LUX ARRHYTHMO mediates crosstalk between the circadian clock and defense in Arabidopsis

Chong Zhang, Min Gao, Nicholas C. Seitz, William Angel, Amelia Hallworth, Linda Wiratan, Omar Darwish, Nadim Alkharouf, Teklu Dawit, Daniela Lin, Riki Egoshi, Xiping Wang, C. Robertson McClung and Hua Lu ()
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Chong Zhang: University of Maryland Baltimore County
Min Gao: University of Maryland Baltimore County
Nicholas C. Seitz: University of Maryland Baltimore County
William Angel: University of Maryland Baltimore County
Amelia Hallworth: University of Maryland Baltimore County
Linda Wiratan: University of Maryland Baltimore County
Omar Darwish: Towson University
Nadim Alkharouf: Towson University
Teklu Dawit: University of Maryland Baltimore County
Daniela Lin: University of Maryland Baltimore County
Riki Egoshi: University of Maryland Baltimore County
Xiping Wang: Northwest A & F University
C. Robertson McClung: Dartmouth College
Hua Lu: University of Maryland Baltimore County

Nature Communications, 2019, vol. 10, issue 1, 1-14

Abstract: Abstract The circadian clock is known to regulate plant innate immunity but the underlying mechanism of this regulation remains largely unclear. We show here that mutations in the core clock component LUX ARRHYTHMO (LUX) disrupt circadian regulation of stomata under free running and Pseudomonas syringae challenge conditions as well as defense signaling mediated by SA and JA, leading to compromised disease resistance. RNA-seq analysis reveals that both clock- and defense-related genes are regulated by LUX. LUX binds to clock gene promoters that have not been shown before, expanding the clock gene networks that require LUX function. LUX also binds to the promoters of EDS1 and JAZ5, likely acting through these genes to affect SA- and JA-signaling. We further show that JA signaling reciprocally affects clock activity. Thus, our data support crosstalk between the circadian clock and plant innate immunity and imply an important role of LUX in this process.

Date: 2019
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DOI: 10.1038/s41467-019-10485-6

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