盐胁迫对高羊茅生长及抗氧化系统的影响

研究了不同浓度NaCl(0,50,100,200,300 mmol/L)胁迫对高羊茅生长及抗氧化系统的影响。结果表明,中、低浓度(50,100 mmol/L)盐胁迫下,高羊茅生物量和MDA含量与对照组相比没有显著变化;高浓度(200,300 mmol/L)盐胁迫后,生物量明显降低,MDA含量显著升高。抗氧化酶(SOD、POD、CAT)活性随着盐胁迫时间的延长先上升后下降,盐浓度越高3种酶活性下降幅度越大。盐胁迫初期,除类胡萝卜素含量略有上升外,GSH和还原型AsA均有不同程度的下降,随着胁迫时间的延长,3种抗氧化物质含量逐渐降低,200,300 mmol/L盐处理下降明显。

Effects of salinization stress on growth and the antioxidant system of tall fescue

The effects of different concentrations of NaCl(0,50,100,200,300 mmol/L) on growth and on the antioxidant enzyme system of tall fescue(Festuca arundinacea) were studied.The biomass and MDA content were not significantly affected when tall fescue were stressed by 50,100 mmol/L of NaCl as compared with the control,but the biomass of tall fescue was significantly reduced and MDA content increased significantly when stressed by 200 and 300 mmol/L of NaCl.The activities of superoxide dismutase(SOD),peroxidase(POD) and catalase(CAT) initially increased but then decreased with duration of NaCl treatment.The higher the concentrations of NaCl,the more the enzyme activities were reduced.Contents of AsA and GSH gradually decreased while carotenoid content increased initially but with prolonged duration of NaCl treatment,concentration of the three antioxidants decreased,especially at the 200 and 300 mmol/L concentrations.