背景:我们的荟萃分析研究了不同非生物胁迫条件下褪黑激素对小麦的影响,专注于光合参数,叶绿素荧光,叶片水分状况,和光合色素。我们最初收集了177种出版物,讨论褪黑激素对小麦的影响。经过精心筛选,选择了31项已发表的研究,包括170个关于光合参数的观测,73对叶绿素荧光,65叶水状况,240对光合色素。
结果:分析显示,上述参数和发表偏倚的证据存在显著的异质性(I²>99.90%),强调褪黑激素应用与植物生理反应之间的复杂相互作用。褪黑素提高了光合速率的总反应比(lnRR),气孔导度,蒸腾速率,荧光产量分别为20.49、22.39、30.96和1.09%,分别,与对照组(无褪黑激素)相比。最显着的影响是在受控的环境条件下。此外,褪黑素显著提高了叶片含水量,降低了水势,特别是在水培条件和各种非生物胁迫下,强调其在缓解水压力方面的作用。分析还显示,随着土壤浸透和叶面喷雾,叶绿素色素增加,这些被认为是有效的应用方法。此外,褪黑素影响叶绿素SPAD和胞间CO2浓度,表明其优化光合效率的能力。
结论:这种荟萃分析的合成证实,褪黑激素通过改善光合参数显着增强小麦对非生物胁迫的抵抗力,叶绿素荧光,叶片水分状况,和光合色素。尽管观察到异质性和发表偏倚,褪黑激素的一致有益作用,特别是在具有特定应用方法的受控条件下,例如土壤浸透和叶面喷雾,证明其作为植物生长调节剂用于压力管理的效用。这些发现鼓励重点研究和应用策略,以最大限度地发挥褪黑激素在小麦种植中的作用。从而促进可持续农业实践。
BACKGROUND: Our meta-analysis examines the effects of melatonin on wheat under varying abiotic stress conditions, focusing on photosynthetic parameters, chlorophyll fluorescence, leaf water status, and photosynthetic pigments. We initially collected 177 publications addressing the impact of melatonin on wheat. After meticulous screening, 31 published studies were selected, encompassing 170 observations on photosynthetic parameters, 73 on chlorophyll fluorescence, 65 on leaf water status, 240 on photosynthetic pigments.
RESULTS: The analysis revealed significant heterogeneity across studies (I² > 99.90%) for the aforementioned parameters and evidence of publication bias, emphasizing the complex interaction between melatonin application and plant physiological responses. Melatonin enhanced the overall response ratio (lnRR) for photosynthetic rates, stomatal conductance, transpiration rates, and fluorescence yields by 20.49, 22.39, 30.96, and 1.09%, respectively, compared to the control (no melatonin). The most notable effects were under controlled environmental conditions. Moreover, melatonin significantly improved leaf water content and reduced water potential, particularly under hydroponic conditions and varied abiotic stresses, highlighting its role in mitigating water stress. The analysis also revealed increases in chlorophyll pigments with soil drenching and foliar spray, and these were considered the effective application methods. Furthermore, melatonin influenced chlorophyll SPAD and intercellular CO2 concentrations, suggesting its capacity to optimize photosynthetic efficiency.
CONCLUSIONS: This synthesis of meta-analysis confirms that melatonin significantly enhances wheat\'s resilience to abiotic stress by improving photosynthetic parameters, chlorophyll fluorescence, leaf water status, and photosynthetic pigments. Despite observed heterogeneity and publication bias, the consistent beneficial effects of melatonin, particularly under controlled conditions with specific application methods e.g. soil drenching and foliar spray, demonstrate its utility as a plant growth regulator for stress management. These findings encourage focused research and application strategies to maximize the benefits of melatonin in wheat farming, and thus contributing to sustainable agricultural practices.