脱落酸调节植物铁代谢的研究进展

Regulation of plant iron homeostasis by abscisic acid: a review

摘要:

铁(Fe)是重要的微量元素，参与植物的许多重要生理和代谢过程如光合作用、呼吸作用和氮代谢等。植物通过对铁的吸收、转运、贮存、再分配来维持体内的铁稳态。植物体的铁代谢受到严格的调控。铁调节转录因子和铁转运蛋白构成了植物吸收、运输铁的调控网络，贮铁蛋白和铁转运蛋白共同调节植物高铁反应。近年来，脱落酸(abscisic acid,ABA)参与调节植物铁代谢的研究取得了重要进展。ABA可能作为信号调节Fe的吸收、运输和再利用环节，或通过调节植物体内氧化应激状态缓解植物的铁胁迫症状。为了加深对植物体ABA与铁代谢串扰的理解，本文从植物的铁吸收转运机制和代谢调控网络、ABA参与植物铁代谢及其介导的铁代谢调控机制等方面进行了综述。重点讨论了ABA与FER样缺铁诱导转录因子(FER-like iron deficiency-induced transcription factor,FIT)、铁调转运蛋白1(iron-regulated transporter 1,IRT1)以及缺铁氧化应激之间的关系，并对未来的研究方向进行了展望。

Abstract:

Iron (Fe) is an important trace element involved in many important plant physiological and metabolic processes such as photosynthesis, respiration and nitrogen metabolism. Plants maintain iron homeostasis through absorption, transporting, storage and redistribution of iron. Iron metabolism is strictly regulated in plants. Iron regulatory transcription factors and iron transporters constitute the regulatory network of plant iron absorption and transport in plants. Ferritin and iron transporter jointly regulate the response to excess iron in plants. In recent years, important progress has been made in understanding how abscisic acid (ABA) regulates iron metabolism in plants. ABA may be used as a signal to regulate the absorption, transportation and reuse of Fe, or to relieve the symptoms of iron stress by regulating the oxidative stress responses in plants. In order to gain deeper insights into the crosstalk of ABA and iron metabolism in plants, this review summarized the mechanisms of iron absorption and transport and metabolic regulatory network in plants, as well as the mechanisms of ABA in regulating iron metabolism. The relationship between ABA and FER-like iron deficiency-induced transcription factor (FIT), iron-regulated transporter 1 (IRT1), and oxidative stress of iron deficiency were highlighted, and future research directions were prospected.