2025-08-28 理化学研究所,横浜市立大学,長崎大学,明治学院大学,愛知製鋼株式会社,東京大学,農業・食品産業技術総合研究機構
イネ科植物の鉄吸収メカニズムとムギネ酸を介した温帯性草本植物の高温耐性適応機構
＜関連情報＞
- https://www.riken.jp/press/2025/20250828_3/index.html
- https://www.nature.com/articles/s41467-025-63005-0
キレート化に基づく鉄吸収は、冷涼期草における長期高温ストレスの影響を緩和する Chelation-based iron uptake mitigates the effects of prolonged high-temperature stress in cool-season grasses
Anzu Minami,Yoshihiko Onda,Minami Shimizu,Yukiko Uehara-Yamaguchi,Asaka Kanatani,Risa Nakayama,Kyoko Toyama,Kotaro Takahagi,Komaki Inoue,Tomoko Nozoye,Motofumi Suzuki,Yusuke Kouzai,Toshihisa Nomura,Keitaro Tanoi,Masaki Endo,Ryuji Miki,Masakazu Kashihara,Naoaki Taoka & Keiichi Mochida
Nature Communications Published:28 August 2025
DOI:https://doi.org/10.1038/s41467-025-63005-0
Abstract
High-temperature stress poses a significant threat to agricultural productivity and ecological diversity. Here, we show the effects of prolonged high-temperature stress on wheat (Triticum aestivum) and the model grass Brachypodium distachyon and demonstrate that heat stress induces iron deficiency in newly emerged leaves. Quantitative trait locus analysis of B. distachyon reveals a genomic region associated with heat resilience that includes the transporter of mugineic acid family phytosiderophores 1 gene (BdTOM1). Iron-deficiency-related genes including BdTOM1 are more highly expressed in a high-temperature-tolerant B. distachyon accession at high temperature than in a sensitive accession, resulting in greater secretion of deoxymugineic acid. Treatment with proline-2′-deoxymugineic acid mitigates heat-induced growth inhibition, but excess iron treatment leads to toxicity in both species. Our findings highlight the role of heat-induced nutritional stress in prolonged high-temperature stress and suggest that iron homeostasis could provide a promising target for improving crop resilience to climate extremes.
