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Plant Physiol, December 2000, Vol. 124, pp. 1493-1506
New Techniques Enable Comparative Analysis of Microtubule
Orientation, Wall Texture, and Growth Rate in Intact Roots of
Arabidopsis
Keiko
Sugimoto,1
Richard E.
Williamson, and
Geoffrey O.
Wasteneys*
Plant Cell Biology Group, Research School of Biological Sciences,
Australian National University, Canberra, Australian Capital Territory
2601, Australia
This article explores root epidermal cell elongation and its
dependence on two structural elements of cells, cortical microtubules and cellulose microfibrils. The recent identification of Arabidopsis morphology mutants with putative cell wall or cytoskeletal defects demands a procedure for examining and comparing wall architecture and
microtubule organization patterns in this species. We developed methods
to examine cellulose microfibrils by field emission scanning electron
microscopy and microtubules by immunofluorescence in essentially intact
roots. We were able to compare cellulose microfibril and microtubule
alignment patterns at equivalent stages of cell expansion. Field
emission scanning electron microscopy revealed that Arabidopsis root
epidermal cells have typical dicot primary cell wall structure with
prominent transverse cellulose microfibrils embedded in pectic
substances. Our analysis showed that microtubules and microfibrils have
similar orientation only during the initial phase of elongation growth.
Microtubule patterns deviate from a predominantly transverse
orientation while cells are still expanding, whereas cellulose
microfibrils remain transverse until well after expansion finishes. We
also observed microtubule-microfibril alignment discord before cells
enter their elongation phase. This study and the new technology it
presents provide a starting point for further investigations on the
physical properties of cell walls and their mechanisms of assembly.
1
Present address: Department of Cell Biology,
John Innes Centre, Colney, Norwich, NR4 7UH, UK.
*
Corresponding author; e-mail geoffw{at}rsbs.anu.edu.au; fax
61-0-2-6125-4331.
© 2000 American Society of Plant Physiologists
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