褪黑素提高小麦耐逆性中对光合效率和减轻胁迫的作用的元分析。

A meta-analysis of photosynthetic efficiency and stress mitigation by melatonin in enhancing wheat tolerance.

机构信息

Guangxi Key Laboratory of Forest Ecology and Conservation, State Key Laboratory for Conservation and Utilization of Agro-bioresources, College of Forestry, Guangxi University, 100 Daxue Rd., Xixiangtang District, Nanning, Guangxi, 530004, China.

Department of Plant Breading and Genetics, The University of Agriculture Swat, Swat, Pakistan.

出版信息

BMC Plant Biol. 2024 May 21;24(1):427. doi: 10.1186/s12870-024-05132-2.

DOI:10.1186/s12870-024-05132-2

PMID:38769501

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11106942/

Abstract

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 CO 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.

摘要

背景

我们的荟萃分析考察了褪黑素在不同非生物胁迫条件下对小麦的影响，重点关注光合作用参数、叶绿素荧光、叶片水分状态和光合色素。我们最初收集了 177 篇关于褪黑素对小麦影响的出版物。经过细致筛选，选择了 31 篇已发表的研究，其中包括 170 个关于光合作用参数的观察结果、73 个关于叶绿素荧光的观察结果、65 个关于叶片水分状态的观察结果、240 个关于光合色素的观察结果。

结果

分析表明，上述参数的研究存在显著的异质性（I²＞99.90%），并且存在出版偏倚的证据，强调了褪黑素应用与植物生理响应之间的复杂相互作用。与对照（无褪黑素）相比，褪黑素分别提高了光合作用速率、气孔导度、蒸腾速率和荧光产量的综合响应比（lnRR）20.49%、22.39%、30.96%和 1.09%。在受控环境条件下，效果最为显著。此外，褪黑素显著提高了叶片水分含量并降低了水势，尤其是在水培条件下和各种非生物胁迫下，凸显了其缓解水分胁迫的作用。分析还表明，土壤淋洗和叶面喷雾均可增加叶绿素色素，这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，表明其具有优化光合作用效率的能力。

结论

荟萃分析的综合结果证实，褪黑素通过改善光合作用参数、叶绿素荧光、叶片水分状态和光合色素，显著增强了小麦对非生物胁迫的适应能力。尽管存在异质性和出版偏倚，但褪黑素的一致有益作用，特别是在具有特定应用方法（如土壤淋洗和叶面喷雾）的受控条件下，表明其作为一种植物生长调节剂在应对胁迫方面具有实用性。这些发现鼓励进行有针对性的研究和应用策略，以最大程度地发挥褪黑素在小麦种植中的益处，从而促进可持续农业实践。