Root- exuded specialized metabolites reduce arsenic toxicity in maize

• 成果类型: Article
• 署名作者: Caggia, Veronica; Waelchli, Jan; Deslandes-Herold, Gabriel; Mateo, Pierre; Robert, Christelle A. M.; Guan, Hang; Bigalke, Moritz; Spielvogel, Sandra; Mestrot, Adrien; Schlaeppi, Klaus; Erb, Matthias
• 署名单位: University of Bern; University of Basel; University of Bern; Technical University of Darmstadt; University of Kiel; Helmholtz Association; Research Center Julich
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-15406
• DOI: 10.1073/pnas.2314261121
• 发表日期: 2024-03-19
• 关键词: aluminum resistance; plant; phosphate; accumulation; acquisition; responses

摘要

By releasing specialized metabolites, plants modify their environment. Whether and how specialized metabolites protect plants against toxic levels of trace elements is not well understood. We evaluated whether benzoxazinoids, which are released into the soil by major cereals, can confer protection against arsenic toxicity. Benzoxazinoid-producing maize plants performed better in arsenic- contaminated soils than benzoxazinoid- deficient mutants in the greenhouse and the field. Adding benzoxazinoids to the soil restored the protective effect, and the effect persisted to the next crop generation via positive plant-soil feedback. Arsenate levels in the soil and total arsenic levels in the roots were lower in the presence of benzoxazinoids. Thus, the protective effect of benzoxazinoids is likely soil- mediated and includes changes in soil arsenic speciation and root accumulation. We conclude that exuded specialized metabolites can enhance protection against toxic trace elements via soil- mediated processes and may thereby stabilize crop productivity in polluted agroecosystems.