Salt stress is known to be momentous abiotic stress which treats agricultural lands and crop production throughout the world and effects the system of food security. The current study aims to investigate the effect of foliar application of 10 mg/l of zinc oxide (ZnO) as a bulk or as a green synthesized nanoparticle (ZnO-NPs) which were hexagonal and spherical in shape and at size 16–35 nm to alleviate the impact of salinity concentrations (0, 10, 25, 50, 75 and 100% SW) on Okra (Abelmoschus esculentus L. Moench cv. Hasawi) species. The results demonstrated a gradual decrease in the photosynthetic pigments (i.e., chlorophyll a and b with total chlorophylls and carotenoids) with the growth of salinity conc. However, the sea water levels between 0 and 75% will led to increase in proline, total soluble sugar and activity of the antioxidant enzymes i.e., superoxide dismutase (SOD) and catalase (CAT) and then decrease at 100% SW. The addition of bulk ZnO or ZnO-NPs enhances the contents of the photosynthetic pigments, activity of both SOD and CAT and then lowers the accumulation of proline and total soluble sugar when equated with controls. Plants treated with ZnO-NPs showed the greatest results when compared with other treatments. The results of current study showed ZnO-NPs as an appropriate eco-friendly and low-cost application for plant growth under salinity which has an ability to moderate the salt stress effect of plants.

众所周知，盐胁迫是一种严重的非生物胁迫，它影响着世界各地的农田和农作物生产，并影响粮食安全系统。本研究旨在研究叶面施用 10 毫克/升氧化锌 (ZnO) 的效果，无论是散装还是绿色合成纳米粒子 (ZnO-NPs)，其形状为六角形和球形，尺寸为 16-35 nm以减轻盐度浓度（0、10、25、50、75 和 100% SW）对黄秋葵 ( Abelmoschus esculentus L. Moench cv. Hasawi) 物种的影响。结果表明，随着盐度浓度的增加，光合色素（即叶绿素a和b以及总叶绿素和类胡萝卜素）逐渐减少。然而，海水水位在0%至75%之间将导致脯氨酸、总可溶性糖和抗氧化酶（即超氧化物歧化酶（SOD）和过氧化氢酶（CAT））的活性增加，然后在100%SW时降低。与对照相比，添加大量 ZnO 或 ZnO-NP 可提高光合色素的含量、SOD 和 CAT 的活性，然后降低脯氨酸和总可溶性糖的积累。与其他处理相比，用 ZnO-NPs 处理的植物表现出最好的效果。目前的研究结果表明，ZnO-NPs是一种适合盐分条件下植物生长的生态友好且低成本的应用，能够缓解植物的盐胁迫效应。