Affiliation:
1. Department of Plant Biology, Cornell University, Ithaca, NY 14853, USA.
Abstract
In the
S
locus–controlled self-incompatibility system of
Brassica
, recognition of self-related pollen at the surface of stigma epidermal cells leads to inhibition of pollen tube development. The female (stigmatic) determinant of this recognition reaction is a polymorphic transmembrane receptor protein kinase encoded at the
S
locus. Another highly polymorphic, anther-expressed gene,
SCR
, also encoded at the
S
locus, fulfills the requirements for the hypothesized pollen determinant. Loss-of-function and gain-of-function studies prove that the SCR gene product is necessary and sufficient for determining pollen self-incompatibility specificity, possibly by acting as a ligand for the stigmatic receptor.
Publisher
American Association for the Advancement of Science (AAAS)
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