| The tensor-based model for growth and cell divisions of the root apex. I. The significance of principal directions. | |
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MedLine Citation:
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PMID: 18365249 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Plant organs grow symplastically, i.e. in a continuous and coordinated way. Such growth is of a tensor nature, which is manifested in the property that at every point of the organ three mutually orthogonal principal growth directions (PDG) can be recognized. The PDGs are postulated to affect orientation of cell divisions. This paper shows for the first time the 2D simulation model for growth in which cells divide taking into account the PDGs. The model, conceptually based on the growth tensor (GT), is applied to the root apex of radish, having a quiescent centre (QC). It shows the simulation of how exemplary cell pattern of the real root apex develops in time. The results provide satisfactory description of the root growth. The computer-generated cell pattern is realistic and more or less steady indicating that PDGs are important for growth. Presumably cells detect PDGs and obey them in the course of cell divisions. Computer generated division walls, perpendicular to PDGs, form periclinal and anticlinal zigzags as regular as those observed in microscopic sections. Growth tensor defines a field of growth rates at the organ level. QC, fundamental in this field, determines the group of quiescent initial cells which is, in turn, surrounded by active functional initials, from which all tissues of the root apex originate. The present simulations have shown that stability of generated cell pattern depends on whether the group of the functional initials is permanent; if this is not the case, the cell wall pattern changes in accordance with PDGs. |
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Authors:
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Jerzy Nakielski |
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Publication Detail:
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Type: Journal Article Date: 2008-03-26 |
Journal Detail:
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Title: Planta Volume: 228 ISSN: 0032-0935 ISO Abbreviation: Planta Publication Date: 2008 Jun |
Date Detail:
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Created Date: 2008-05-20 Completed Date: 2008-12-10 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 1250576 Medline TA: Planta Country: Germany |
Other Details:
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Languages: eng Pagination: 179-89 Citation Subset: IM |
Affiliation:
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Department of Biophysics and Cell Biology, University of Silesia, Jagiellońska 28, 40-032, Katowice, Poland. nakiel@us.edu.pl |
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| MeSH Terms | |
Descriptor/Qualifier:
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Cell Division
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physiology* Cell Wall / metabolism Computer Simulation Meristem / cytology, growth & development, metabolism Models, Biological* Plant Roots / cytology*, growth & development, metabolism |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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