Gibberellin driven growth in elf3 mutants requires PIF4 and PIF5

Plant Signaling & Behavior
Julie FiloFrank G Harmon

Abstract

The regulatory connections between the circadian clock and hormone signaling are essential to understand, as these two regulatory processes work together to time growth processes relative to predictable environmental events. Gibberellins (GAs) are phytohormones that control many growth processes throughout all stages of the plant life cycle, including germination and flowering. An increasing number of examples demonstrate that the circadian clock directly influences GA biosynthesis and signaling. EARLY FLOWERING 3 (ELF3) participates in a tripartite transcriptional complex known as the Evening Complex (EC). In this capacity, ELF3 is fundamental to core circadian clock activity, as well as time-of-day specific regulation of genes directly responsible for growth control, namely the PHYTOCHROME INTERACTING FACTOR 4 (PIF4) and PIF5 genes. Here we show that the GA biosynthesis inhibitor paclobutrazol substantially reduces the long hypocotyl and petiole phenotypes of Arabidopsis elf3 mutants. In addition, loss of ELF3 activity causes upregulation of the key GA biosynthesis genes GA20ox1 and GA20ox2. Moreover, GA20ox1 and GA20ox2 expression depends strongly on the redundant activities of PIF4 and PIF5. These findings indicate that the...Continue Reading

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Citations

Apr 12, 2016·Plant Molecular Biology·Hagop S Atamian, Stacey L Harmer
Aug 27, 2016·PloS One·Maximilian O PressChristine Queitsch
Sep 7, 2016·Trends in Genetics : TIG·He Huang, Dmitri A Nusinow
Aug 2, 2016·Plant, Cell & Environment·Marieke DuboisDirk Inzé
Oct 11, 2019·Proceedings of the National Academy of Sciences of the United States of America·Maria A Nohales, Steve A Kay
Jan 24, 2019·International Journal of Molecular Sciences·Hansheng LiZhongxiong Lai

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