Redox feedback regulation of ANAC089 signaling alters seed germination and stress response.
Cell Rep
; 35(11): 109263, 2021 06 15.
Article
em En
| MEDLINE
| ID: mdl-34133931
ABSTRACT
The interplay between the phytohormone abscisic acid (ABA) and the gasotransmitter nitric oxide (NO) regulates seed germination and post-germinative seedling growth. We show that GAP1 (germination in ABA and cPTIO 1) encodes the transcription factor ANAC089 with a critical membrane-bound domain and extranuclear localization. ANAC089 mutants lacking the membrane-tethered domain display insensitivity to ABA, salt, and osmotic and cold stresses, revealing a repressor function. Whole-genome transcriptional profiling and DNA-binding specificity reveals that ANAC089 regulates ABA- and redox-related genes. ANAC089 truncated mutants exhibit higher NO and lower ROS and ABA endogenous levels, alongside an altered thiol and disulfide homeostasis. Consistently, translocation of ANAC089 to the nucleus is directed by changes in cellular redox status after treatments with NO scavengers and redox-related compounds. Our results reveal ANAC089 to be a master regulator modulating redox homeostasis and NO levels, able to repress ABA synthesis and signaling during Arabidopsis seed germination and abiotic stress.
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Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Sementes
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Estresse Fisiológico
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Transdução de Sinais
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Arabidopsis
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Germinação
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Proteínas de Arabidopsis
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Retroalimentação Fisiológica
Idioma:
En
Revista:
Cell Rep
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Espanha