仁用杏树多酚氧化酶活性的年变化规律研究

对华北地区主要经济树种仁用杏树各器官在不同生育期问四种不同处理下的多酚氧化酶(PPO)活性进行了测定，结果表明：(1)仁用杏树体各器官内的多酚氧化酶活性在整个年循环周期内呈规律性变化。叶中PPO活性整体水平在10月份最高；枝、干、主根、侧根中的PPO活性均以5月和3月极显著地高于7月和10月。(2)PPO活性与仁用杏树体的抗寒性、地上部分的生长发育有关，并可作为仁用杏树抗寒性的生化指标。(3)Cu、Zn两种营养元素通过影响PPO活性来影响仁用杏树生长。

Studies on the Annual Changing Law of the Activity of PPO in Kernel-Apricot

The activity of PPO of 5 various organs in 4 different growth period of Kernel-apricot was analysed. The results showed that:(1)The activity of PPO of various organs had a orderly change,the activity of PPO of leaves reached the maximum; the activities of PPO of branch, truck, thick root ,thin root were higher in May and March than in July and October conspicuously.(2)The activity of PPO was related to cold resistance and growth of the part above the soil surface of Kernel-apricot, and it could be used as biochemical index of adverse circumstances resistance of Kernel-apricot.(3)Cu and Zn,as nutrient elements,had effects on the activity of PPO,so as to affect the growth of Kernel-apricot.