| Autor: |
Alnusairi GSH; Department of Biology, College of Science, Jouf University, Sakaka 72388, Saudi Arabia., Mazrou YSA; Business Administration Department, Community College, King Khalid University, Guraiger, Abha 62529, Saudi Arabia.; Faculty of Agriculture, Tanta University, Tanta 31512, Egypt., Qari SH; Biology Department, Al-Jumum University College, Umm Al-Qura University, Mecca 21955, Saudi Arabia., Elkelish AA; Botany Department, Faculty of Science, Suez Canal University Ismailia, Ismailia 41522, Egypt., Soliman MH; Botany and Microbiology Department, Faculty of Science, Cairo University, Giza 12613, Egypt., Eweis M; Botany and Microbiology Department, Faculty of Science, Cairo University, Giza 12613, Egypt., Abdelaal K; Plant Pathology and Biotechnology Laboratory, Excellence Center (EPCRS), Faculty of Agriculture, Kafrelsheikh University, Kafr Elsheikh 33516, Egypt., El-Samad GA; Department of Agronomy, Faculty of Agriculture, Ain Shams University, Cairo 11566, Egypt., Ibrahim MFM; Department of Agricultural Botany, Faculty of Agriculture, Ain Shams University, Cairo 11566, Egypt., ElNahhas N; Department of Botany and Microbiology, Faculty of Science, Alexandria University, Alexandria 21526, Egypt. |
| Abstrakt: |
Salinity stress is one of the major environmental constraints responsible for a reduction in agricultural productivity. This study investigated the effect of exogenously applied nitric oxide (NO) (50 μM and 100 μM) in protecting wheat plants from NaCl-induced oxidative damage by modulating protective mechanisms, including osmolyte accumulation and the antioxidant system. Exogenously sourced NO proved effective in ameliorating the deleterious effects of salinity on the growth parameters studied. NO was beneficial in improving the photosynthetic efficiency, stomatal conductance, and chlorophyll content in normal and NaCl-treated wheat plants. Moreover, NO-treated plants maintained a greater accumulation of proline and soluble sugars, leading to higher relative water content maintenance. Exogenous-sourced NO at both concentrations up-regulated the antioxidant system for averting the NaCl-mediated oxidative damage on membranes. The activity of antioxidant enzymes increased the protection of membrane structural and functional integrity and photosynthetic efficiency. NO application imparted a marked effect on uptake of key mineral elements such as nitrogen (N), potassium (K), and calcium (Ca) with a concomitant reduction in the deleterious ions such as Na + . Greater K and reduced Na uptake in NO-treated plants lead to a considerable decline in the Na/K ratio. Enhancing of salt tolerance by NO was concomitant with an obvious down-regulation in the relative expression of SOS1, NHX1, AQP, and OSM-34, while D2-protein was up-regulated. |
