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- W2071569684 abstract "Plants generate cells and organs throughout their life cycle. Plant cell proliferation relates to the activity of dividing meristematic cells, which subsequently differentiate in a position- and lineage-dependent manner [1Scheres B. Plant cell identity. The role of position and lineage.Plant Physiol. 2001; 125: 112-114Crossref PubMed Scopus (62) Google Scholar]. The events underlying the regulation of cell division and further differentiation processes are under tight control of both intrinsic and environmental parameters [1Scheres B. Plant cell identity. The role of position and lineage.Plant Physiol. 2001; 125: 112-114Crossref PubMed Scopus (62) Google Scholar, 2Stals H. Inzé D. When plant cells decide to divide.Trends Plant Sci. 2001; 6: 359-364Abstract Full Text Full Text PDF PubMed Scopus (159) Google Scholar, 3Meijer M. Murray J.A. Cell cycle controls and the development of plant form.Curr. Opin. Plant Biol. 2001; 4: 44-49Crossref PubMed Scopus (107) Google Scholar]. Among the intrinsic factors, two groups of phytohormones, auxins and cytokinins, exhibit a combined regulatory impact on cell proliferation, as an important determinant for the totipotency of plant cells [4Skoog F. Miller C.O. Chemical regulation of growth and organ formation in plant tissues cultured in vitro.Symp. Soc. Exp. Biol. 1957; 11: 118-131PubMed Google Scholar]. Classical experiments demonstrated that application of both growth regulators in appropriate concentrations promotes callus formation [4Skoog F. Miller C.O. Chemical regulation of growth and organ formation in plant tissues cultured in vitro.Symp. Soc. Exp. Biol. 1957; 11: 118-131PubMed Google Scholar]. When the ratio between the phytohormones changes, callus cells acquire the competence to regenerate organs. Typically, a high auxin-to-cytokinin ratio promotes the formation of roots, whereas a low auxin-to-cytokinin ratio results in the regeneration of shoots. Conclusively, the concerted, proportional impact of both phytohormones functions as a determinant of plant cell proliferation; they act as cell cycle-promoting mitogens as well as morphogens that control plant organogenesis [4Skoog F. Miller C.O. Chemical regulation of growth and organ formation in plant tissues cultured in vitro.Symp. Soc. Exp. Biol. 1957; 11: 118-131PubMed Google Scholar, 5Sugiyama M. Organogenesis in vitro.Curr. Opin. Plant Biol. 1999; 2: 61-64Crossref PubMed Scopus (135) Google Scholar]. Here, we describe PROPORZ1 (PRZ1), an Arabidopsis gene, essential for the developmental switch from cell proliferation to differentiation in response to variations in auxin and cytokinin concentrations. PRZ1 probably acts as a transcriptional adaptor protein that affects the expression of cell cycle regulators and might, thereby, mediate its effect on the control of cell proliferation." @default.
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- W2071569684 date "2003-05-01" @default.
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- W2071569684 title "PROPORZ1, a Putative Arabidopsis Transcriptional Adaptor Protein, Mediates Auxin and Cytokinin Signals in the Control of Cell Proliferation" @default.
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- W2071569684 doi "https://doi.org/10.1016/s0960-9822(03)00327-0" @default.
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