biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 64:604-615, 2020 | DOI: 10.32615/bp.2020.090

Exogenous melatonin enhances salt stress tolerance in tomato seedlings

M.A. ALTAF1, R. SHAHID1, M.X. REN1,2,*, S. NAZ3, M.M. ALTAF4, A. QADIR5, M. ANWAR6, A. SHAKOOR7, F. HAYAT8
1 School of Life and Pharmaceutical Sciences, Hainan University, Haikou 570228, P.R. China
2 Center for Eco-Environmental Restoration Engineering of Hainan University, Haikou, 570228, P.R. China
3 Faculty of Agricultural Science and Technology, Bahauddin Zakariya University Multan 60800, Pakistan
4 College of Ecology and Environment, Hainan University, Haikou 570228, P.R. China
5 Agricultural Training Institute, Karor, Layyah, Punjab, Pakistan
6 College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518060, P.R. China
7 Department of Environment and Soil Sciences, University of Lleida, E-25198 Lleida, Spain
8 College of Horticulture, Nanjing Agriculture University, Nanjing 210095, P.R. China

Melatonin (N-acetyl-5-methoxytryptamine) is an essential molecule which regulates plant growth and development and alleviates the damaging effects of abiotic stresses. To evaluate the important functions of melatonin in response to salinity stress, the effects of exogenous melatonin on the antioxidant system and growth of tomato (Solanum lycopersicum L.) under 150 mM NaCl stress were investigated. The application of 100 μM melatonin compensated the growth inhibition caused by salt-stress. Melatonin treated seedlings had an increased fresh and dry masses of shoots and roots. The application of 1 - 200 µM melatonin notably enhanced the relative chlorophyll content (SPAD index), root characteristics, and gas exchange in tomato seedlings subjected to salt stress compared to seedlings treated with salt stress alone. Moreover, melatonin pretreatment minimized accumulation of reactive oxygen species and improved activities of antioxidative enzymes including catalase, superoxide dismutase, glutathione reductase, and ascorbate peroxidase.

Keywords: abiotic stresses, antioxidative enzymes, chlorophyll, NaCl, oxidative damage, photosynthesis.

Received: April 23, 2020; Revised: June 4, 2020; Accepted: June 9, 2020; Published online: September 1, 2020  Show citation

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ALTAF, M.A., SHAHID, R., REN, M.X., NAZ, S., ALTAF, M.M., QADIR, A., ... HAYAT, F. (2020). Exogenous melatonin enhances salt stress tolerance in tomato seedlings. Biologia plantarum, 64, Article 604-615. https://doi.org/10.32615/bp.2020.090
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