Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 100, Issue -, Pages 150-155Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2016.01.018
Keywords
Diurnal change; Melatonin; Plant immunity; CBF/DREB1s; CCA1; Arabidopsis
Categories
Funding
- National Natural Science Foundation of China [31570249]
- education curriculum reform program of higher education in Hainan province (title: Research on the overall optimization of the curriculum system and teaching content of Hainan province excellent course-gene engineering) [Hnjg2016-10]
- Hainan University [kyqd1531, hdjy1601]
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Melatonin (N-acetyl-5-methoxytryptamine) is an important regulator of circadian rhythms and immunity in animals. However, the diurnal changes of endogenous melatonin and melatonin-mediated diurnal change of downstream responses remain unclear in Arabidopsis. Using the publicly available microarray data, we found that the transcript levels of two melatonin synthesis genes (serotonin N-acetyltransferase (SNAT) and caffeate O-methyltransferase (COMT)) and endogenous melatonin level were regulated by diurnal cycles, with different magnitudes of change. Moreover, the transcripts of C-repeat-binding factors (CBFs)/Drought response element Binding 1 factors (DREB1s) were co-regulated by exogenous melatonin and diurnal changes, indicating the possible correlation among clock, endogenous melatonin level and AtCBFs expressions. Interestingly, diurnal change of plant immunity against Pst D0000 and CIRCA-DIANCLOCK ASSOCIATED 1 (CCA1) expression were largely lost in AtCBFs knockdown line-amiR-1. Taken together, this study identifies the molecular pathway underlying the diurnal changes of immunity in Arabidopsis. Notably, the diurnal changes of endogenous melatonin may regulate corresponding changes of AtCBF/DREBIs expression and their underlying diurnal cycle of plant immunity and AtCCA1. (C) 2016 Elsevier Masson SAS. All rights reserved.
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