水杨酸对盐胁迫下百日草种子萌发及幼苗生理特性的影响  

Effects of salicylic acid on seed germination and seedling physiological characteristics of Zinnia elegans under salt stress

作　　者：黄玉梅[1] 张杨雪 刘庆林[1] 刘盼[1] 黄胜岚[1] 

机构地区：[1]四川农业大学风景园林学院,四川成都611130

出　　处：《草业学报》2015年第7期97-105,共9页Acta Prataculturae Sinica

基　　金：国家自然科学基金项目(31201649)资助

摘　　要：以百日草品种“芳菲1号”为试材,在100mmol/L NaCl胁迫处理下,研究了不同浓度（0,0.5,1.0,1.5和2.0mmol/L）水杨酸浸种对百日草种子萌发以及不同浓度水杨酸（SA）注根和叶面喷施对幼苗生长及生理特性的影响。结果显示,SA一定程度上可以缓解盐胁迫对百日草种子萌发和幼苗生长的影响。其中,0.5,1.0,1.5mmol/L SA处理的种子具有较高的发芽势、发芽率、发芽指数、活力指数;幼苗株高、茎粗、根冠比增加;叶片叶绿素含量明显升高;超氧化物歧化酶（SOD）、过氧化物酶（POD）活性以及脯氨酸、可溶性糖、可溶性蛋白含量均变高,丙二醛（MDA）含量降低。表明0.5～1.5mmol/L的SA处理通过促进百日草叶片叶绿素合成,保护其光合作用,维持了植物的正常生长;同时,通过调节百日草抗氧化及抗渗透胁迫能力,有效缓解了盐毒害,尤其以1.0mmol/L效果最佳,2.0mmol/L的SA处理未见有明显缓解。Zinnia elegans seed （cultivar “Fangfei No.1 ”）was treated with 100 mmol/L NaCl.The effects of different concentration of exogenous salicylic acid （SA：0,0.5,1.0,1.5,and 2.0 mmol/L）on salt stress-injuries were investigated during seed germination and seedling growth.The results indicated that SA can effectively alleviate the injuries of salt stress on seed germination and seedling growth of Z .elegans .Salicylic acid increased germination vigour,germination percentage,germination index,and subsequently increased plant height,stem diameter,root∶shoot ratio,chlorophyll content,proline,soluble sugar and soluble protein content and superoxide dismutase （SOD）and peroxide （POD）activity under salt stress.However,malondialde-hyde （MDA）content （indicator of oxidative stress）was decreased by salicylic acid.Salicylic acid concentration of 1.0 mmol/L produced the best effects whereas no mitigation effects were observed on seed germination or seedling growth under salt stress at 2.0 mmol/L salicylic acid.It is suggested that salicylic acid concentrations of 0.5-1.5 mmol/L could be used to alleviate salt stress-induced injuries.

关 键 词：百日草 水杨酸 盐胁迫 

分 类 号：S681.9[农业科学—观赏园艺]