Melatonin induces the transcripts of CBF/DREB1s and their involvement in both abiotic and biotic stresses in Arabidopsis.

作   者：施海涛，钱永强(共同一作), Dun-Xian Tan, Russel J. Reiter and Chaozu He.
期刊名称：J. Pineal Res.
影响因子：10.391
卷 期 号：59
页     码：334–342
关键词：abiotic and biotic stresses,?Arabidopsis,?CBF/DREB1s, melatonin, transcription factor
论文摘要：
Melatonin (N-acetyl-5-methoxytryptamine) is a naturally occurring small molecule that acts as an important secondary messenger in plant stress responses. However, the mechanism underlying the melatonin-mediated signaling pathway in plant stress responses has not been established. C-repeatbinding factors (CBFs)/Drought response element Binding 1 factors (DREB1s) encode transcription factors that play important roles in plant stress responses. This study has determined that endogenous melatonin and transcripts level of
CBFs (AtCBF1, AtCBF2, and AtCBF3) in Arabidopsis leaves were significantly
induced by salt, drought, and cold stresses and by pathogen Pseudomonas
syringe pv. tomato (Pst) DC3000 infection. Moreover, both exogenous
melatonin treatment and overexpression of CBFs conferred enhanced
resistance to both abiotic and biotic stresses in Arabidopsis. Notably, AtCBFs
and exogenous melatonin treatment positively regulated the mRNA expression
of several stress-responsive genes (COR15A, RD22, and KIN1) and
accumulation of soluble sugars content such as sucrose in Arabidopsis under
control and stress conditions. Additionally, exogenous sucrose also conferred
improved resistance to both abiotic and biotic stresses in Arabidopsis. Taken
together, this study indicates that AtCBFs confer enhanced resistance to both
abiotic and biotic stresses, and AtCBF-mediated signaling pathway and sugar
accumulation may be involved in melatonin-mediated stress response in
Arabidopsis, at least partially.