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Science 26 November 1999:
Vol. 286. no. 5445, pp. 1697 - 1700
DOI: 10.1126/science.286.5445.1697
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Research Articles

The Male Determinant of Self-Incompatibility in Brassica

Christel R. Schopfer, Mikhail E. Nasrallah, June B. Nasrallah *

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.

Department of Plant Biology, Cornell University, Ithaca, NY 14853, USA.
*   To whom correspondence should be addressed. E-mail: jbn2{at}cornell.edu

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J.-C. Mollet, S.-Y. Park, E. A. Nothnagel, and E. M. Lord (2000)
PLANT CELL 12, 1737-1750
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Plasma Membrane-Cell Wall Contacts.
B. D. Kohorn (2000)
Plant Physiology 124, 31-38
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Post-Transcriptional Maturation of the S Receptor Kinase of Brassica Correlates with Co-Expression of the S-Locus Glycoprotein in the Stigmas of Two Brassica Strains and in Transgenic Tobacco Plants.
R. Dixit, M. E. Nasrallah, and J. B. Nasrallah (2000)
Plant Physiology 124, 297-312
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Self-Incompatibility in Brassica: The Elusive Pollen S Gene Is Identified!.
V. E. Franklin-Tong and F. C. H. Franklin (2000)
PLANT CELL 12, 305-308
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How Can Two-Gene Models of Self-Incompatibility Generate New Specificities?.
D. Charlesworth (2000)
PLANT CELL 12, 309-310
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Science. ISSN 0036-8075 (print), 1095-9203 (online)