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PLANT PHYSIOLOGY , Vol 103, Issue 3 815-821, Copyright © 1993 by American Society of Plant Biologists

DEVELOPMENT AND GROWTH REGULATION

Molecular Cloning and Characterization of cDNAs Associated with Tracheary Element Differentiation in Cultured Zinnia Cells

T. Demura and H. Fukuda
Biological Institute, Faculty of Science, Tohoku University, Aramaki, Aoba-ku, 980 Sendai, Japan

Mesophyll cells isolated mechanically from leaves of Zinnia elegans L. cv Canary bird differentiate into tracheary elements (TE) semisynchronously and at high frequency. Using this system, three cDNA clones, TED2 to TED4, whose corresponding mRNAs were expressed in a close association with tracheary element differentiation, were isolated by differential screening of [lambda]gt11 cDNA library. The library was prepared using poly(A)+ RNA from cells cultured in a TE-induced medium for 48 h prior to morphological changes, including secondary cell-wall thickenings and autolysis. Northern analysis indicated that mRNAs corresponding to the clones were expressed preferentially in cells differentiating into TEs prior to the morphological changes. The expression of the mRNAs was found not to be induced by [alpha]-naphthaleneacetic acid or benzyladenine solely and not to be associated directly with cell division. Analysis of the nucleotide sequence of TED4 showed that the cDNA contains an open reading frame of 285 bp, encoding a polypeptide comprising 95 amino acid residues with a predicted molecular mass of 10.0 kD. A homology search of the nucleotide and amino acid sequences of TED4 with several data bases revealed a significant similarity to those of the barley aleurone-specific clone B11E, which was isolated as an aleurone-specific cDNA from 20-d postanthesis grain.


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