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Plant Cell, Vol. 10, 801-812, May 1998, Copyright © 1998, American Society of Plant Physiologists

Comparative Mapping of the Brassica S Locus Region and Its Homeolog in Arabidopsis: Implications for the Evolution of Mating Systems in the Brassicaceae

Joann A. Connera, Patrick Connera, Mikhail E. Nasrallaha, and June B. Nasrallaha
a Section of Plant Biology, Division of Biological Sciences, Cornell University, Ithaca, New York 14853

Correspondence to: June B. Nasrallah, jbn2{at}cornell.edu (E-mail), 607-255-5407 (fax).

The crucifer family includes self-incompatible genera, such as Brassica, and self-fertile genera, such as Arabidopsis. To gain insight into mechanisms underlying the evolution of mating systems in this family, we used a selective comparative mapping approach between Brassica campestris plants homozygous for the S8 haplotype and Arabidopsis. Starting with markers flanking the self-incompatibility genes in Brassica, we identified the homeologous region in Arabidopsis as a previously uncharacterized segment of chromosome 1 in the immediate vicinity of the ethylene response gene ETR1. A total of 26 genomic and 21 cDNA markers derived from Arabidopsis yeast artificial and bacterial artificial chromosome clones were used to analyze this region in the two genomes. Approximately half of the cDNAs isolated from the region represent novel expressed sequence tags that do not match entries in the DNA and protein databases. The physical maps that we derived by using these markers as well as markers isolated from bacteriophage clones spanning the S8 haplotype revealed a high degree of synteny at the submegabase scale between the two homeologous regions. However, no sequences similar to the Brassica S locus genes that are known to be required for the self-incompatibility response were detected within this interval or other regions of the Arabidopsis genome. This observation is consistent with deletion of self-recognition genes as a mechanism for the evolution of autogamy in the Arabidopsis lineage.




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