苹果品种过氧化氢酶活性研究

对15个苹果品种的叶片过氧化氢酶活性年度间变化和生长期酶活性变化进行了研究.结果表明,不同苹果品种过氧化氢酶活性不同,品种间和年度间均呈现显著差异.酶活性年度变化呈“大小年”状态.第一次新梢速长及果实速长时幼叶的酶活性最高,随着果实和新梢生长速度的减慢以及叶片发育程度的增加,过氧化氢酶活性呈下降趋势,但其变化与环境(温、湿)的相关不显著.各品种的过氧化氢酶活性在生长期的变化规律是一致的.生理落果之前品种的过氧化氢酶活性与座果之间有显著的负相关(r=-0.8024~*);品种或树体的结实性与过氧化氢酶有关.

A Study on Activity of Catalase in Apple Varieties

The change of catalase activity of leaves in various years and the change of the enzyme activity in the growing period for varieties of apple were studied. The results showed that there were significant differences both in the varieties and among years. The catalase activity was the highest in Starking Doyle, Grimes and Golden. At the first growing peak of shoots and fruits, the activity was the highest. Along with the decrease of the growing speed of shoots and fruits and the increase of leaf growing,the activity showed a dropping tendency, but the change of its activity related unsignificantly to the environment conditions (temperature and humidity) .The change of the activity in the growing periods of these varieties was very identical. There was a significant negative correlation between catalase activity and the percentage of setting fruit before physiological fruit drop (r = - 0.8024) . It was considered that the persentage of setting fruit in varieties or trees was related to the catalase activity.