外源亚精胺对小白菜抗盐性的诱导及其机理

SPD induced salt resistance and mechanism in Chinese cabbage

关键词:  小白菜  亚精胺  耐盐性  生理机制

Key words:  Brassica campestris ssp.chinensis   SPD  salt tolerance  physiological mechanism

摘要:

采用SPD根际注射结合叶面喷施的方法，研究了不同浓度(0、50、100、150、200 mg/L)外源SPD对小白菜生长及其生理生化特性的影响。结果表明，100～150 mg/L SPD诱导能显著提高盐胁迫下小白菜的株高、单株干重、单株鲜重和含水量等；降低叶片丙二醛(MDA)含量；增强叶片超氧化物歧化酶(SOD)、过氧化物酶(POD)等植物细胞保护酶的活性；显著提高盐胁迫下小白菜植株的叶绿素含量和净光合速率。

Abstract:

We studied the effects of exogenous SPD of different concentration 0，50，100，150，200 mg/L on the physiological parameters in Chinese cabbage by the method of rhizosphere and foliar spraying. The results were as follows:SPD of 100-150 mg/L significantly improved the plant height，plant dry weight，plant fresh weight and plant water content，reduced the malondialdehyde(MDA)content. enhanced superoxide dismutase(SOD)，peroxidase(POD)enzyme activity of leaf，significantly increased the chlorophyll content and the net photosynthetic rate of Chinese cabbage under the salt stress.