A transcription factor STOP1-centered pathway coordinates ammonium and phosphate acquisition in Arabidopsis.
Mol Plant
; 14(9): 1554-1568, 2021 09 06.
Article
em En
| MEDLINE
| ID: mdl-34216828
ABSTRACT
Phosphorus (P) is an indispensable macronutrient required for plant growth and development. Natural phosphate (Pi) reserves are finite, and a better understanding of Pi utilization by crops is therefore vital for worldwide food security. Ammonium has long been known to enhance Pi acquisition efficiency in agriculture; however, the molecular mechanisms coordinating Pi nutrition and ammonium remains unclear. Here, we reveal that ammonium is a novel initiator that stimulates the accumulation of a key regulatory protein, STOP1, in the nuclei of Arabidopsis root cells under Pi deficiency. We show that Pi deficiency promotes ammonium uptake mediated by AMT1 transporters and causes rapid acidification of the root surface. Rhizosphere acidification-triggered STOP1 accumulation activates the excretion of organic acids, which help to solubilize Pi from insoluble iron or calcium phosphates. Ammonium uptake by AMT1 transporters is downregulated by a CIPK23 protein kinase whose expression is directly modulated by STOP1 when ammonium reaches toxic levels. Taken together, we have identified a STOP1-centered regulatory network that links external ammonium with efficient Pi acquisition from insoluble phosphate sources. These findings provide a framework for developing possible strategies to improve crop production by enhancing the utilization of non-bioavailable nutrients in soil.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fosfatos
/
Fatores de Transcrição
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Arabidopsis
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Proteínas de Arabidopsis
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Compostos de Amônio
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Mol Plant
Assunto da revista:
BIOLOGIA MOLECULAR
/
BOTANICA
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
China