硒对恩施碎米荠叶片光合色素及非酶抗氧化物的影响

摘要

为深入了解硒对富硒植物生长发育的促进作用,探讨了水培营养液中不同亚硒酸钠质量浓度对恩施碎米荠(Cardamine enshiensisT.Y.Xiang＆Y.Y.Wu)幼苗叶片的光合色素、还原型谷胱甘肽(GSH)、维生素C(VC)以及叶片中脂质过氧化产物丙二醛(MDA)含量的影响.结果表明,硒的质量浓度在30～90 mg/L时,可以促进恩施碎米荠叶片叶绿素b的合成；而且叶片中GSH和VC的含量有显著增加,并在45 mg/L时达到最大值；在30～60 mg/L时,叶片中的MDA生成显著减少.可见,适量的硒可以提高恩施碎米荠叶片的光合效率,促进抗氧化物的生成,抑制脂质过氧化反应.%The effect of different Na2SeO3 concentrations on the photosynthetic pigments, nonenzymatic antioxidants such as GSH and VC in Cwdamine enshiensis T. Y. Xiang & Y. Y. Wu seedling leaves was studied. The results showed that the synthesis of Chlorophyll b was improved at the Se concentration of 30-90 mg/L, the contents of GSH and VC were increased at the Se concentration of 30~90 mg/L, and reached to peak value at the Se concentration of 45 mg/L, the generation of MDA was significantly decreased at the Se concentration of 30~60mg/L. The above showed that the proper Se concentration could improve the photosynthetic efficiency, increase the content of antioxidants and inhibit lipid peroxidation in C. Enshiensis leaves.