外源过氧化氢对盐胁迫下水稻幼苗根系生长和抗氧化系统的影响  

Effects of Exogenous Hydrogen Peroxide on Root Growth and Antioxidant System of Rice Seedlings under Salt Stress

作　　者：徐芬芬[1] 徐鹏[1] 胡志涛[1] 夏晓蕾 XU Fen-fen XU-peng HU Zhi-tao XIA Xiao-lei(Life Science College, Shangrao Normal University, Shangrao, Jiangxi 334000, Chin)

机构地区：[1]上饶师范学院生命科学学院,江西上饶334000

出　　处：《杂交水稻》2017年第1期74-77,共4页Hybrid Rice

基　　金：江西省教育厅科技项目(GJJ151055)

摘　　要：通过添加外源H_2O_2的方式,研究了H_2O_2对盐胁迫下水稻幼苗根系形态和抗氧化系统的影响。结果表明,低浓度的H_2O_2(5~100μmol/L)均可促进盐胁迫下水稻幼苗根系生长和根毛分化,诱导根系SOD、POD和CAT活性增强,增加脯氨酸含量,降低MDA含量,增强其抗盐性,但H_2O_2处理浓度过高(500μmol/L)时反而加重了根系的氧化胁迫伤害。The effects of exogenous H2O2 were studied on root morphology and antioxidant system of rice seedlings under the conditions of salt stress （100 mmol/L NaCl）. The results showed that the treatments with lower concentrations of H202 from 5 to 100 μmol · L-1 promoted the growth of roots and the differentiation of root hairs, and induced the enhancement of SOD, POD and CAT activities, increased the proline content but decreased the content of MDA in the seedling roots, under the salt stress conditions, indicating the improvement of rice seedling salt tolerance with the addition of exogenous H2O2. However, when the concentration of exogenous H2O2 was as high as 500μmol · L-1, the oxidative stress damage of rice roots occurred.

关 键 词：外源H2O2 水稻 幼苗 根系生长 抗氧化系统 

分 类 号：S511.034[农业科学—作物学] S332