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Title:   Author  item
                                            Wise, Rogeritem
                                            PEI, DEQING - IOWA STATE UNIVERSITYitem
                                            Gobelman Werner, Karin
  Submitted to: Plant Molecular Biology International Conference Proceedings
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 6/20/2000
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: T-cytoplasm maize (cms-T) has been developed as a model to study the genetic and molecular mechanisms underlying male sterility and fertility restoration.  Male sterility in cms-T results from the function of the T- cytoplasm specific, mitochondrial gene, T-urf13.  Nuclear restorer (Rf) genes suppress CMS-associated male sterility.  In cms-T, restoration of  fertility is mediated by one of three (Rf1, Rf8, or Rf*) nuclear restorers in combination with the Rf2 restorer.  Rf2 encodes a mitochondrial aldehyde dehydrogenase, whereas, Rf1, Rf8, and Rf* each mediate discrete T-urf13 transcript processing events.  To isolate the Rf1 gene, a Mutator transposon tagging approach was used to generate rf1-m insertion mutants. Cosegregating amplified fragments were identified via AFLP transposon display (AIMS) from three independent rf1-m families.  Analysis of candidate cDNAs indicates that the rf1 locus is very large.  Therefore, to  determine the physical features of this locus, a BAC contig spanning the rf1genomic region is being assembled.  Two B73 BAC libraries were screened using tightly linked RFLPs, AIMS fragments, and low-copy probes designed from the rf1 candidate cDNA.  BAC clones were grouped into contigs by restriction-digest fingerprints and hybridization analysis.  BAC-end sequence data were used to design "overgos" for further library screening. The development of a DNA contig spanning rf1 will facilitate the complete characterization of this interesting region of the maize genome.  Research supported by USDA-NRI/CGP grant 99-01334.


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