钼酸钠对低温胁迫下狼尾草渗透调节物质和膜稳定性的影响

以狼尾草（Pennisetum alopecuroides）为材料，研究了不同质量浓度的钼酸钠对低温胁迫下狼尾草幼苗中几种渗透调节物质含量和细胞膜稳定性的影响。结果表明，钼酸钠可显著提高低温胁迫下的狼尾草叶片总叶绿素、可溶性蛋白质、抗坏血酸、可溶性糖、游离脯氨酸等物质的含量，降低丙二醛含量和细胞膜透性，缓解狼尾草受到的低温冷害；钼酸钠缓解低温胁迫的最低效应质量浓度为0.5 mg·L-1，且在0.5~5.0 mg·L-1质量浓度范围内对狼尾草渗透调节物质和细胞膜稳定性的影响无显著差异。

Effects of sodium molybdate on osmolytes and membrane stability of Pennisetum alopecuroides seedlings under low temperature stress

Effects of different concentrations of sodium molybdate on osmolytes and membrane stability of Pennisetum alopecuroides seedlings under low temperature stress were investigated in this study.Results of experiments indicated that sodium molybdate application in P.alopecuroides seedlings induced a dramatic increase in total chlorophyll,soluble protein,ascorbic acid,soluble sugar and free proline contents under low temperature stress.Sodium molybdate application also caused a significant decrease in malondialdehyde content and membrane permeability.The lowest effect concentration of sodium molybdate application was 0.5mg.L-1 to alleviate the low temperature stress.There was no significant difference in osmolytes and membrane stability of P.alopecuroides seedlings treated with sodium molybdate at the 0.5～5.0mg.L-1 concentration range.It could be speculated that sodium molybdate application enhanced cold resistance by increasing the osmolyte content and alleviating membrane damage in P.alopecuroides seedlings under low temperature stress.