A phosphate starvation response-centered network regulates mycorrhizal symbiosis.
Cell
; 184(22): 5527-5540.e18, 2021 10 28.
Article
em En
| MEDLINE
| ID: mdl-34644527
ABSTRACT
To secure phosphorus (P) from soil, most land plants use a direct phosphate uptake pathway via root hairs and epidermis and an indirect phosphate uptake pathway via mycorrhizal symbiosis. The interaction between these two pathways is unclear. Here, we mapped a network between transcription factors and mycorrhizal symbiosis-related genes using Y1H. Intriguingly, this gene regulatory network is governed by the conserved P-sensing pathway, centered on phosphate starvation response (PHR) transcription factors. PHRs are required for mycorrhizal symbiosis and regulate symbiosis-related genes via the P1BS motif. SPX-domain proteins suppress OsPHR2-mediated induction of symbiosis-related genes and inhibit mycorrhizal infection. In contrast, plants overexpressing OsPHR2 show improved mycorrhizal infection and are partially resistant to P-mediated inhibition of symbiosis. Functional analyses of network nodes revealed co-regulation of hormonal signaling and mycorrhizal symbiosis. This network deciphers extensive regulation of mycorrhizal symbiosis by endogenous and exogenous signals and highlights co-option of the P-sensing pathway for mycorrhizal symbiosis.
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Base de dados:
MEDLINE
Assunto principal:
Fosfatos
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Simbiose
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Micorrizas
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Redes Reguladoras de Genes
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article