Plants can prepare for future infections by turning on the expression of defense genes during the times of day when they are most likely to encounter pathogens, according to a study published this week in Nature.
Arabidopsis thaliana
Image: Roepers, Wikimedia
Plants achieve this timing thanks to the synchronization of those resistance genes with their own circadian clock, the daily rhythms that regulate many aspects of plant physiology, the authors report."This is a really elegant piece of work," says molecular biologist at the University of Cape Town in South Africa, linkurl:Laura Roden,; who did not participate in the research. "They discovered this circadian component of disease resistance."With no specialized immune system to speak of, plants rely on a large set of genes that code for receptors and other proteins that specifically recognize molecules, or effectors, from a wide range of pathogens. Known as disease resistance (R) genes, they are responsible...
Downy mildew (dark blue) infecting
Arabidopsis thaliana leaf cells (light blue)

Emmanuel Boutet, Wikimedia
W. Wang, et al., "Timing of plant immune responses by a central circadian regulator," Nature, 470:110-4, 2011.

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