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THE PLANT CELL, Vol 9, Issue 9 1621-1631, Copyright © 1997 by American Society of Plant Biologists
Characterization of Oleosins in the Pollen Coat of Brassica oleracea
R. K. Ruiter, G. J. Van Eldik, RMA. Van Herpen, JAM. Schrauwen and G. J. Wullems
Department of Experimental Botany, University of Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands
Mature Brassica oleracea pollen grains are covered with a lipophilic pollen
coat containing a variety of proteins. Screening of an anther cDNA
expression library for the coding sequences of such proteins resulted in
the isolation of a number of cDNA clones encoding glycine-rich oleosins.
The proteins were shown to be attached to the lipophilic coat material only
and to be absent elsewhere in the plant. Within the coat, several forms of
the pollen coat oleosin with different molecular weights were detected. The
forms are encoded by different transcripts that originate from a single
gene. Expression of this gene is restricted to the tapetum and is
quantitatively regulated by the water content of the anther. Similar
oleosins were found in the pollen coat of B. alboglobra and B. napus.
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