Department of Biology, Factually of Basic Science, Lorestan University, Khorramabad, Iran.
Department of Plant Biology (Plant Physiology), Faculty of Biology, University of Murcia, 30100, Murcia, Spain.
Sci Rep. 2024 Oct 4;14(1):23148. doi: 10.1038/s41598-024-73885-9.
Water stress is one of the most significant abiotic stresses that disrupts the osmotic balance of plants and consequently reduces their growth and performance. In recent years, it has been found that serotonin, as a signaling and regulatory molecule, can play important roles in the growth and development of plants and enhance their tolerance to abiotic stresses. Saffron is a plant known for its medicinal and culinary properties. Its distinct flavor, aroma, and vibrant color make it a sought-after ingredient in various cuisines and traditional medicines. The aim of this study is to investigate the possible effect of serotonin growth regulator on some morphophysiological and biochemical characteristics of saffron plant under water stress conditions. Water stress was applied using polyethylene glycol 6000 at a level of 30%, w/v. Serotonin was also applied exogenously at a concentration of 100 µM in both foliar and root applications. The experimental findings demonstrated that water stress had a detrimental impact on various growth and photosynthetic parameters including FW, DW, SH, RWC, photosynthetic pigments content, Pn, Fv/Fm, C and Ci. Under these conditions, HO content and ion leakage increased. The increase in the content of proline and sugars also confirmed that the saffron plant was placed in unfavorable growth conditions. Serotonin application in both foliar and root applications and especially root treatment under stressful conditions improved plant growth by activating enzymatic and non-enzymatic antioxidant systems. Overall, the exogenous application of serotonin increased the resistance of saffron plants to water stress.
水分胁迫是一种重要的非生物胁迫，它破坏植物的渗透平衡，从而降低其生长和性能。近年来，人们发现 5-羟色胺作为一种信号和调节分子，可以在植物的生长和发育中发挥重要作用，并增强其对非生物胁迫的耐受性。藏红花是一种具有药用和烹饪价值的植物。它独特的风味、香气和鲜艳的颜色使其成为各种美食和传统药物中备受追捧的成分。本研究旨在探讨 5-羟色胺生长调节剂对水分胁迫条件下藏红花植株一些形态生理和生化特性的可能影响。通过使用聚乙二醇 6000将水分胁迫水平控制在 30%（w/v）。5-羟色胺也以 100µM 的浓度在叶面和根部应用两种方式进行外源施加。实验结果表明，水分胁迫对各种生长和光合参数产生了不利影响，包括 FW、DW、SH、RWC、光合色素含量、Pn、Fv/Fm、C 和 Ci。在这些条件下，HO 含量和离子渗漏增加。脯氨酸和糖含量的增加也证实了藏红花植物处于不利的生长条件下。在胁迫条件下，叶面和根部应用 5-羟色胺，特别是根部处理，通过激活酶和非酶抗氧化系统来改善植物生长。总的来说，外源施加 5-羟色胺可以提高藏红花植株对水分胁迫的抗性。
