Beyond Survival: The Role of Secondary Metabolites in Plant Defense Mechanisms
摘要
Plants, over millennia, have evolved intricate and sophisticated defense mechanisms to counter a myriad of environmental stresses, primarily through the synthesis of secondary metabolites (SMs). These unique compounds are instrumental in plant defense acting as a frontline barrier against pathogens, pests, and herbivores, while also facilitating as well as aiding adaptation to environmental challenges and mediating interactions with other organisms. This review discusses the role of SMs in plant defense against pathogens and herbivores, as well as their significant contribution to abiotic stress tolerance. Furthermore, the review examines the impact of individual environmental variables, namely salinity, drought, temperature, and light, on the accumulation of SMs in plants. It also explores the intricate genetic regulation of SM biosynthesis during stress conditions, with a particular focus on the involvement of transcription factors, such as AP2/ERF, bZIP, bHLH, WRKY, MYB, and NAC. By integrating and synthesizing insights on both biotic and abiotic stress responses, this review sheds light on the complex interplay between environmental factors and secondary metabolite production, offering a comprehensive and holistic perspective on plant adaptive strategies.