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Title:   Author  item
                                            WEI, FUSHENG - ISUitem
                                            WING, ROD - CLEMSON UNIVERSITYitem
                                            Wise, Roger
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 7/14/2001
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: The barley Mla (powdery mildew) resistance cluster contains one of the highest degrees of variability among all plant-disease resistance loci. The primary structure of the 261-kb barley Mla region encompasses thirty-two protein-encoding genes and two tRNApro genes.  Notably, sixteen of these genes are plant-defense related; 12 of these 16 are associated  with defense against powdery mildew disease, but function in different signaling pathways.  These defense related and other protein-encoding sequences are organized as three gene-rich islands separated by two 40-kb complexes of nested transposons and a gene-poor region. Our results indicate that defense-related genes tend to cluster together and that the present Mla region evolved over a period of approximately 7 million years through a series of duplication and inversion events in addition to nested transposable element insertion.  We present a model for the evolution of  the Mla region, which reveals some emerging features of large cereal genomes.


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