低剂量UV-B辐射增强对两优培九功能叶抗氧化系统的影响

Effects of Ultraviolet-B Radiation on Activities of Antioxidant Systems in Liangyoupeijiu Plants under Low Doses

在UV-B辐射增强条件下,研究了功能叶抗氧化系统的变化。结果表明,UV-B辐射胁迫使功能叶抗氧化物酶超氧化物歧化酶(SOD)和过氧化氢酶(CAT)的活性先升后降再上升,过氧化物酶(POD)活性上升;抗氧化物质类还原型谷胱甘肽(GSH)含量和还原型抗坏血酸(ASA)含量提高,但增幅逐渐减少。功能叶活性氧(O-·2)累积,丙二醛(MDA)相对含量先升高后下降,可溶性蛋白含量则相反。

The changes of antioxidant systems in functional leaves under enhancing ultraviolct-B radiation were investigated. The results showed that antioxidant enzymes superoxide dismutsse （SOD） and eatalase （CAT） activities increased sigeficianfly at first, then decreased, elevated at last. Peroxidase （POD） activities tended to increase; The contents of antioxidant substances ascorbic acid （ASA） and glutathione （GSH） increased under a long term UV-B stress, but amplitude was becoming smaller. The relative contents of hydrogen peroxide （ O2- ） and malen-dialhyde （MDA） increased at first, then slowly decreased.