This work was supported by the National Science Foundation (grant no. DBI 0519984) and the National Institutes of Health (grant no. 5R01GM078279)..

1) Preparation of the plant material
<ol>
 <li>Protoplasts can be derived from many different plant species and tissues provided that the right mix of cell wall digesting enzymes is used1. Before a full-scale experiment is undertaken, a small-scale digestion of the material is advisable in order to evaluate the protoplasting efficiency of the tissue, enzymes, etc. and to estimate the percent positive cells for cell sorting. Here, protoplasts derived from the roots of Arabidopsis thaliana seedli...

<ol>
	<li>Sheen, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Signal+transduction+in+maize+and+Arabidopsis+mesophyll+protoplasts.">Signal transduction in maize and Arabidopsis mesophyll protoplasts.</a> Plant Physiol. 127, 1466-1475 (2001).</li><li>Wysocka-Diller, J. W., Helariutta, Y., Fukaki, H., Malamy, J. E., Benfey, P. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Molecular+analysis+of+SCARECROW+function+reveals+a+radial+patterning+mechanism+common+to+root+and+shoot.">Molecular analysis of SCARECROW function reveals a radial patterning mechanism common to root and shoot.</a> Development. 127, 595-603 (2000).</li><li>Blilou, I., Xu, J., Wildwater, M., Willemsen, V., Paponov, I., Friml, J., Heidstra, R., Aida, M., Palme, K., Scheres, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+PIN+auxin+efflux+facilitator+network+controls+growth+and+patterning+in+Arabidopsis+roots.">The PIN auxin efflux facilitator network controls growth and patterning in Arabidopsis roots.</a> Nature. 433, 39-44 (2005).</li><li>Gifford, M. L., Dean, A., Gutierrez, R. A., Coruzzi, G. M., Birnbaum, K. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cell-specific+nitrogen+responses+mediate+developmental+plasticity.">Cell-specific nitrogen responses mediate developmental plasticity.</a> Proc Natl Acad Sci U S A. 105, 803-808 (2008).</li><li>Bargmann, B. O. R., Birnbaum, K. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Positive+fluorescent+selection+permits+precise,+rapid,+and+in-depth+overexpression+analysis+in+plant+protoplasts.">Positive fluorescent selection permits precise, rapid, and in-depth overexpression analysis in plant protoplasts.</a> Plant Physiol. 149, 1231-1239 (2009).</li><li>Petersson, S. V., Johansson, A. I., Kowalczyk, M., Makoveychuk, A., Wang, J. Y., Moritz, T., Grebe, M., Benfey, P. N., Sandberg, G., Ljung, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+Auxin+Gradient+and+Maximum+in+the+Arabidopsis+Root+Apex+Shown+by+High-Resolution+Cell-Specific+Analysis+of+IAA+Distribution+and+Synthesis.">An Auxin Gradient and Maximum in the Arabidopsis Root Apex Shown by High-Resolution Cell-Specific Analysis of IAA Distribution and Synthesis.</a> Plant Cell. 21, 1659-1668 (2009).</li></ol>

Protoplasts can, in principle, be derived from a variety of plant tissues, optimizing favorable conditions will greatly enhance RNA quality and quantity. Both the protoplasting solution and the elective incubation buffer used will influence this aspect.
Many different fluorescent proteins can be used, depending on the capabilities of the FACS used, e.g. GFP, RFP, YFP, CFP or their many variants and derivatives. The expression of the markers could be driven not just by cell type-speci...

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		<div>
		<table border="1">
		<thead>
		<tr>
		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
		</tr>
		</thead>
		<tbody>
		
<tr>
<td>250 &mu;m nylon mesh</td>
<td>&nbsp;</td>
<td>Sefar Filtration</td>
<td>NITEX 03-250/50</td>
<td>&nbsp;</td>
<tr>
<td>100 &mu;m nylon mesh</td>
<td>&nbsp;</td>
<td>Sefar Filtration</td>
<td>NITEX 03-100/47</td>
<td>&nbsp;</td>
<tr>
<td>Square petri dishes</td>
<td>&nbsp;</td>
<td>Fisher Scientific</td>
<td>08-757-10k</td>
<td>&nbsp;</td>
<tr>
<td>Phytatrays</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>P1552</td>
<td>&nbsp;</td>
<tr>
<td>Murashige and Skoog Basal Medium (MS)</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>M5519</td>
<td>&nbsp;</td>
<tr>
<td>sucrose</td>
<td>&nbsp;</td>
<td>Fisher Scientific</td>
<td>S5-3</td>
<td>&nbsp;</td>
<tr>
<td>MES</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>M2933</td>
<td>&nbsp;</td>
<tr>
<td>KOH</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>P1767</td>
<td>10 M stock</td>
</tr>
<tr>
<td>Eclipse 90i microscope</td>
<td>&nbsp;</td>
<td>Nikon</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Cellulase R-10</td>
<td>&nbsp;</td>
<td>Yakult Pharmaceutical</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Macerozyme R-10</td>
<td>&nbsp;</td>
<td>Yakult Pharmaceutical</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>D-mannitol</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>M9546</td>
<td>&nbsp;</td>
<tr>
<td>KCl</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>P8041</td>
<td>1 M stock</td>
</tr>
<tr>
<td>BSA</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>A3912</td>
<td>&nbsp;</td>
<tr>
<td>&beta;-mercaptoethanol</td>
<td>&nbsp;</td>
<td>CALBIOCHEM</td>
<td>444203</td>
<td>&nbsp;</td>
<tr>
<td>CaCl2</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>C2536</td>
<td> 1 M stock</td>
</tr>
<tr>
<td>orbital shaker</td>
<td>&nbsp;</td>
<td>LAB-LINE</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>40 &mu;m cell strainer</td>
<td>&nbsp;</td>
<td>BD Falcon</td>
<td>352340</td>
<td>&nbsp;</td>
<tr>
<td>conical 15 ml tubes</td>
<td>&nbsp;</td>
<td>BD Falcon</td>
<td>352196</td>
<td>&nbsp;</td>
<tr>
<td>table centrifuge</td>
<td>&nbsp;</td>
<td>Sorvall</td>
<td>Legend RT</td>
<td>&nbsp;</td>
<tr>
<td>NaCl</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>S3014</td>
<td>&nbsp;</td>
<tr>
<td>FACSAria</td>
<td>&nbsp;</td>
<td>BD</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>1.5 ml microfuge tubes</td>
<td>&nbsp;</td>
<td>VWR</td>
<td>20170-38</td>
<td>&nbsp;</td>
<tr>
<td>RNeasy micro kit</td>
<td>&nbsp;</td>
<td>QIAGEN</td>
<td>74004</td>
<td>&nbsp;</td>
<tr>
<td>WT-Ovation Pico RNA Amplification System</td>
<td>&nbsp;</td>
<td>NuGEN</td>
<td>3300_12</td>
<td>&nbsp;</td>
<tr>
<td>FL-Ovation cDNA Biotin Module V2</td>
<td>&nbsp;</td>
<td>NuGEN</td>
<td>4200_12</td>
<td>&nbsp;</td>		</tbody>
		</table>
		</div>

fluorescence activated cell sorting of plant protoplasts

High-resolution, cell type-specific analysis of gene expression greatly enhances understanding of developmental regulation and responses to environmental stimuli in any multicellular organism. In situ hybridization and reporter gene visualization can to a limited extent be used to this end but for high resolution quantitative RT-PCR or high-throughput transcriptome-wide analysis the isolation of RNA from particular cell types is requisite. Cellular dissociation of tissue expressing a fluorescent protein marker in a specific cell type and subsequent Fluorescence Activated Cell Sorting (FACS) makes it possible to collect sufficient amounts of material for RNA extraction, cDNA synthesis/amplification and microarray analysis.
An extensive set of cell type-specific fluorescent reporter lines is available to the plant research community. In this case, two marker lines of the Arabidopsis thaliana root are used: PSCR::GFP (endodermis and quiescent center) and PWOX5::GFP (quiescent center). Large numbers (thousands) of seedlings are grown hydroponically or on agar plates and harvested to obtain enough root material for further analysis. Cellular dissociation of plant material is achieved by enzymatic digestion of the cell wall. This procedure makes use of high osmolarity-induced plasmolysis and commercially available cellulases, pectinases and hemicellulases to release protoplasts into solution.
FACS of GFP-positive cells makes use of the visualization of the green versus the red emission spectra of protoplasts excited by a 488 nm laser. GFP-positive protoplasts can be distinguished by their increased ratio of green to red emission. Protoplasts are typically sorted directly into RNA extraction buffer and stored for further processing at a later time.
This technique is revealed to be straightforward and practicable. Furthermore, it is shown that it can be used without difficulty to isolate sufficient numbers of cells for transcriptome analysis, even for very scarce cell types (e.g. quiescent center cells). Lastly, a growth setup for Arabidopsis seedlings is demonstrated that enables uncomplicated treatment of the plants prior to cell sorting (e.g. for the cell type-specific analysis of biotic or abiotic stress responses). Potential supplementary uses for FACS of plant protoplasts are discussed.

Watch this Scientific Journal Video about Fluorescence Activated Cell Sorting of Plant Protoplasts at JoVE.com

Fluorescence Activated Cell Sorting of Plant Protoplasts

A method for isolating specific cell types from plant material is demonstrated. This technique employs transgenic marker lines expressing fluorescent proteins in particular cell types, cellular dissociation and Fluorescence Activated Cell Sorting. Additionally, a growth setup is established here that facilitates treatment of Arabidopsis thaliana seedlings prior to cell sorting.

High-resolution, cell type-specific analysis of gene expression greatly enhances understanding of developmental regulation and responses to environmental ...

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Biology

24.6K visualizações.  New York University. Um método para isolar tipos específicos de células a partir de material vegetal é demonstrada. Esta técnica emprega linhas marcador transgênicos expressando proteínas fluorescentes em tipos de células particular, celular dissociação e classificação de fluorescência celular ativado. Além disso, uma instalação de crescimento é estabelecido aqui que facilita o tratamento de Arabidopsis thaliana Mudas antes da separação de células.