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Proc Natl Acad Sci U S A. 2016 Sep 20;113(38):10708-13. doi: 10.1073/pnas.1521599113. Epub 2016 Sep 6.

Chloroplast retrograde signal regulates flowering.

Author information

1
Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
2
Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
3
Department of Molecular Biology, University of Geneva, 1211 Geneva, Switzerland; Department of Plant Biology, University of Geneva, 1211 Geneva, Switzerland;
4
Plant Molecular Biology (Botany), Department of Biology I, Ludwig Maximilian University Munich, 82152 Martinsried, Germany;
5
National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
6
Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; zhanglixin@ibcas.ac.cn.

Abstract

Light is a major environmental factor regulating flowering time, thus ensuring reproductive success of higher plants. In contrast to our detailed understanding of light quality and photoperiod mechanisms involved, the molecular basis underlying high light-promoted flowering remains elusive. Here we show that, in Arabidopsis, a chloroplast-derived signal is critical for high light-regulated flowering mediated by the FLOWERING LOCUS C (FLC). We also demonstrate that PTM, a PHD transcription factor involved in chloroplast retrograde signaling, perceives such a signal and mediates transcriptional repression of FLC through recruitment of FVE, a component of the histone deacetylase complex. Thus, our data suggest that chloroplasts function as essential sensors of high light to regulate flowering and adaptive responses by triggering nuclear transcriptional changes at the chromatin level.

KEYWORDS:

FLC; chloroplast retrograde signals; chromatin remodeling; flowering regulation; high light

PMID:
27601637
PMCID:
PMC5035898
DOI:
10.1073/pnas.1521599113
[Indexed for MEDLINE]
Free PMC Article

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