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      Differential Growth in Periclinal and Anticlinal Walls during Lobe Formation in Arabidopsis Cotyledon Pavement Cells.

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          Abstract

          Lobe development in the epidermal pavement cells of Arabidopsis thaliana cotyledons and leaves is thought to take place via tip-like growth on the concave side of lobes driven by localized concentrations of actin filaments and associated proteins, with a predicted role for cortical microtubules in establishing the direction of restricted growth at the convex side. We used homologous landmarks fixed to the outer walls of pavement cells and thin-plate spline analysis to demonstrate that lobes form by differential growth of both the anticlinal and periclinal walls. Most lobes formed within the first 24 h of the cotyledons unfurling, during the period of rapid cell expansion. Cortical microtubules adjacent to the periclinal wall were persistently enriched at the convex side of lobes during development where growth was anisotropic and were less concentrated or absent at the concave side where growth was promoted. Alternating microtubule-enriched and microtubule-free zones at the periclinal wall in neighboring cells predicted sites of new lobes. There was no particular arrangement of cortical actin filaments that could predict where lobes would form. However, drug studies demonstrate that both filamentous actin and microtubules are required for lobe formation.

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          Author and article information

          Journal
          Plant Cell
          The Plant cell
          American Society of Plant Biologists (ASPB)
          1532-298X
          1040-4651
          Sep 2015
          : 27
          : 9
          Affiliations
          [1 ] School of Biological Sciences, University of Sydney, NSW 2006, Australia robyn.overall@sydney.edu.au.
          [2 ] School of Biological Sciences, University of Sydney, NSW 2006, Australia.
          Article
          tpc.114.126664
          10.1105/tpc.114.126664
          4815096
          26296967
          e8807c45-57fb-4e73-99df-97c063a128df
          History

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