低温弱光对温室番茄生理特性的影响

研究了番茄初花期低温弱光逆镜对叶片膜保护酶（SOD）活性，膜脂过氧化产物MDA含量、叶绿素a荧光诱导动力学参数Fv/Fm值和内源激素水平的影响。结果表明，叶片内源激素水平对低温弱光的反应随品种和处理强度不同而有较大差异。低温弱光处理后，SOD活性显著下降，MDA含量明显增加;荧光参数Fv/Fm值增加，碳同化活性降低，影响程度取决于品种和低温弱光强度。毛粉802比Skala耐低温，而Skala则比毛粉802更耐弱光。

Effects of Low Temperature and Poor Light on Some Physiological Parameters of Tomato

Influences of low temperature and poor light on some physiological parameters of tomato (Lycopersicon esculentum Mill. ) seedling were studied in illuminating incubator. The content of membrane-lipid peroxidation (MDA), activities of membrane-protecting enzyme (SOD), fluorescence parameter Fv/Fm of chlorophyll induction kinetic curves and endogenous hormones level were measured under low temperature and poor light stress after 7 days of treatment. Results showed that membrane-lipid peroxidation (MDA) increased and activity of membrane-protecting enzyme (SOD) decreased after low temperature and poor light stress. The fluorescence parameter Fv/Fm increased and CO2 assimilation efficiency decreased in a stress intensitg-dependence manner. The endogenous hormones level, including IAA, ABA, GA3, ZR, changed differently with stress treatments. These data indicated the difference between the varieties of tolerance to low temperature and poor light stress.