外源SA预处理对低温胁迫下萝卜幼苗的生理效应  

Physiological Effects of Exogenous Salicylic Acid on Radish Seedlings under Low Temperature Stress

作　　者：初敏[1] 王秀峰[1,2] 王淑芬[3] 杨凤娟[1,2] 魏珉[1,2] 史庆华[1,2] 

机构地区：[1]山东农业大学园艺科学与工程学院,山东泰安271018 [2]山东农业大学作物生物学国家重点实验室,山东泰安271018 [3]山东省农业科学院蔬菜研究所,济南250100

出　　处：《西北农业学报》2012年第2期142-145,183,共5页Acta Agriculturae Boreali-occidentalis Sinica

基　　金：山东省财政支持重大应用技术创新课题[鲁财农指(2009)45号]

摘　　要：以阳春早秀萝卜幼苗为试材,通过叶面喷施适宜浓度的水杨酸(SA),探讨外源SA对低温胁迫下萝卜幼苗的缓解效应。结果表明,0.75mmol.L-1SA预处理幼苗后,随低温处理时间延长,可溶性糖和脯氨酸质量分数逐渐升高,抗氧化酶活性也显著高于同期对照,而丙二醛(MDA)质量摩尔浓度显著低于同期对照。因此,适当浓度的外源SA可通过增加渗透调节物质质量分数和提高抗氧化酶活性来提高萝卜幼苗对低温胁迫的抗性。Alleviating effect of exogenous salicylic acid（SA） on low temperature stress was elucidated by foliar-sprayed with appropriate concentration SA（0.75 mmol·L-1）,taking the seedlings of radish Yangchunzaoxiu as test materials.The results manifested that the soluble sugar and proline mass fraction were up-regulated as the time extended and the activities of the antioxidant enzyme were also markedly higher than that in control at the same time.However,the MDA molality was markedly lower than that in control at the same time.These results indicate that exegenous appropriate concentration SA could mitigate the low temperature stress to radish seedlings by increasing the osmotic adjustment materials mass fraction and promoting the activities of antioxidant enzyme.

关 键 词：水杨酸 萝卜 低温胁迫 生理效应 

分 类 号：S631.1[农业科学—蔬菜学]