外源水杨酸对盐胁迫下番茄幼苗生理特性的影响

Effects of Exogenous Salicylic Acid on Physiological Properties of Tomato Seedlings Under Salt Stress

以盐敏感型番茄"田园六号"为试材,采用水培法,研究了培养液中不同浓度外源水杨酸(SA)(10、50、150、300mg/L)在100mg/L NaCl胁迫下,对番茄幼苗超氧化物歧化酶(SOD)活性、丙二醛(MDA)含量、根系活力、可溶性蛋白含量、可溶性糖含量以及叶绿素含量的影响。结果表明:盐胁迫增加了SOD活性,提高了MDA、可溶性蛋白和可溶性糖的含量,降低了叶绿素含量和根系活力。50mg/L SA处理后,MDA含量较只有NaCl处理的降低21.35%,而SOD活性、可溶性蛋白和可溶性糖含量则分别提高了14.15%、74.30%和33.71%,并有效缓解了叶绿素含量的降低和根系活力的下降,其缓解程度高达26.88%和82.03%。

Taking the seedlings of tomato varieties ＇Tianyuan No.6＇（salt-sensitive） as materials,the effects of different concentrations of extraneous source salicylic acid（SA）（10,50,150,300 mg/L） on superoxide dismutase（SOD） activity,MDA content,root activity,soluble protein content,soluble sugar content and the chlorophyll content of the tomato seedlings under NaCl stress（100 mg/L） were studied.The results showed that NaCl could inerease the activity of superoxide dismutase（SOD） and the content of MDA,soluble protein and soluble sugar,while decrease the content of chlorophyll and root vigor,but after further treatment with SA 50 mg/L,compared to only dealed with NaCl,MDA content decreased by 21.35%,while the activity of SOD and the content of soluble protein and sugar respectively increased by 14.15%,74.30% and 33.71%,and it prevented the decrease of chlorophyll and root vigor with 26.88% and 82.03%.