Liu Bingqi, Li Haimei, Zhao Xianhui, Wang Junrui, Zhang Yuting
College of Landscape Architecture and Forestry, Qingdao Agricultural University, Changcheng Road NO. 700, Qingdao 266109, China.
Plants (Basel). 2025 Aug 26;14(17):2661. doi: 10.3390/plants14172661.
Salt stress is a major abiotic factor that inhibits plant growth. Melatonin (MT), an important plant growth regulator, can effectively enhance plant stress resistance. , a turfgrass species widely used in urban landscaping, was selected for this study to evaluate the regulatory effects of exogenous MT at different concentrations on its growth and development under salt stress. Indoor pot experiments were conducted using as the plant material. The experiment included a 250 mM NaCl salt-stress treatment and foliar application of five MT concentrations (0 μM, 50 μM, 150 μM, 250 μM, and 350 μM) to assess their effects under salt stress. The results showed that salt stress severely inhibited the growth of , while all tested MT concentrations significantly alleviated the damage. MT treatments improved leaf area and plant height and increased relative water content, soluble protein, proline, chlorophyll, and carotenoid contents. Additionally, MT reduced malondialdehyde accumulation and enhanced superoxide dismutase and peroxidase activities. Among the tested concentrations, 150 μM MT showed the most effective alleviation of salt stress, indicating its strong potential for promoting cultivation in saline environments.
盐胁迫是抑制植物生长的主要非生物因素。褪黑素（MT）作为一种重要的植物生长调节剂，能够有效增强植物的抗逆性。本研究选用一种广泛应用于城市绿化的草坪草品种，来评估不同浓度外源MT对其在盐胁迫下生长发育的调控作用。以该草坪草品种作为植物材料进行室内盆栽试验。试验包括250 mM NaCl盐胁迫处理以及叶面喷施五种MT浓度（0 μM、50 μM、150 μM、250 μM和350 μM），以评估它们在盐胁迫下的效果。结果表明，盐胁迫严重抑制了该草坪草品种的生长，而所有测试的MT浓度均显著减轻了损害。MT处理提高了叶面积和株高，并增加了相对含水量、可溶性蛋白、脯氨酸、叶绿素和类胡萝卜素含量。此外，MT减少了丙二醛积累并增强了超氧化物歧化酶和过氧化物酶活性。在测试浓度中，150 μM MT对盐胁迫的缓解效果最为显著，表明其在促进盐渍环境中该草坪草品种种植方面具有强大潜力。
