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RML1 and RML2, Arabidopsis Genes Required for Cell Proliferation at the Root Tip

J. C. Cheng, K. A. Seeley, Z. R. Sung
J. C. Cheng
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K. A. Seeley
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Z. R. Sung
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Published February 1995. DOI: https://doi.org/10.1104/pp.107.2.365

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Abstract

New cells are produced from the meristematic tissues located at the shoot and root tip throughout the life of higher plants. To investigate the genetic mechanism regulating meristematic activity, we isolated and characterized four single-gene, recessive mutants in Arabidopsis thaliana called root meristemless (rml). Complementation tests identified two RML loci; RML1 maps to chromosome IV and RML2 maps to chromosome III. These mutants produce normal embryonic roots that either did not undergo or experienced limited cell division following germination, resulting in primary roots of less than 2.0 mm in length. Mutants can produce lateral and adventitious roots, which can grow to a length comparable to the embryonic root and arrest, indicating that the growth arrest is unrelated to the embryonic dormancy process. Neither the addition of growth regulators to the media nor the removal of shoots can rescue mutant roots from growth arrest, indicating that the mutant phenotype is not caused by a shortage of known growth regulators or by a transmissible shoot inhibitor. Normal cell division ability in mutant embryo, shoot, and callus cells indicates that the RML gene functions are not part of the general cell division processes; rather, they are involved specifically in activating the cell division cycle in the root apical cells.

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RML1 and RML2, Arabidopsis Genes Required for Cell Proliferation at the Root Tip
J. C. Cheng, K. A. Seeley, Z. R. Sung
Plant Physiology Feb 1995, 107 (2) 365-376; DOI: 10.1104/pp.107.2.365

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RML1 and RML2, Arabidopsis Genes Required for Cell Proliferation at the Root Tip
J. C. Cheng, K. A. Seeley, Z. R. Sung
Plant Physiology Feb 1995, 107 (2) 365-376; DOI: 10.1104/pp.107.2.365
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Plant Physiology
Vol. 107, Issue 2
Feb 1995
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More in this TOC Section

  • The rms1 Mutant of Pea Has Elevated Indole-3-Acetic Acid Levels and Reduced Root-Sap Zeatin Riboside Content but Increased Branching Controlled by Graft-Transmissible Signal(s)
  • Bacterial Cellulose-Binding Domain Modulates in Vitro Elongation of Different Plant Cells
  • Gibberellin Dose-Response Regulation of GA4 Gene Transcript Levels in Arabidopsis
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