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- W4313277721 abstract "ABSTRACT Inorganic phosphate (Pi) is often limited in soils due to precipitation with iron (Fe) and aluminum (Al). To scavenge heterogeneously distributed phosphorus (P) resources, plants have evolved a local Pi signaling pathway that induces malate secretion to solubilize the occluded Fe‐P or Al‐P oxides. In this study, we show that Pi limitation impaired brassinosteroid signaling and downregulated BRASSINAZOLE‐RESISTANT 1 ( BZR1 ) expression in Arabidopsis thaliana . Exogenous 2,4‐epibrassinolide treatment or constitutive activation of BZR1 (in the bzr1‐D mutant) significantly reduced primary root growth inhibition under Pi‐starvation conditions by downregulating ALUMINUM‐ACTIVATED MALATE TRANSPORTER 1 ( ALMT1 ) expression and malate secretion. Furthermore, AtBZR1 competitively suppressed the activator effect of SENSITIVITY TO PROTON RHIZOTOXICITY 1 (STOP1) on ALMT1 expression and malate secretion in Nicotiana benthamiana leaves and Arabidopsis . The ratio of nuclear‐localized STOP1 and BZR1 determined ALMT1 expression and malate secretion in Arabidopsis . In addition, BZR1‐inhibited malate secretion is conserved in rice ( Oryza sativa ). Our findings provide insight into plant mechanisms for optimizing the secretion of malate, an important carbon resource, to adapt to Pi‐deficiency stress." @default.
- W4313277721 created "2023-01-06" @default.
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- W4313277721 date "2023-02-10" @default.
- W4313277721 modified "2023-10-15" @default.
- W4313277721 title "Brassinosteroid signaling regulates phosphate starvation‐induced malate secretion in plants" @default.
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- W4313277721 doi "https://doi.org/10.1111/jipb.13443" @default.
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