Salicylic Acid and α-Tocopherol Ameliorate Salinity Impact on Wheat

作者：Saleha Saeed, Abd Ullah, Sami Ullah, Mohamed S. Elshikh, Javaria Noor, Sayed M. Eldin, Fanjiang Zeng, Fazal Amin, M. Ajmal Ali, Iftikhar Ali · 发表于：ACS Omega · 年份：2023 · DOI：10.1021/acsomega.3c02166 · 被引用次数：18 · 研究领域：Plant Stress Responses and Tolerance、Photosynthetic Processes and Mechanisms、Plant responses to elevated CO2

High Resolution Image Download MS PowerPoint Slide Background: Soil salinity negatively impacts agricultural productivity. Consequently, strategies should be developed to inculcate a salinity tolerance in crops for sustainable food production. Growth regulators play a vital role in regulating salinity stress tolerance. Methods: Thus, we examined the effect of exogenous salicylic acid (SA) and alpha-tocopherol (TP) (100 mg/L) on the morphophysio-biochemical responses of two wheat cultivars (Pirsabak-15 and Shankar) to salinity stress (0 and 40 mM). Results: Both Pirsabak-15 and Shankar cultivars were negatively affected by salinity stress. For instance, salinity reduced growth attributes (i.e., leaf fresh and dry weight, leaf moisture content, leaf area ratio, shoot and root dry weight, shoot and root length, as well as root–shoot ratio), pigments (chlorophyll a, chlorophyll a, and carotenoids) but increased hydrogen peroxide (H 2 O 2 ), malondialdehyde (MDA), and endogenous TP in both cultivars. Among the antioxidant enzymes, salinity enhanced the activity of peroxidase (POD) and polyphenol oxidase (PPO) in Pirsabak-15; glutathione reductase (GR) and PPO in Shankar, while ascorbate peroxidase (APOX) was present in both cultivars. SA and TP could improve the salinity tolerance by improving growth and photosynthetic pigments and reducing MDA and H 2 O 2 . In general, the exogenous application did not have a positive effect on antioxidant enzymes; however, it increased PPO in Pi...