【摘要】 PSⅡ颗粒的荧光产值依SO₃^2-浓度和处理时间的增加而减少,pH7.3以上受害严重;SO₃^2-对新鲜叶绿体的光化学活性不产生伤害,对老化叶绿体伤害严重,其叶绿素的分解速度低于DCIP光还原的降低速度。Ca²⁺能减轻或消除SO₃^2-对叶绿体的伤害;对于PSⅡ颗粒则有加剧SO₃^2-伤害的作用,其规律可用Logistic方程表示。更多还原

【Abstract】 The chloroplast and PSⅡ particles isolated from spinach leaves wastreated with sulfite. The results showed that the strength of florescenceby PSⅡ particle was decreased with increase of both the sulfite concent-ration and the treatment time; that the damage was more serious whenpH 7.3; that sulfite did not damage young chloroplast but it did so tothe aged chloroplast; in which decomposition rate of chlorophyll was sl-ower than that of photoreduction of DCIP; that Ca²⁺ protected chloroplastfrom sulfite damage and accelerated the damage of PSⅡ particles; and thatthe reqular pattern can be described by of Logistic equation.更多还原