Journal
PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS
Volume -, Issue -, Pages -Publisher
SPRINGER
DOI: 10.1007/s12298-023-01357
Keywords
Salinity stress; Phenols; Proline; Protein profile; Antioxidant enzymes; Lipid peroxidation
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Salinity can negatively affect the growth and yield of flax plants, but the application of thiourea can mitigate these effects by acting as an antioxidant and growth regulator. Thiourea improved the growth, yield, and antioxidant defense mechanisms of flax plants under salt stress.
Salinity is one of the abiotic stress factors that affect plant physiology and cause various plant disorders. Thiourea, which consists of amino, thiol, and imino groups, is an antioxidant and growth regulator. The objective was to determine the antioxidant role of thiourea (0, 3, 6 mM) in attenuating the effects of salinity (0 mM, 50 mM, 100 mM NaCl) on growth, yield, and some biochemical compositions of flax (Linum usitatissimum L.) plants. Salt stress significantly reduced root and shoot length, root and shoot weight in dry and fresh matter, and yield components. In addition, salinity decreased photosynthetic pigments, total soluble sugar (TSS), and total free amino acids (TFAA) and suppressed ascorbate peroxidase (APX) and peroxidase (POX) activities, while proline and malondialdehyde (MDA) increased in stressed flax plants. Thiourea (TU) application improved all growth and yield characteristics of flax plants. TU increased photosynthetic pigment, APX, TSS, and TFAA while reducing proline and MDA. The differential accumulation of several proteins was reported under salt stress and TU-treatment. These proteins might be involved in the stress response and tolerance. Finally, foliar application of thiourea, especially at 6 mM, can counteract the effects of salinity on the growth and harvesting characteristics of flax plants by strengthening antioxidant defense mechanisms.
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