biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 64:150-158, 2020 | DOI: 10.32615/bp.2019.151

The enhancement of salt stress tolerance by salicylic acid pretreatment in Arabidopsis thaliana

L.-L. YU1, Y. LIU1, F. ZHU3, X.-X. GENG1, Y. YANG1, Z.-Q. HE2,*, F. XU1,*
1 Applied Biotechnology Center, Wuhan University of Bioengineering, Wuhan 430415, P.R. China
2 Biotechnology Research Center, China Three Gorges University, Yichang 443002, P.R. China
3 College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, P.R. China

Salicylic acid (SA) is an important plant hormone involved in the activation of defense responses against environmental stresses. However, there are still large of unsolved mysteries about how SA pretreatment affects the establishment of plant stress tolerance. In this study, application of SA at different concentrations and different times were conducted to investigate their effects on the response of Arabidopsis seedlings to salt stress. The pretreatment with 10 or 20 μM SA for more than 6 h promoted Arabidopsis seedlings resistance to salt stress. On the other hand, pretreatment with 200 μM SA reduced Arabidopsis resistance to salt stress and aggravated oxidative damage to the seedlings. At all concentrations used, SA pretreatment inhibited the total respiration and promoted reactive oxygen species (ROS) generation. However, the ROS content in 10 or 20 μM SA pretreated seedlings decreased to the basal level within 6 h and high activities of antioxidant enzymes and alternative oxidase were maintained. Notably, the SA-enhanced salt stress resistance was significantly impaired by blocking alternative oxidase (AOX) pathway. Our findings indicate that SA-mediated salt stress response is in a dose- and time-dependent manner and that the effects were related to the induction of AOX capacity and antioxidant system.

Keywords: alternative oxidase, antioxidant enzymes, reactive oxygen species, resistance index.

Received: March 6, 2019; Revised: October 21, 2019; Accepted: December 2, 2019; Published online: February 26, 2020  Show citation

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YU, L.-L., LIU, Y., ZHU, F., GENG, X.-X., YANG, Y., HE, Z.-Q., & XU, F. (2020). The enhancement of salt stress tolerance by salicylic acid pretreatment in Arabidopsis thaliana. Biologia plantarum, 64, Article 150-158. https://doi.org/10.32615/bp.2019.151
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