Water stress is the most common abiotic environmental factor that influenced the morphological and physiological traits of the plants. Application of antitranspirants substances such as chitosan can reduce water loss. Summer savory (Satureja hortensis L.) is one of the important medicinal and aromatic plants which is used in food and pharmaceutical industries. In this investigation, the response of summer savory to foliar application chitosan (acetic acid, 0, 0.5, 1 and 2 g/L) under three irrigation regimes (30, 60, and 90 % field capacity (FC), as a pot factorial experiment in randomized complete design with three replications, was evaluated. Chitosan and irrigation regimes treatments had significant effects on studied parameters, including biomass, dry matter, essential oil content, and composition as well as selected physiological characteristics comprising photosynthetic pigments, osmotic adjustment, total phenolic content, and antioxidant activities of the extract of summer savory. The results showed that chitosan application was useful under severe water stress (30 % FC) and 2 g/L of chitosan improved total phenolic, total soluble sugar and proline contents, antioxidant activity, and essential oil content of the plant. Elicitation of summer savory with chitosan under water stress modified essential oil compositions such as carvacrol, γ-terpinene, and p-cymene. In conclusion, the findings of the present experiment indicated that chitosan could be a favorable material used to decrease the deleterious effect of water stress. Furthermore, the chitosan spraying can behave beneficial effects on the essential oil quality and quantity as well as osmotic adjustment, antioxidant activity, and growth of summer savory under water stress conditions.

水分胁迫是影响植物形态和生理特性的最常见的非生物环境因素。使用止汗剂物质如壳聚糖可以减少水分流失。夏季咸味（Satureja hortensisL.）是重要的药用和芳香植物之一，用于食品和制药行业。在这项调查中，夏季咸味对三种灌溉方式（30％，60％和90％的田间持水量（FC））下叶面施用壳聚糖（乙酸，0、0.5、1和2 g / L）的响应评估了随机完整设计的三重复实验，壳聚糖和灌溉制度处理对所研究的参数有显着影响，这些参数包括生物量，干物质，精油含量和组成以及选定的包括光合色素，渗透调节，总和的生理特性。夏季咸味提取物中的酚含量和抗氧化活性。结果表明，壳聚糖的施用在严重的水分胁迫下（30％FC）是有用的，并且2 g / L的壳聚糖改善了植物的总酚，总可溶性糖和脯氨酸含量，抗氧化活性和精油含量。在水分胁迫下用脱乙酰壳多糖激发夏天的咸味，以修饰香精油成分，例如香芹酚，γ-萜品烯和对伞花烃。总之，本实验的结果表明，壳聚糖可能是用于减少水分胁迫的有害作用的有利材料。此外，壳聚糖喷洒可对精油的质量和数量以及渗透调节，抗氧化活性和水分胁迫条件下的夏季咸味的生长产生有益的影响。