Arabidopsis histidine-containing phosphotransfer factor 4 (AHP4) negatively regulates secondary wall thickening of theanther endothecium during flowering

Kwang Wook Jung, Seung Ick Oh, Yun Young Kim, Kyoung Shin Yoo, Mei Hua Cui, Jeong Sheop Shin

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Cytokinins are essential hormones in plant development. Arabidopsis histidine-containing phosphotransfer proteins (AHPs) are mediators in a multistep phosphorelay pathway for cytokinin signaling. The exact role of AHP4 has not been elucidated. In this study, we demonstrated young flower-specific expression of AHP4, and compared AHP4-overexpressing (Ox) trangenic Arabidopsis lines and an ahp4 knock-out line. AHP4-Ox plants had reduced fertility due to a lack of secondary cell wall thickening in the anther endothecium and inhibition of IRREGURAR XYLEMs (IRXs) expression in young flowers. Conversely, ahp4 anthers had more lignified anther walls than the wild type, and increased IRXs expression. Our study indicates that AHP4 negatively regulates thickening of the secondary cell wall of the anther endothecium, and provides new insight into the role of cytokinins in formation of secondary cell walls via the action of AHP4.

Original languageEnglish
Pages (from-to)294-300
Number of pages7
JournalMolecules and cells
Volume25
Issue number2
Publication statusPublished - 2008 Apr 30

Keywords

  • AHPs
  • Anther dehiscence
  • Arabidopsis
  • Cytokinin
  • Reduced fertility
  • Secondary wall

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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