Plant Cell Advance Online Publication Published on October 24, 2002; 10.1105/tpc.005231
Received June 12, 2002
Accepted August 5, 2002
Early Gene Expression Associated with the Commitment and Differentiation of a Plant
Tracheary Element Is Revealed by cDNA-Amplified Fragment Length Polymorphism
Analysis
Dimitra Milioni 1, Pierre-Etienne Sado 1, Nicola J. Stacey 1, Keith Roberts 1, and Maureen C. McCann 1*
1
Department of Cell and Developmental Biology, John Innes Centre, Colney, Norwich
NR4 7UH, United Kingdom
* To whom correspondence should be addressed. E-mail: maureen.mccann{at}bbsrc.ac.uk.
Isolated mesophyll cells from Zinnia elegans are induced by auxin and cytokinin
to form tracheary elements (TEs) in vitro with high synchrony. To reveal the changing
patterns of gene expression during the 48 h of transdifferentiation from meso-phyll
to TE cell fate, we used a cDNA-amplified fragment length polymorphism approach
to generate expression profiles of >30,000 cDNA fragments. Transcriptional changes
of 652 cDNA fragments were observed, of which 304 have no previously described function
or sequence identity. Sixty-eight genes were upregulated within 30 min of induction
and represent key candidates for the processes that underlie the early stages of
commitment and differentiation to a TE cell fate.
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