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Cytokinin signaling regulates pavement cell morphogenesis in Arabidopsis

(2013) CELL RESEARCH. 23(2). p.290-299
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Abstract
The puzzle piece-shaped Arabidopsis leaf pavement cells (PCs) with interdigitated lobes and indents is a good model system to investigate the mechanisms that coordinate cell polarity and shape formation within a tissue. Auxin has been shown to coordinate the interdigitation by activating ROP GTPase-dependent signaling pathways. To identify additional components or mechanisms, we screened for mutants with abnormal PC morphogenesis and found that cytokinin signaling regulates the PC interdigitation pattern. Reduction in cytokinin accumulation and defects in cytokinin signaling (such as in ARR 7-over-expressing lines, the ahk3cre1 cytokinin receptor mutant, and the ahp12345 cytokinin signaling mutant) enhanced PC interdigitation, whereas over-production of cytokinin and over-activation of cytokinin signaling in an ARR20 over-expression line delayed or abolished PC interdigitation throughout the cotyledon. Genetic and biochemical analyses suggest that cytokinin signaling acts upstream of ROPs to suppress the formation of interdigitated pattern. Our results provide novel mechanistic understanding of the pathways controlling PC shape and uncover a new role for cytokinin signaling in cell morphogenesis.
Keywords
NEGATIVE REGULATOR, VASCULAR PATTERN, TRANSDUCTION, RECEPTOR, GROWTH, PHOSPHORYLATION, ROOT-MERISTEM, RESPONSE REGULATORS, POLAR AUXIN TRANSPORT, HISTIDINE PHOSPHOTRANSFER PROTEINS, cell morphogenesis, cytokinin, pavement cells, Arabidopsis

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Citation

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Chicago
Li, Hongjiang, Tongda Xu, Deshu Lin, Mingzhang Wen, Mingtang Xie, Jérôme Duclercq, Agnieszka Bielach, et al. 2013. “Cytokinin Signaling Regulates Pavement Cell Morphogenesis in Arabidopsis.” Cell Research 23 (2): 290–299.
APA
Li, Hongjiang, Xu, T., Lin, D., Wen, M., Xie, M., Duclercq, J., Bielach, A., et al. (2013). Cytokinin signaling regulates pavement cell morphogenesis in Arabidopsis. CELL RESEARCH, 23(2), 290–299.
Vancouver
1.
Li H, Xu T, Lin D, Wen M, Xie M, Duclercq J, et al. Cytokinin signaling regulates pavement cell morphogenesis in Arabidopsis. CELL RESEARCH. 2013;23(2):290–9.
MLA
Li, Hongjiang, Tongda Xu, Deshu Lin, et al. “Cytokinin Signaling Regulates Pavement Cell Morphogenesis in Arabidopsis.” CELL RESEARCH 23.2 (2013): 290–299. Print.
@article{3188098,
  abstract     = {The puzzle piece-shaped Arabidopsis leaf pavement cells (PCs) with interdigitated lobes and indents is a good model system to investigate the mechanisms that coordinate cell polarity and shape formation within a tissue. Auxin has been shown to coordinate the interdigitation by activating ROP GTPase-dependent signaling pathways. To identify additional components or mechanisms, we screened for mutants with abnormal PC morphogenesis and found that cytokinin signaling regulates the PC interdigitation pattern. Reduction in cytokinin accumulation and defects in cytokinin signaling (such as in ARR 7-over-expressing lines, the ahk3cre1 cytokinin receptor mutant, and the ahp12345 cytokinin signaling mutant) enhanced PC interdigitation, whereas over-production of cytokinin and over-activation of cytokinin signaling in an ARR20 over-expression line delayed or abolished PC interdigitation throughout the cotyledon. Genetic and biochemical analyses suggest that cytokinin signaling acts upstream of ROPs to suppress the formation of interdigitated pattern. Our results provide novel mechanistic understanding of the pathways controlling PC shape and uncover a new role for cytokinin signaling in cell morphogenesis.},
  author       = {Li, Hongjiang and Xu, Tongda and Lin, Deshu and Wen, Mingzhang and Xie, Mingtang and Duclercq, J{\'e}r{\^o}me and Bielach, Agnieszka and Kim, Jungmook and Reddy, G Venugopala and Zuo, Jianru and Benkova, Eva and Friml, Jiri and Guo, Hongwei and Yang, Zhenbiao},
  issn         = {1001-0602},
  journal      = {CELL RESEARCH},
  language     = {eng},
  number       = {2},
  pages        = {290--299},
  title        = {Cytokinin signaling regulates pavement cell morphogenesis in Arabidopsis},
  url          = {http://dx.doi.org/10.1038/cr.2012.146},
  volume       = {23},
  year         = {2013},
}

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