Name: high resolution quantification of crystalline cellulose accumulation in arabidopsis roots to monitor tissue-specific cell wall modifications
Uploaded: 2016-05-10T13:00:00
Description: Watch this Scientific Journal Video about High Resolution Quantification of Crystalline Cellulose Accumulation in Arabidopsis Roots to Monitor Tissue-specific Cell Wall Modifications at JoVE.com

We thank Dr. M. Rosenberg for her advice and help with anatomical sectioning. We also thank D. Eisler for his technical assistance. This research was supported by grants from FP7-PEOPLE-IRG-2008, Binational Agriculture research and Development (BARD; IS-4246-09), and Israel Science Foundation (ISF; 592/13).

1. Plant Growth
<ol>
	<li>Surface sterilize seeds.
	<ol>
		<li>Sterilize seeds (up to 30 mg) by wet or dry method. As an example, for dry sterilization method, add 1 ml glacial HCl 37% in 50 ml bleach, in a glass beaker in a closed desiccator for at least 4 hr and up to overnight. Perform this step in a chemical hood.</li>
	</ol>
	</li>
	<li>Spread the sterile seeds on plates with 0.8% plant agar in 0.5x Murashige &#38; Skoog (MS) medium. Wrap plates with Parafilm or porous tape and cover with aluminum foil.</li>
	<li>...

<ol>
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E., Marga, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Disorganization+of+cortical+microtubules+stimulates+tangential+expansion+and+reduces+the+uniformity+of+cellulose+microfibril+alignment+among+cells+in+the+root+of+Arabidopsis.">Disorganization of cortical microtubules stimulates tangential expansion and reduces the uniformity of cellulose microfibril alignment among cells in the root of Arabidopsis.</a> Plant Physiol. 135, 2279-2290 (2004).</li><li>Iyer, K. R. K., Neelakantan, P., Radhakrishnan, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Birefringence+of+native+cellulosic+fibers.+I.+Untreated+cotton+and+ramie.">Birefringence of native cellulosic fibers. I. Untreated cotton and ramie.</a> J. Polym. Sci. 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N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Control+of+Arabidopsis+root+development.">Control of Arabidopsis root development.</a> Annu Rev Plant Biol. 63, 563-590 (2012).</li><li>Vanstraelen, M., Benkova, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hormonal+Interactions+in+the+Regulation+of+Plant+Development.">Hormonal Interactions in the Regulation of Plant Development.</a> Annu Rev Cell Dev Biol. , (2012).</li><li>Singh, A. 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Here, we present a method for determination of the accumulation of crystalline cellulose in the different tissues composing the Arabidopsis roots, while maintaining anatomical information. As such, it provides an additional step towards understanding growth processes in plants at a cellular resolution. This method can be also applied for the study of additional plant species and organs.
A number of points must be considered when applying the method. First, crystalline cellulose accumu...

The plant cell wall is a dynamic structure. Growing cells are surrounded by a primary cell wall, the organization of which allows cells to expand. Cells that cease to grow deposit a more rigid secondary wall that enhances the mechanical support of the plant. Both cell walls are composed of cellulose microfibrils embedded in a matrix of polysaccharides of different structures (e.g., hemicellulose and pectin) that vary across the different developmental stage and tissues1,2. Cellulose is synthesized as chains of (1,4)-&#946;-D-glucan that are tightly aligned to form the microfibril of a crystalline structure. Amorphous cellulose refers to the regions where the glucan chains are less ordered. The ratio between the crystalline and the amorphous domains is one parameter thought to affect the mechanical properties of the cell wall, by providing mechanical strength and viscoelastic characteristic, respectively3. Several methods have been developed to detect and quantify the two forms of cellulose arrangement, among them X-ray diffraction and cross polarization/magic angle spinning solid-state NMR4. X-ray diffraction can be used to determine the proportion of crystalline versus amorphous cellulose domains in the sample5. An alternative method uses fractionation of cell wall content into acid-insoluble and acid-soluble material, to distinguish between the crystalline and amorphous cellulose or other polymers, respectively. In this approach, incorporation of labeled glucose ([14C]Glucose) is used to quantify the cellulose6,7. These methods require large volumes of plant material for whole organ analyses, at best, and hence, are inadequately sensitive to tissue-specific variation in cell wall structure. Visualization of cellulose microfibrils at a cellular resolution can be achieved in live imaging studies combined with fluorescent dyes8,9, that can identify changes in the orientation of the cellulose microfibrils. However, these dyes are not used for quantification, they are not specific to crystalline cellulose and may interfere with the normal structure of the cell wall8. Polscope is an imaging technique that relies on the ability of crystalline cellulose to split light beams and retard part of the light10. Light retardation is strongest for microfibrils that lie perpendicularly to the direction of light propagation. For microfibrils with similar orientation, the higher the degree of crystallinity, the larger the light retardance11. Hence, polscope is used to study both the relative levels and orientation of the cellulose microfibrils.
Roots exhibit linear growth, during which cells originating at the stem cell niche, at the tip of the root, undergo a series of cell divisions, before they rapidly expand12. The cells comprising the root expand in a unidirectional (anisotropic) manner, as dictated by small molecule signaling hormones that impact the properties of the cell wall13. Differential responses to hormones, in time and space, provide a means of ensuring balanced organ growth14. Hence, high resolution analysis of cell wall structure can provide important information necessary to better understand the connection between cell type-specific responses to whole organ growth. Here, we report the implementation of polscope to study tissue-specific accumulation of crystalline cellulose in Arabidopsis roots, as observed in high quality anatomical sections. This method recently uncovered cell type-specific accumulation of crystalline cellulose in response to spatial perturbation of hormonal activity15.

<table>
	<tbody>
		<tr>
			<td>Murashige &#38; Skoog (MS)</td>
			<td>Duchefa</td>
			<td>M0221</td>
			<td></td>
		</tr>
		<tr>
			<td>Borax</td>
			<td>LOBA CHEMIE&#160;</td>
			<td>6038</td>
			<td></td>
		</tr>
		<tr>
			<td>Methylene blue</td>
			<td>Sigma</td>
			<td>M-9140</td>
			<td></td>
		</tr>
		<tr>
			<td>Azure</td>
			<td>Sigma</td>
			<td>861065</td>
			<td></td>
		</tr>
		<tr>
			<td>Syringe Driven 0.22mm PVDF Filter&#160;</td>
			<td>MILLEX-GV</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Glutaraldehyde</td>
			<td>EMS</td>
			<td>16220</td>
			<td></td>
		</tr>
		<tr>
			<td>Sodium Cacodylate</td>
			<td>Sigma</td>
			<td>C-0250</td>
			<td></td>
		</tr>
		<tr>
			<td>Leica kit historesin&#160;</td>
			<td>Leica</td>
			<td>7022 18 500</td>
			<td></td>
		</tr>
		<tr>
			<td>embedding molds</td>
			<td>Agar Scientific</td>
			<td>AGG3530</td>
			<td></td>
		</tr>
		<tr>
			<td>film 100&#181; P.P.C.&#160;</td>
			<td>www.Jolybar.com</td>
			<td></td>
			<td>overhead film</td>
		</tr>
		<tr>
			<td>Knivemaker</td>
			<td>LKB</td>
			<td>7800</td>
			<td></td>
		</tr>
		<tr>
			<td>Ultratome III</td>
			<td>LKB</td>
			<td>8800</td>
			<td>Ultratome</td>
		</tr>
		<tr>
			<td>Shandon immumount&#160;</td>
			<td>Thermo</td>
			<td>9990402</td>
			<td>mounting medium</td>
		</tr>
		<tr>
			<td>light microscope</td>
			<td>Nikon</td>
			<td>Eclipse 80i</td>
			<td></td>
		</tr>
		<tr>
			<td>Abrio imaging system</td>
			<td>CRI</td>
			<td>Abrio imaging system</td>
			<td></td>
		</tr>
		<tr>
			<td>Abrio V2.2 software</td>
			<td>CRI</td>
			<td>Abrio V2.2 software</td>
			<td></td>
		</tr>
		<tr>
			<td>Open access polarized light image analysis software &#160;</td>
			<td>OPS</td>
			<td>OpenPolScope</td>
			<td><a href="http://www.openpolscope.org/">http://www.openpolscope.org/</a></td>
		</tr>
	</tbody>
</table>

high resolution quantification of crystalline cellulose accumulation in arabidopsis roots to monitor tissue-specific cell wall modifications

Plant cells are surrounded by a cell wall, the composition of which determines their final size and shape. The cell wall is composed of a complex matrix containing polysaccharides that include cellulose microfibrils that form both crystalline structures and cellulose chains of amorphous organization. The orientation of the cellulose fibers and their concentrations dictate the mechanical properties of the cell. Several methods are used to determine the levels of crystalline cellulose, each bringing both advantages and limitations. Some can distinguish the proportion of crystalline regions within the total cellulose. However, they are limited to whole-organ analyses that are deficient in spatiotemporal information. Others relying on live imaging, are limited by the use of imprecise dyes. Here, we report a sensitive polarized light-based system for specific quantification of relative light retardance, representing crystalline cellulose accumulation in cross sections of Arabidopsis thaliana roots. In this method, the cellular resolution and anatomical data are maintained, enabling direct comparisons between the different tissues composing the growing root. This approach opens a new analytical dimension, shedding light on the link between cell wall composition, cellular behavior and whole-organ growth.

We study the impact of cell type-specific responses to brassinosteroids (BRs), using the Arabidopsis root as a model organ15-17. When the BR receptor BRI1 is targeted, in the background of bri1 mutant, to a subset of epidermal cells called non-hair cells (Figure 2A,B), it inhibits unidirectional cell expansion of neighboring cells, and whole-root growth15. Polscope analysis was performed to reveal the mechanism underlying this inhib...

Watch this Scientific Journal Video about High Resolution Quantification of Crystalline Cellulose Accumulation in Arabidopsis Roots to Monitor Tissue-specific Cell Wall Modifications at JoVE.com

High Resolution Quantification of Crystalline Cellulose Accumulation in Arabidopsis Roots to Monitor Tissue-specific Cell Wall Modifications

Crystalline cellulose is an important constituent of the plant cell wall. However, its quantification at a cellular resolution is technically challenging. Here, we report the use of polarized light technology and root cross sections to obtain information of cell wall composition at a spatiotemporal resolution.

High Resolution Quantification of Crystalline Cellulose Accumulation in Arabidopsis Roots to Monitor Tissue-specific Cell Wall Modifications

Plant cells are surrounded by a cell wall, the composition of which determines their final size and shape. The cell wall is composed of a complex matrix ...

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