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THE PLANT CELL, Vol 8, Issue 3 429-445, Copyright © 1996 by American Society of Plant Biologists
SRK, the Stigma-Specific S Locus Receptor Kinase of Brassica, Is Targeted to the Plasma Membrane in Transgenic Tobacco
J. C. Stein, R. Dixit, M. E. Nasrallah and J. B. Nasrallah
Section of Plant Biology, Division of Biological Sciences, Cornell University, Ithaca, New York 14853
The S locus receptor kinase (SRK) gene is one of two S locus genes required
for the self-incompatibility response in Brassica. We have identified the
product of the SRK6 gene in B. oleracea stigmas and have shown that it has
characteristics of an integral membrane protein. When expressed in
transgenic tobacco, SRK6 is glycosylated and targeted to the plasma
membrane. These results provide definitive biochemical evidence for the
existence in plants of a plasma membrane-localized transmembrane protein
kinase with a known cell-cell recognition function. The timing of SRK
expression in stigmas follows a time course similar to that previously
described for another S locus-linked gene, the S locus glycoprotein (SLG)
gene, and correlates with the ability of stigmas to mount a
self-incompatibility response. Based on SRK6 promoter studies, the site of
gene expression overlaps with that of SLG and exhibits predominant
expression in the stigmatic papillar cells. Although reporter gene studies
indicated that the SRK promoter was active in pollen, SRK protein was not
detected in pollen, suggesting that SRK functions as a cell surface
receptor exclusively in the papillar cells of the stigma.
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