黄连木和枳椇抗盐性比较研究

Comparative Study of Salt Resistance of Pistacia chinensis and Hovenia dulcis

以黄连木和枳椇1 a生实生苗为试材,研究了盐胁迫对黄连木和枳椇叶片细胞膜透性、丙二醛(MDA)含量、超氧化物歧化酶(SOD)和过氧化物酶(POD)活性的影响,分析其耐盐性。结果表明:随NaCl浓度增加,黄连木SOD活性升高,枳椇SOD活性呈先升高后降低变化趋势,NaCl浓度为0.15%时,SOD活性最大;2种苗木细胞POD活性均随NaCl浓度增加呈先升高后降低的趋势,且黄连木的升高幅度大于枳椇。二者的MDA含量均呈上升趋势,枳椇的升高幅度大于黄连木,表明枳椇产生了较严重的膜脂过氧化。黄连木耐盐性较强,与其具有较强的抗氧化保护酶有关。

One-year-old seedlings of Pistacia chinensis and Hovenia dulcis were used as materials for stud- ying the effect of salt stress on membrane lipid peroxidation and resistant oxidation enzyme activities. The activity of SOD showed an increasing trend in P. chinensis under salt stress, while in H. dulcis, the activ- ity of SOD increased only at low NaCl concentration first and then decreased at higher NaCl stress. The activity of POD increased at first and then decreased in both species, which was higher in P. chinensis than in H. dulcis. With the increase of NaCl concentration, the MDA content increased in both species, and the amplitude increment in H. dulcis was higher than in P. chinensis, indicating that the degree of membrane lipid peroxidation of cell in H. dulcis was more serious than in P. chinensis. These results suggested that P. chinensis had greater salt tolerance than H. dulcis, and the stronger tolerance was related to the higher anti-oxidation enzyme activities.