Abstract
Plant cell morphogenesis relies on the organization and function of two polymer arrays separated by the plasma membrane: the cortical microtubule cytoskeleton and cellulose microfibrils in the cell wall. Studies using in vivo markers confirmed that one function of the cortical microtubule array is to drive organization of cellulose microfibrils by guiding the trajectories of active cellulose synthase (CESA) complexes in the plasma membrane, thus orienting nascent microfibrils. Here we provide evidence that cortical microtubules also position the delivery of CESA complexes to the plasma membrane and interact with small CESA-containing compartments by a mechanism that permits motility driven by microtubule depolymerization. The association of CESA compartments with cortical microtubules was greatly enhanced during osmotic stress and other treatments that limit cellulose synthesis. On recovery from osmotic stress, delivery of CESA complexes to the plasma membrane was observed in association with microtubule-tethered compartments. These results reveal multiple functions for the microtubule cortical array in organizing CESA in the cell cortex.
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Acknowledgements
We thank S. Vernhettes, E. Nielsen and N. Geldner for providing transgenic Arabidopsis seeds; V. Kirik for help with vector construction; B. Busse for modifying the ImageJ frame alignment plugin; and S. Debolt, V. Kirik, R. Brown, T. Ketelaar and H. Höfte for helpful discussions. This work was supported by grants from the National Science Foundation (0524334) and the EU Commission (FP6-2004-NEST-C1-028974).
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R.G., J.L. and D.E. designed, carried out and analysed experiments; A.P. created the pCESA6::CFP::CESA6 and 35S::YFP::TUA5 transgenic lines; R.G. made all figures and movies; R.G., D.E. and A.M.E. wrote the manuscript.
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Gutierrez, R., Lindeboom, J., Paredez, A. et al. Arabidopsis cortical microtubules position cellulose synthase delivery to the plasma membrane and interact with cellulose synthase trafficking compartments. Nat Cell Biol 11, 797–806 (2009). https://doi.org/10.1038/ncb1886
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DOI: https://doi.org/10.1038/ncb1886
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