Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 116, Issue 50, Pages 25343-25354Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1911694116
Keywords
HDA9; thermomorphogenesis; Arabidopsis; shade avoidance; H2A.Z
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Funding
- VENI [863.11.008, 863.15.010]
- Graduate School Starting Materials Grant ALWGSU of the Netherlands Organization for Scientific Research [831.130.02]
- Graduate School Green Top Sectors of the Netherlands Organization for Scientific Research [GSGT.2018.007]
- Swedish Foundation for Strategic Research
- Swedish Research Council
- Ministry of Education, Youth, and Sports of the Czech Republic [CZ.02.1.01/0.0/0.0/16_019/0000827]
- Biotechnology and Biological Sciences Research Council [BB/M023079/1]
- Medical, Veterinary, and Life Sciences Doctoral Studentship from the University of Glasgow
- Netherlands Organisation for Scientific Research [13149]
- Erasmus, Mundus Action 2 project TIMUR (Training of Individuals through Mobility from Uzbek Republic to European Union)
- Australian Research Council [DP190101818]
- BBSRC [BB/M023079/1] Funding Source: UKRI
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Many plant species respond to unfavorable high ambient temperatures by adjusting their vegetative body plan to facilitate cooling. This process is known as thermomorphogenesis and is induced by the phytohormone auxin. Here, we demonstrate that the chromatin-modifying enzyme HISTONE DEACETYLASE 9 (HDA9) mediates thermomorphogenesis but does not interfere with hypocotyl elongation during shade avoidance. HDA9 is stabilized in response to high temperature and mediates histone deacetylation at the YUCCA8 locus, a rate-limiting enzyme in auxin biosynthesis, at warm temperatures. We show that HDA9 permits net eviction of the H2A.Z histone variant from nucleosomes associated with YUCCA8, allowing binding and transcriptional activation by PHYTOCHROME INTERACTING FACTOR 4, followed by auxin accumulation and thermomorphogenesis.
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