Reactive carbonyl species mediate ABA signaling in guard cells

Md Moshiul Islam, Wenxiu Ye, Daiki Matsushima, Shintaro Munemasa, Eiji Okuma, Yoshimasa Nakamura, Md Sanaullah Biswas, Jun'ichi Mano, Yoshiyuki Murata

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Drought is responsible for a massive reduction in crop yields. In response to drought, plants synthesize the hormone ABA, which induces stomatal closure, thus reducing water loss. In guard cells, ABA triggers production of reactive oxygen species (ROS), which is mediated by NAD(P)H oxidases. The production of ROS is a key factor for ABA-induced stomatal closure, but it remains to be clarified how the production of ROS is transduced into downstream signaling components in guard cells. We investigated roles of reactive carbonyl species (RCS) in ABA-induced stomatal closure using transgenic tobacco (Nicotiana tabacum) overexpressing Arabidopsis 2-alkenal reductase (AER-OE), which scavenges RCS. ABA and hydrogen peroxide (H2O2) induced accumulation of RCS including acrolein and 4-hydroxy-(E)-2-nonenal in wild-type tobacco but not in AER-OE. Stomatal closure and RCS accumulation in response to ABA and H2O2 were inhibited in AER-OE unlike in the wild type, while ABA-induced H2O2 production in guard cells was observed in AER-OE as well as in the wild type. Moreover, ABA inhibited inward-rectifying K+ channels in wild-type guard cells but not in AER-OE guard cells. These results suggest that RCS is involved in ABAinduced stomatal closure and functions downstream of H2O2 production in the ABA signaling pathway in guard cells.

Original languageEnglish
Pages (from-to)2552-2563
Number of pages12
JournalPlant and Cell Physiology
Volume57
Issue number12
DOIs
Publication statusPublished - 2016

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Keywords

  • ABA
  • Reactive carbonyl species
  • Reactive oxygen species
  • Stomatal closure

ASJC Scopus subject areas

  • Medicine(all)
  • Physiology
  • Plant Science
  • Cell Biology

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