Trofimov Ksenia, Mankotia Samriti, Ngigi Mary, Baby Dibin, Satbhai Santosh B, Bauer Petra
Institute of Botany, Heinrich-Heine-University, D-40225 Düsseldorf, Germany.
Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Mohali, SAS Nagar, Punjab 140406, India.
J Exp Bot. 2025 Feb 7;76(3):787-802. doi: 10.1093/jxb/erae324.
In the dynamic environment of plants, the interplay between light-dependent growth and iron nutrition is a recurring challenge. Plants respond to low iron levels by adjusting growth and physiology through enhanced iron acquisition from the rhizosphere and internal iron pool reallocation. Iron deficiency response assays and gene co-expression networks aid in documenting physiological reactions and unraveling gene-regulatory cascades, offering insight into the interplay between hormonal and external signaling pathways. However, research directly exploring the significance of light in iron nutrition remains limited. This review provides an overview on iron deficiency regulation and its cross-connection with distinct light signals, focusing on transcription factor cascades and long-distance signaling. The circadian clock and retrograde signaling influence iron uptake and allocation. The light-activated shoot-to-root mobile transcription factor ELONGATED HYPOCOTYL5 (HY5) affects iron homeostasis responses in roots. Blue light triggers the formation of biomolecular condensates containing iron deficiency-induced protein complexes. The potential of exploiting the connection between light and iron signaling remains underutilized. With climate change and soil alkalinity on the rise, there is a need to develop crops with improved nutrient use efficiency and modified light dependencies. More research is needed to understand and leverage the interplay between light signaling and iron nutrition.
在植物的动态环境中，光依赖型生长与铁营养之间的相互作用是一个反复出现的挑战。植物通过增强从根际获取铁和重新分配内部铁库来调节生长和生理，从而对低铁水平做出反应。缺铁反应测定和基因共表达网络有助于记录生理反应和揭示基因调控级联反应，从而深入了解激素信号通路和外部信号通路之间的相互作用。然而，直接探索光在铁营养中的重要性的研究仍然有限。本综述概述了缺铁调控及其与不同光信号的交叉联系，重点关注转录因子级联反应和长距离信号传导。生物钟和逆行信号影响铁的吸收和分配。光激活的从地上部到根部移动的转录因子长胚轴5（HY5）影响根中的铁稳态反应。蓝光触发含有缺铁诱导蛋白复合物的生物分子凝聚物的形成。利用光信号与铁信号之间联系的潜力仍未得到充分利用。随着气候变化和土壤碱化加剧，需要培育养分利用效率提高且光依赖性改变的作物。需要更多研究来理解和利用光信号与铁营养之间的相互作用。
