连续变光对不同品种番茄叶片细胞膜系统的影响

以对环境条件相对不敏感的番茄(L-402)及较敏感的番茄(佳粉10号)为试材,研究了75%、50%、25%遮荫分别与100%光照交替条件下(遮荫5d,自然光照5d),不同品种番茄叶片细胞膜透性、丙二醛(MDA)含量、过氧化物酶(POD)活性的变化.结果表明连续变光条件下,叶片细胞膜透性、丙二醛含量变化相似,试验前期影响不大,后期波动性上升即遮荫阶段较对照上升幅度大,恢复光照阶段上升幅度小,二者变化呈正相关.过氧化物酶活性试验前期较对照上升,随后下降.三者均随遮光次数增加且遮荫严重时进入不可逆的变化阶段.重度遮荫变化幅度大.连续变光对佳粉10号的影响较L-402更大.

Effect of Continuous Changing Light Intensity on System of Cell Membrane of different varieties Tomato

Two cultivars of tomatoes (L-402, Jiafen 10 ) were cultivated under three levels of continuous changing light intensity which were 75% sunlight, 50%sunlight, 25% sunlight changed with natural light intensity respectively with 100% natural sunlight intensity as contrast. Treatment is shading 5 days then no shading 5 days. The results showed that relative conductivity and the content of MDA changed similarly. There is no effect on them at initial stages and then it led to fluctuant increase. Two indexes The treatment led to fluctuant change of POD activity at initial stages then decrease. The tendency is notability by increasing degree of intimidation. All indexes could not resume during natural light intensity with increasing the shading times. Effect of continuous changing light intensity on Jiafen 10 is more serious than L-402.