Melatonin (MT) has been reported to regulate certain plant physiological processes and promote tolerance to different environmental stresses such as salinity. Green bean (Phaseolus vulgaris L. cv. Royal Nel) seedlings were exposed to 200 mM NaCl with or without pre‐treatment with 150 μM MT. Salt stress led to a lower chlorophyll content, a reduced photosynthetic activity, increased reactive oxygen species (ROS) contents, and decreased photosystem II (PSII) activity. The application of exogenous MT to green bean seedlings under salt stress improved photosynthetic activity and alleviated the oxidative damages by enhancing the activity of antioxidant enzymes. The expression of catalase (CAT1), glutathione reductase (GR), superoxide dismutase (CuZnSOD1), ascorbate peroxidase (APX), Peroxiredoxin Q (PrxQ), and 2‐cysteine peroxiredoxin (2‐Cys‐Prx) encoding genes was significantly increased under salt stress in green bean seedling compared with the untreated control. However, plants treated with exogenous MT and NaCl had 28.8, 21.1, 26.1, 20, 26.2, and 22.4% higher CuZnSOD, CAT1, APX, GR, PrxQ, and 2‐Cys‐Prx transcript levels, respectively, compared to NaCl stress alone. Our study revealed the protective mechanisms mediated by exogenous MT application in NaCl stress alleviation and our findings could be used in the management of green bean cultivation in salinity‐prone soils.

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Portal hypertension and its complications are the leading causes of morbidity and mortality in patients with liver cirrhosis. Noninvasive assessment of liver stiffness had been an effective tool for assessment of fibrosis progression in chronic liver disease. It was intended to assess liver stiffness measurement (LSM), portal vein diameter (PVD), splenic bipolar diameter (SD), and the platelet count/spleen diameter (PC/SD) ratio in patients who test positive for the hepatitis C virus (HCV) and to study the impact of non-selective beta blockers (NSBB) on the grade of esophageal varices (EVs) and liver elasticity. Subjects were 80 patients with Child-Pugh grade A or B compensated cirrhosis who tested positive for HCV. All of the patients underwent a laboratory workup including AFP, HCV antibodies, HCV RNA, HBsAg, LSM according to real-time elastography, upper gastrointestinal endoscopy (UGIE) to detect and grade EVs, calculation of the PC/SD ratio, and measurement of the PVD and SD according to real-time abdominal ultrasonography. All patients were given the maximum tolerated dose of NSBB for three months, and UGIE, LSM, PC/SD, PVD, and SD were subsequently reassessed and reported. LSM and the PC/SD ratio were exceptional noninvasive tools for prediction of significant EVs (grade ≥ II, p < 0.001) with a sensitivity 82.4% and a specificity 82.6% at a cutoff point 18 kPa for LSM, and a sensitivity 94.1% and specificity 69.6% at a cutoff point 880 for the PC/SD ratio. LSM is highly correlated with PVD, the PC/SD ratio, SD, and the Child-Pugh score. NSBB significantly decreased PVD. The percent change in PVD significantly correlated with LSM, the grade of EVs, and SD. Findings indicated that LSM is a noninvasive, rapid, and reproducible tool with which to detect portal hypertension and EVs. NSBB therapy can effectively decrease PVD and may consequently improve the EV grade with no significant impact on LSM in patients with liver cirrhosis.