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Mol. Cells 2008; 25(2): 294-300

Published online April 30, 2008

© The Korean Society for Molecular and Cellular Biology

Arabidopsis Histidine-containing Phosphotransfer Factor 4 (AHP4) Negatively Regulates Secondary Wall Thickening of the Anther Endothecium during Flowering

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

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.

Keywords AHPs, Anther Dehiscence, Arabidopsis, Cytokinin, Reduced Fertility, Secondary Wall

Article

Communication

Mol. Cells 2008; 25(2): 294-300

Published online April 30, 2008

Copyright © The Korean Society for Molecular and Cellular Biology.

Arabidopsis Histidine-containing Phosphotransfer Factor 4 (AHP4) Negatively Regulates Secondary Wall Thickening of the Anther Endothecium during Flowering

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

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.

Keywords: AHPs, Anther Dehiscence, Arabidopsis, Cytokinin, Reduced Fertility, Secondary Wall

Mol. Cells
Jun 30, 2022 Vol.45 No.6, pp. 353~434
COVER PICTURE
ERα is modified by UFM1 and this modification (ufmylation) plays a crucial role in promoting the stability of ERα and breast cancer development. However, when ERα is deufmylated and then ubiquitinated, it disappears by proteasome-mediated degradation (Yoo et al., pp. 425-434).

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