Exogenous Application of Nitric Oxide Mitigates Water Stress and Reduces Natural Viral Disease Incidence of Tomato Plants Subjected to Deficit Irrigation

The present work reveals the beneficial role of sodium nitroprusside (SNP; NO donor concentration: 50 and 100 µM) in mitigation water stress accompanied by a reduction viral disease incidence tomato plants subjected to deficit irrigation. were grown under two irrigation regimes: well-watered (WW; irrigated after depletion 55–60% available soil water) (WD; 85–90% seasons 2018 2019. results indicated that conditions, plant growth, chlorophyll, relative content (RWC), fruit yield decreased. Conversely, significantly increased MDA, proline, soluble sugars, antioxidant enzymes’ activities. Moreover, it was obvious negligible increase from NO2 NO3. Water-deficit stress, however, had positive impact on reducing percentage (TMV TYLCV) plants. Similarly, SNP application form foliar spray reduced incidence, severity, concentrations TMV TYLCV raised both WW WD conditions. treatment at µM achieved better could be recommended induce tolerance stress. Thus, highlights (SNP) alleviation subsequent during