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Establishing and maintaining axial growth: wall mechanical properties and the cytoskeleton.

J. Plant Res.2006 Jan;119(1):5-10. doi:10.1007/s10265-005-0233-3. Epub 2005 Nov 12
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摘要


Organ morphology depends on cell placement and directional cell expansion. Microtubules are involved in both of these processes so genetic approaches to understand the role microtubules play in organ expansion are not straightforward. Our use of the temperature-sensitive mor1-1 mutants led to the surprising discovery that Arabidopsis thaliana (L.) Heynh. root cells can establish and maintain transverse cellulose texture without well organized microtubule arrays. This work also demonstrated that cells can lose the ability to expand anisotropically without losing transversely oriented cellulose microfibrils. We suggest that microtubule disruption affects the cell's ability to generate long cellulose microfibrils, which may be essential for achieving growth anisotropy. Thus organ shape may depend not only on the orientation but also on the relative length of cellulose microfibrils during axis establishment and growth. More recent work has shown an important correlation between microtubule organization and the deposition patterns of the glycosylphosphatidylinositol (GPI)-anchored wall protein COBRA. Loss of microtubule organization is associated with the dissipation of transverse banding patterns of COBRA, suggesting that COBRA's function in maintaining anisotropic expansion may be microtubule-dependent.

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