UVR8-TCP4-LOX2 module regulates UV-B tolerance in Arabidopsis.
J Integr Plant Biol
; 66(5): 897-908, 2024 May.
Article
de En
| MEDLINE
| ID: mdl-38506424
ABSTRACT
The phytohormone jasmonate (JA) coordinates stress and growth responses to increase plant survival in unfavorable environments. Although JA can enhance plant UV-B stress tolerance, the mechanisms underlying the interaction of UV-B and JA in this response remain unknown. In this study, we demonstrate that the UV RESISTANCE LOCUS 8 - TEOSINTE BRANCHED1, Cycloidea and PCF 4 - LIPOXYGENASE2 (UVR8-TCP4-LOX2) module regulates UV-B tolerance dependent on JA signaling pathway in Arabidopsis thaliana. We show that the nucleus-localized UVR8 physically interacts with TCP4 to increase the DNA-binding activity of TCP4 and upregulate the JA biosynthesis gene LOX2. Furthermore, UVR8 activates the expression of LOX2 in a TCP4-dependent manner. Our genetic analysis also provides evidence that TCP4 acts downstream of UVR8 and upstream of LOX2 to mediate plant responses to UV-B stress. Our results illustrate that the UV-B-dependent interaction of UVR8 and TCP4 serves as an important UVR8-TCP4-LOX2 module, which integrates UV-B radiation and JA signaling and represents a new UVR8 signaling mechanism in plants.
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Rayons ultraviolets
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Arabidopsis
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Régulation de l'expression des gènes végétaux
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Cyclopentanes
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Protéines d'Arabidopsis
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Oxylipines
Langue:
En
Journal:
J Integr Plant Biol
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J. integr. plant biol. (Online)
/
Journal of integrative plant biology (Online)
Année:
2024
Type de document:
Article
Pays d'affiliation:
Chine
Pays de publication: