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THE PLANT CELL, Vol 7, Issue 6 747-757, Copyright © 1995 by American Society of Plant Biologists
Molecular Characterization of BET1, a Gene Expressed in the Endosperm Transfer Cells of Maize
G. Hueros, S. Varotto, F. Salamini and R. D. Thompson
Max-Planck-Institut fur Zuchtungsforschung, Carl-von-Linne-Weg 10, D-50829 Cologne, Germany
A cDNA clone, BET1 (for basal endosperm transfer layer), was isolated from
a cDNA bank prepared from 10-days after pollination (DAP) maize endosperm
mRNA. BET1 mRNA was shown to encode a 7-kD cell wall polypeptide. Both the
mRNA and protein were restricted in their distribution to the basal
endosperm transfer layer and were not expressed elsewhere in the plant.
BET1 expression commenced at 9 DAP, reached a maximum between 12 and 16
DAP, and declined after 16 DAP. The initial accumulation of the BET1
polypeptide reached a plateau by 16 DAP and declined thereafter, becoming
undetectable by 20 DAP. The antibody raised against the BET1 protein
reacted with a number of polypeptides of higher molecular mass than the
BET1 monomer. Most of these were present in cytosolic fractions and were
found in nonbasal cell endosperm extracts, but three species appeared to be
basal cell specific. This result and the reactivity of exhaustively
extracted cell wall material with the BET1 antibody suggest that a fraction
of the protein is deposited in a covalently bound form in the extracellular
matrix. We propose that the BET1 protein plays a role in the structural
specialization of the transfer cells. In addition, BET1 provides a new
molecular marker for the development of this endosperm domain.
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