Role of melatonin in UV-B signaling pathway and UV-B stress resistance in Arabidopsis thaliana.
Plant Cell Environ
; 44(1): 114-129, 2021 01.
Article
en En
| MEDLINE
| ID: mdl-32860452
ABSTRACT
Melatonin (N-acetyl-5-methoxytryptamine) plays important roles in plant defences against a variety of biotic and abiotic stresses, including UV-B stress. Molecular mechanisms underlying functions of melatonin in plant UV-B responses are poorly understood. Here, we show that melatonin effect on molecular signalling pathways, physiological changes and UV-B stress resistance in Arabidopsis. Both exogenous and endogenous melatonin affected expression of UV-B signal transduction pathway genes. Experiments using UV-B signalling component mutants cop1-4 and hy5-215 revealed that melatonin not only acts as an antioxidant to promote UV-B stress resistance, but also regulates expression of several key components of UV-B signalling pathway, including ubiquitin-degrading enzyme (COP1), transcription factors (HY5, HYH) and RUP1/2. Our findings indicate that melatonin delays and subsequently enhances expression of COP1, HY5, HYH and RUP1/2, which act as central effectors in UV-B signalling pathway, thus regulating their effects on antioxidant systems to protect the plant from UV-B stress.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Transducción de Señal
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Arabidopsis
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Melatonina
Idioma:
En
Año:
2021
Tipo del documento:
Article