<p>Experiments were conducted to study the impact of boron (0, 10, 25 and 50 µM B) availability on growth and salt (100 mM NaCl) stress tolerance mechanisms in wheat. Seeds of wheat were sown in earthen pots containing washed sand. From the time of sowing, pots were saturated with 100 mL Hoagland nutrient solution containing 0, 10, 25 and 50 µM boron (B) every alternate day. Two weeks after germination, pots were subdivided into two groups to start the salt stress (NaCl, 100 mM) for twenty-five days. Salinity reduced plant height, plant weight, content of chlorophylls and carotenoids, and also caused a decline in net photosynthesis, intercellular CO₂ concentrations, stomatal conductance, transpiration and Rubisco activity. However, supplementation of boron alleviated the decline in growth and photosynthetic parameters. Boron reduced the oxidative stress parameters including hydrogen peroxide and lipid peroxidation significantly which were considerably increased by NaCl stress, and alleviated the decline in nitrate reductase activity. Content of ascorbate, reduced glutathione, total phenols and proline increased due to boron supplementation. Under salinity stress, boron supplementation caused further increase and decrease in the activity of γ-glutamyl kinase and proline oxidase respectively. Radical scavenging activity assayed as 2,2-Diphenyl-1-picrylhydrazyl (DPPH) 2,2′-azinobis (3-ethylbenzothiazoline-6-sulfonic acid (ABTS) radical scavenging was significantly higher in boron supplemented plants under normal and salt-stressed conditions. Boron increased nitrogen and potassium while decreasing sodium content. Up-regulated functioning of antioxidant system enzymes in boron-treated plants confirms its beneficial role in alleviating the NaCl-triggered oxidative damage.</p>