Arabidopsis synchronizes jasmonate-mediated defense with insect circadian behavior.

Proceedings of the National Academy of Sciences of the United States of America
Danielle GoodspeedMichael F Covington

Abstract

Diverse life forms have evolved internal clocks enabling them to monitor time and thereby anticipate the daily environmental changes caused by Earth's rotation. The plant circadian clock regulates expression of about one-third of the Arabidopsis genome, yet the physiological relevance of this regulation is not fully understood. Here we show that the circadian clock, acting with hormone signals, provides selective advantage to plants through anticipation of and enhanced defense against herbivory. We found that cabbage loopers (Trichoplusia ni) display rhythmic feeding behavior that is sustained under constant conditions, and plants entrained in light/dark cycles coincident with the entrainment of the T. ni suffer only moderate tissue loss due to herbivory. In contrast, plants entrained out-of-phase relative to the insects are significantly more susceptible to attack. The in-phase entrainment advantage is lost in plants with arrhythmic clocks or deficient in jasmonate hormone; thus, both the circadian clock and jasmonates are required. Circadian jasmonate accumulation occurs in a phase pattern consistent with preparation for the onset of peak circadian insect feeding behavior, providing evidence for the underlying mechanism of cl...Continue Reading

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Citations

Jun 12, 2013·Nature Reviews. Genetics·Z Jeffrey Chen
Mar 2, 2012·Proceedings of the National Academy of Sciences of the United States of America·Georg Jander
Aug 28, 2012·Bioinformatics·Bruce A RosaJin Chen
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