外源水杨酸对番茄耐盐性的影响

Effect of Exogenous Salicylic Acid on the Tolerance of Tomato Seeding to Salt

[目的]探讨外源水杨酸(SA)对番茄耐盐性的影响,为SA在番茄生产中的应用提供理论依据。[方法]在盐胁迫条件下,对番茄喷施不同浓度(1、2、5mmol/L)的SA,测定其叶片叶绿素含量、可溶性糖含量、过氧化物酶(POD)活性、相对电导率及根系活力,研究外源SA处理对番茄幼苗耐盐性的影响。[结果]外源SA能不同程度地提高番茄叶片叶绿素含量、可溶性糖含量、POD活性和根系活力,而降低叶片相对电导率。其中浓度2mmol/LSA对叶绿素含量、POD活性和相对电导率的影响最佳,而浓度5mmol/LSA对可溶性糖和根系活力的影响较大。[结论]外源SA能够提高番茄幼苗的耐盐性,但适宜施用浓度和施用周期尚需进一步研究。

[Objective] The theoretic basis of the application of salicylic acid（SA） in tomato planting was provided through the study on the effect of exogenous SA on the tolerance of tomato seeding to salt stress. [Method] SA with different concentrations（1 mmol/L,2 mmol/L or 5 mmol/L） was applied on tomato seeding under salt stress. The content of chlorophyll,the activity of POD,the content of solubme sugar,the relative electrical conductivity of leaf and the activity of root system were measured for the analysis of the efficiency. [Result]The result showed that content of chlorophyll,the activity of POD,the content of soluble sugar and the activity of root system were increased and the relative electrical conductivity of leaf was decreased after the treatment of SA. The concentration of SA at 2 mmol/L showed the most effect on the content of chlorophyll,the activity of POD and the relative electrical conductivity of leaf. While the concentration of SA at 5 mmol/L showed the most effect on the content of soluble sugar in leaf and the activity of root. [Conclusion] The application of exogenous SA enhanced the tolerance of tomato seeding to salt. However,the suitable concentration and applying period of it needed to be studied further.