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PLANT PHYSIOLOGY , Vol 102, Issue 3 1001-1008, Copyright © 1993 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
An mRNA Putatively Coding for an O-Methyltransferase Accumulates Preferentially in Maize Roots and Is Located Predominantly in the Region of the Endodermis
B. M. Held, H. Wang, I. John, E. S. Wurtele and J. T. Colbert
Department of Botany, Iowa State University, Ames, Iowa 50011-1020
ZRP4, a 1.4-kb mRNA that preferentially accumulates in roots of young Zea
mays L. plants, was identified by isolation of the corresponding cDNA
clone. Genomic Southern analysis indicates that the zrp4 gene is
represented once in the corn genome. The deduced ZRP4 polypeptide of 39,558
D is rich in leucine, serine, and alanine. Comparison of the deduced ZRP4
polypeptide sequence to polypeptide sequences of previously cloned plant
and animal genes indicates that ZRP4 may be an O-methyltransferase. The
ZRP4 mRNA preferentially accumulates in young roots and can be detected
only at low levels in leaf, stem, and other shoot organs. ZRP4 mRNA
accumulation is developmentally regulated within the root, with very low
levels of accumulation in the meristematic region, higher levels in the
regions of cell elongation, highest levels in the region of cell
maturation, and low levels in the mature regions of the root. ZRP4 mRNA is
predominantly located in the endodermis, with lower levels in the
exodermis. An intriguing possibility is that the ZRP4 mRNA may code for an
O-methyltransferase involved in suberin biosynthesis.
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