature decreasing. Above -20℃, the content of MDA was increasing with the temperature decreasing. At -20℃, the content of MDA was highest; at -25℃, the content of MDA was back to a very low level. Above -20℃, the activity of PPO was decreasing with the temperature decreasing, but under -20℃ the activity of PPO was increasing. The rate of survival was decreasing with the temperature decreasing. It had the highest rate of survival at 0℃ (60%). The rate of survival was 0% under -20℃. -20℃ was the limit temperature of ‘Yanshan’ Chestnut Branches. There were inflexion of the content of MDA and the activity of PPO at -20℃. It was confirmed preliminarily that used the temperature of the content of MDA and the activity of PPO to ensure the limit temperature of plant can bear.