重金属Cr^(6+)胁迫对玉米幼苗生理生化特性的影响

Effects of Heavy Metal Cr^6+ Stress on Physiological and Biochemical Parameters of Maize Seedlings

研究了不同浓度(0,10,20,50,100 mg/L K2Cr2O7)Cr6+胁迫对玉米幼苗根和上胚轴中脯氨酸(Pro)和丙二醛(MDA)含量、细胞膜透性、超氧化物歧化酶(SOD)及过氧化物酶(POD)等保护酶活性的影响。结果表明,随着Cr6+胁迫浓度的增加,根和上胚轴中Pro含量呈先升后降的趋势,MDA含量和细胞膜透性则持续递增,SOD活性逐渐下降,POD活性先升后降。且根部对Cr6+胁迫的反应较上胚轴敏感。

The effects of different concentrations of Cr^6＋ （0,10,20,50,100 mg/L K2Cr2O7）on the content of Pro, malondialdehyde （MDA）, membrane permeability, activities of protective enzyme SOD and POD in roots and epicotyls of maize seedlings were studied. The results were as the follows： with the rising of Cr^6＋ concentration, the Pro content in both root and epicotyls was first up and then down; the content of MDA and membrane permeability increased continuously; SOD activity deceased gradually and POD activity was first up and then down. Furthermore, the roots were more sensitive than epicotyls to Cr^6 ＋ ion stress.