Effects of tea polyphenols on the activities of antioxidant enzymes and the expression of related gene in the leaves of wheat seedlings under salt stress

• Published in: Environmental science and pollution research international Vol. 28; no. 46; pp. 65447 - 65461
• Main Authors: Zhang, Ya, Li, Guiying, Si, Lianbang, Liu, Na, Gao, Tianpeng, Yang, Yingli
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-12-2021; Springer Nature B.V
• Subjects: Accumulation; Antioxidants; Antioxidants - metabolism; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Calcium ions; Catalase; Damage accumulation; Diamines; Earth and Environmental Science; Ecotoxicology; Electrical conductivity; Electrical resistivity; Environment; Environmental Chemistry; Environmental Health; Environmental science; Gene expression; Hydrogen Peroxide; Leaves; Malondialdehyde; New varieties; Oxidase; Oxidative Stress; Peroxidase; Plant Leaves - metabolism; Polyamine oxidase; Polyamines; Polyphenols; Polyphenols - pharmacology; Potassium; Reactive oxygen species; Reduction; Research Article; Salinity; Salinity effects; Salt; Salt Stress; Salts; Seedlings; Seedlings - metabolism; Sodium chloride; Superoxide dismutase; Tea; Triticum - genetics; Triticum - metabolism; Waste Water Technology; Water Management; Water Pollution Control; Wheat; Ion balance; Tea polyphenols; Salt stress; Gene expression; Wheat; Antioxidant enzymes
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-021-15492-z

Longchun 30, a new wheat variety, was used to investigate seedling growth, element absorption, and antioxidant response under 150 mM NaCl and tea polyphenols (TP) (25 and 100 mg L
−1
) treatments alone or in combination, thus revealing TP-alleviating mechanism on the salt damage to plants. 150 mM NaCl stress alone inhibited the seedling growth, increased sodium content and reactive oxygen species (ROS) accumulation, but reduced potassium (K) and calcium (Ca) levels at different culture times, thus resulting in the oxidative damage to the leaves. Even though 25 or 100 mg L
−1
TP treatment alone led to the significant increases of O
2
·
−
and H
2
O
2
generation, TP-treated leaves exhibited the reduction of relative electrical conductivity and no change of malondialdehyde content. Moreover, high TP concentration alone stimulated the seedling growth. In addition, the activities and gene expression of superoxide dismutase, catalase, and peroxidase (POD) as well as diamine oxidase and polyamine oxidase were changed to different degrees due to NaCl or TP treatment alone. Further study showed that the presence of 25 or 100 mg L
−1
TP promoted the growth, increased K
+
and Ca
2+
contents, and reduced O
2
·
−
and H
2
O
2
accumulation in salt-stressed wheat seedlings. Taken together, salinity-inhibitory effect on the growth of wheat seedlings might be associated with salt-induced imbalance of element content and the increase of oxidative damage resulting from ROS accumulation, while the application of TP effectively alleviated salinity-inhibitory effect on the seedling growth and improved the tolerance of wheat seedlings to salt environment, which might be associated with the increases of K
+
and Ca
2+
contents as well as the reduction of oxidative damage in the leaves of wheat seedlings under NaCl and TP treatment in combination.