A Potassium-Dependent Oxygen Sensing Pathway Regulates Plant Root Hydraulics.
Cell
; 167(1): 87-98.e14, 2016 Sep 22.
Article
em En
| MEDLINE
| ID: mdl-27641502
ABSTRACT
Aerobic organisms survive low oxygen (O2) through activation of diverse molecular, metabolic, and physiological responses. In most plants, root water permeability (in other words, hydraulic conductivity, Lpr) is downregulated under O2 deficiency. Here, we used a quantitative genetics approach in Arabidopsis to clone Hydraulic Conductivity of Root 1 (HCR1), a Raf-like MAPKKK that negatively controls Lpr. HCR1 accumulates and is functional under combined O2 limitation and potassium (K(+)) sufficiency. HCR1 regulates Lpr and hypoxia responsive genes, through the control of RAP2.12, a key transcriptional regulator of the core anaerobic response. A substantial variation of HCR1 in regulating Lpr is observed at the Arabidopsis species level. Thus, by combinatorially integrating two soil signals, K(+) and O2 availability, HCR1 modulates the resilience of plants to multiple flooding scenarios.
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Base de dados:
MEDLINE
Assunto principal:
Oxigênio
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Potássio
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Água
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Arabidopsis
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Raízes de Plantas
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MAP Quinase Quinase Quinases
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Proteínas de Arabidopsis
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article