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 and Keiichi Mochida ()
Additional contact information
Anzu Minami: RIKEN Center for Sustainable Resource Science
Yoshihiko Onda: RIKEN Center for Sustainable Resource Science
Minami Shimizu: RIKEN Center for Sustainable Resource Science
Yukiko Uehara-Yamaguchi: RIKEN Center for Sustainable Resource Science
Asaka Kanatani: RIKEN Center for Sustainable Resource Science
Risa Nakayama: RIKEN Center for Sustainable Resource Science
Kyoko Toyama: RIKEN Center for Sustainable Resource Science
Kotaro Takahagi: RIKEN Center for Sustainable Resource Science
Komaki Inoue: RIKEN Center for Sustainable Resource Science
Tomoko Nozoye: Meiji Gakuin University
Motofumi Suzuki: Aichi Steel Corporation
Yusuke Kouzai: RIKEN Center for Sustainable Resource Science
Toshihisa Nomura: RIKEN Center for Sustainable Resource Science
Keitaro Tanoi: The University of Tokyo
Masaki Endo: National Agriculture and Food Research Organization
Ryuji Miki: Kaneka Co. Ltd
Masakazu Kashihara: Kaneka Co. Ltd
Naoaki Taoka: Kaneka Co. Ltd
Keiichi Mochida: RIKEN Center for Sustainable Resource Science

Nature Communications, 2025, vol. 16, issue 1, 1-15

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-025-63005-0

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