Daily humidity oscillation regulates the circadian clock to influence plant physiology

Musoki Mwimba, Sargis Karapetyan, Lijing Liu, Jorge Marqués, Erin M. McGinnis, Nicolas E. Buchler and Xinnian Dong ()
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Musoki Mwimba: Duke University
Sargis Karapetyan: Duke University
Lijing Liu: Duke University
Jorge Marqués: Duke University
Erin M. McGinnis: Duke University
Nicolas E. Buchler: Duke University
Xinnian Dong: Duke University

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract Early circadian studies in plants by de Mairan and de Candolle alluded to a regulation of circadian clocks by humidity. However, this regulation has not been described in detail, nor has its influence on physiology been demonstrated. Here we report that, under constant light, circadian humidity oscillation can entrain the plant circadian clock to a period of 24 h probably through the induction of clock genes such as CIRCADIAN CLOCK ASSOCIATED 1. Under simulated natural light and humidity cycles, humidity oscillation increases the amplitude of the circadian clock and further improves plant fitness-related traits. In addition, humidity oscillation enhances effector-triggered immunity at night possibly to counter increased pathogen virulence under high humidity. These results indicate that the humidity oscillation regulates specific circadian outputs besides those co-regulated with the light-dark cycle.

Date: 2018
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DOI: 10.1038/s41467-018-06692-2

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