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SPL转录因子在植物逆境胁迫应答中的分子机制
Molecular mechanisms of SPL transcription factors in plant stress responses
SPL(SQUAMOSA promoter binding protein-like)是植物特有的一类重要转录因子,广泛参与植物生长发育、代谢调控及逆境响应等生物学过程。近年来,SPL基因家族在植物逆境胁迫响应中的功能研究取得了显著进展。笔者系统梳理和总结SPL转录因子在植物响应非生物胁迫(如干旱、盐碱、重金属及温度胁迫等)和生物胁迫(如病原菌和虫害)中的调控作用及分子机制。在非生物胁迫中,SPL基因通过调控活性氧稳态(如OsSPL14-SNAC1通路)、蜡质合成(如AtSPL13-CER1)、离子平衡(如AtSPL7-miR398级联)及冷响应通路(如AtSPL9-CBF2)等途径增强植物适应性;在生物胁迫中,SPL成员(如OsSPL10-JAmyb、AtSPL6-RPS4)通过协调激素信号(JA/SA)和免疫反应调控抗病性与抗虫性。此外,还探讨SPL基因在作物抗逆遗传改良中的潜在应用价值,并针对木本植物中SPL功能研究的不足,提出未来应加强比较功能分析和进化机制探索的建议。本研究可为解析木本植物和草本非模式植物SPL基因响应逆境胁迫的调控通路提供线索,同时为深入理解SPL转录因子的功能多样性及其在分子育种中的应用提供理论依据。
SPL (SQUAMOSA promoter binding protein-like) proteins are a class of plant-specific transcription factors that play essential roles in a wide range of biological processes, including plant growth and development, phase transition, metabolic regulation, and responses to environmental stimuli. In recent years, with the rapid development of functional genomics and molecular biology techniques, significant progress has been achieved in elucidating the functions of SPL genes, particularly in plant stress responses. However, a comprehensive understanding of their regulatory mechanisms under diverse stress conditions remains incomplete. This review systematically summarizes the regulatory roles and molecular mechanisms of SPL transcription factors in plant responses to both abiotic and biotic stresses. Under abiotic stress conditions, SPL genes enhance plant adaptability through multiple regulatory pathways. These include the modulation of reactive oxygen species (ROS) homeostasis (e.g. the OsSPL14-SNAC1 pathway), regulation of cuticular wax biosynthesis (e.g. AtSPL13-CER1), maintenance of ion homeostasis (e.g. the AtSPL7-miR398 cascade), and participation in cold response signaling (e.g. AtSPL9-CBF2). Through these pathways, SPL transcription factors coordinate physiological and biochemical processes to improve plant tolerance to drought, salinity, heavy metal stress, and low-temperature conditions. In response to biotic stress, SPL members function as key regulators of plant immunity against pathogens and insect pests. They modulate disease resistance by integrating hormone signaling pathways, particularly jasmonic acid (JA) and salicylic acid (SA), and by regulating downstream defense-related genes. For example, OsSPL10-JAmyb and AtSPL6-RPS4 regulatory modules play important roles in coordinating immune responses and enhancing resistance. In addition, SPL genes are involved in the regulation of secondary metabolism, which contributes to plant defense. Furthermore, this review discusses the potential applications of SPL genes in crop genetic improvement, particularly in enhancing stress resistance, optimizing plant architecture, and improving yield stability through genetic engineering and genome editing approaches. Considering limited studies on SPL gene functions in woody plants, future research should focus on comparative functional analyses and the exploration of evolutionary mechanisms, including gene duplication and functional divergence. Overall, this review provides a comprehensive overview of SPL transcription factors in plant stress responses, offering insights into their regulatory networks and functional diversity, and providing a theoretical basis for their application in molecular breeding of stress-resistant plants.
SQUAMOSA promoter binding protein-like(SPL) transcription factor / abiotic stress / biotic stress / molecular mechanism
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