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The Mg-chelatase H subunit is an abscisic acid receptor

Nature volume 443, pages 823826 (19 October 2006) | Download Citation

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Abstract

Abscisic acid (ABA) is a vital phytohormone that regulates mainly stomatal aperture and seed development, but ABA receptors involved in these processes have yet to be determined. We previously identified from broad bean an ABA-binding protein (ABAR) potentially involved in stomatal signalling, the gene for which encodes the H subunit of Mg-chelatase (CHLH), which is a key component in both chlorophyll biosynthesis and plastid-to-nucleus signalling. Here we show that Arabidopsis ABAR/CHLH specifically binds ABA, and mediates ABA signalling as a positive regulator in seed germination, post-germination growth and stomatal movement, showing that ABAR/CHLH is an ABA receptor. We show also that ABAR/CHLH is a ubiquitous protein expressed in both green and non-green tissues, indicating that it might be able to perceive the ABA signal at the whole-plant level.

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Acknowledgements

We thank N. H. Chua for the CLX inducible RNAi system, and Z. Z. Gong and X. C. Wang for advice and help on materials. This work was funded by the National Key Basic Research ‘973’ Program of China and National Natural Science Foundation of China (to D.P.Z.).

Author information

Author notes

    • Yuan-Yue Shen
    • , Xiao-Fang Wang
    •  & Fu-Qing Wu

    These authors contributed equally to this work.

Affiliations

  1. China State Key Laboratory of Plant Physiology and Biochemistry, China Agricultural University, 100094 Beijing, China

    • Yuan-Yue Shen
    • , Xiao-Fang Wang
    • , Fu-Qing Wu
    • , Shu-Yuan Du
    • , Zheng Cao
    • , Yi Shang
    • , Xiu-Ling Wang
    • , Chang-Cao Peng
    • , Xiang-Chun Yu
    • , Sai-Yong Zhu
    • , Ren-Chun Fan
    • , Yan-Hong Xu
    •  & Da-Peng Zhang

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Competing interests

The sequence of the cDNA encoding part of CHLH is deposited in GenBank under accession number DQ376081. Reprints and permissions information is available at www.nature.com/reprints. The authors declare no competing financial interests.

Corresponding author

Correspondence to Da-Peng Zhang.

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    Supplementary Notes

    This file contains Supplementary Methods, Supplementary Tables 1 and 2 and Supplementary Figures 1–9

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https://doi.org/10.1038/nature05176

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