Mg-chelatase H subunit affects ABA signaling in stomatal guard cells, but is not an ABA receptor in Arabidopsis thaliana

Tomo Tsuzuki, Koji Takahashi, Shin ichiro Inoue, Yukiko Okigaki, Masakazu Tomiyama, Mohammad Anowar Hossain, Ken ichiro Shimazaki, Yoshiyuki Murata, Toshinori Kinoshita

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Mg-chelatase H subunit (CHLH) is a multifunctional protein involved in chlorophyll synthesis, plastid-to-nucleus retrograde signaling, and ABA perception. However, whether CHLH acts as an actual ABA receptor remains controversial. Here we present evidence that CHLH affects ABA signaling in stomatal guard cells but is not itself an ABA receptor. We screened ethyl methanesulfonate-treated Arabidopsis thaliana plants with a focus on stomatal aperture-dependent water loss in detached leaves and isolated a rapid transpiration in detached leaves 1 (rtl1) mutant that we identified as a novel missense mutant of CHLH. The rtl1 and CHLH RNAi plants showed phenotypes in which stomatal movements were insensitive to ABA, while the rtl1 phenotype showed normal sensitivity to ABA with respect to seed germination and root growth. ABA-binding analyses using 3H-labeled ABA revealed that recombinant CHLH did not bind ABA, but recombinant pyrabactin resistance 1, a reliable ABA receptor used as a control, showed specific binding. Moreover, we found that the rtl1 mutant showed ABA-induced stomatal closure when a high concentration of extracellular Ca2+ was present and that a knockout mutant of Mg-chelatase I subunit (chli1) showed the same ABA-insensitive phenotype as rtl1. These results suggest that the Mg-chelatase complex as a whole affects the ABA-signaling pathway for stomatal movements.

Original languageEnglish
Pages (from-to)527-538
Number of pages12
JournalJournal of Plant Research
Volume124
Issue number4
DOIs
Publication statusPublished - Jul 2011

Fingerprint

magnesium chelatase
guard cells
Arabidopsis thaliana
transpiration
receptors
stomatal movement
leaves
phenotype
mutants
ethyl methanesulfonate
knockout mutants
plastids
root growth
seed germination
chlorophyll
calcium
synthesis

Keywords

  • ABA
  • Ca
  • Mg-chelatase H subunit
  • Receptor
  • Signal transduction
  • Stomatal guard cell

ASJC Scopus subject areas

  • Plant Science

Cite this

Tsuzuki, T., Takahashi, K., Inoue, S. I., Okigaki, Y., Tomiyama, M., Hossain, M. A., ... Kinoshita, T. (2011). Mg-chelatase H subunit affects ABA signaling in stomatal guard cells, but is not an ABA receptor in Arabidopsis thaliana. Journal of Plant Research, 124(4), 527-538. https://doi.org/10.1007/s10265-011-0426-x

Mg-chelatase H subunit affects ABA signaling in stomatal guard cells, but is not an ABA receptor in Arabidopsis thaliana. / Tsuzuki, Tomo; Takahashi, Koji; Inoue, Shin ichiro; Okigaki, Yukiko; Tomiyama, Masakazu; Hossain, Mohammad Anowar; Shimazaki, Ken ichiro; Murata, Yoshiyuki; Kinoshita, Toshinori.

In: Journal of Plant Research, Vol. 124, No. 4, 07.2011, p. 527-538.

Research output: Contribution to journalArticle

Tsuzuki, T, Takahashi, K, Inoue, SI, Okigaki, Y, Tomiyama, M, Hossain, MA, Shimazaki, KI, Murata, Y & Kinoshita, T 2011, 'Mg-chelatase H subunit affects ABA signaling in stomatal guard cells, but is not an ABA receptor in Arabidopsis thaliana', Journal of Plant Research, vol. 124, no. 4, pp. 527-538. https://doi.org/10.1007/s10265-011-0426-x
Tsuzuki, Tomo ; Takahashi, Koji ; Inoue, Shin ichiro ; Okigaki, Yukiko ; Tomiyama, Masakazu ; Hossain, Mohammad Anowar ; Shimazaki, Ken ichiro ; Murata, Yoshiyuki ; Kinoshita, Toshinori. / Mg-chelatase H subunit affects ABA signaling in stomatal guard cells, but is not an ABA receptor in Arabidopsis thaliana. In: Journal of Plant Research. 2011 ; Vol. 124, No. 4. pp. 527-538.
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