白皮松形成层活动周期中过氧化物酶和酯酶同工酶的变化

白皮松（ＰｉｎｕｓｂｕｎｇｅａｎａＺｕｃｃ．）枝条不同组织中过氧化酶（ＰＯＤ）和酯酶（ＥＳＴ）同工酶的酶谱也不同，而且每种组织中这两种酶的同工酶酶谱随形成层活动周期的变化而变化。在休眠期，形成层区域过氧化物酶的同工酶酶带最多，这时周皮和韧皮部中酯酶同工酶谱在正极端出现一些酶带，这可能与抗寒有关。

Changes of Peroxidase and Esterase Isozyme during Periodicity of Cambial Activity in Pinus bungeana

The seasonal changes of peroxidase and estarase isozyme in various tissues of Pinus bungeana were mere related to the annual cycle of cambial activity, and to types of the tissues. During cambial dormancy period, number of peroxidase isozyme bands in cambium region reached the maximum. In the time, some cationic estarase isozyme bands occured in the periderm and phloem, these could be related to a protective against frost. When reactitivity of cambium, two cathodic estarase isozyme bands occured in the cambial region, these could be related to enlarging of the cambial cells and formation of new xylem and phloem. During the cambial activity period, other cationic estarase isozyme bands occured in the periderm, xylem and phloem, these could be closely related to the differentiation of phloem and xylem. Some perioxidase isozyme bands disappeared during cambial reactivity, and occured during cambial dormancy period, these could be related to the changes of the level of IAA.