Plant Genome III Conference

MOLECULAR-GENETIC MAPS FOR GROUP 1 CHROMOSOMES OF TRITICEAE SPECIES AND THEIR RELATION TO CHROMOSOMES OF RICE AND OAT

1. Department of Plant Breeding and Biometry, Cornell University, Ithaca, NY, USA, 14853
2. Department of Agronomy and Range Science, University of California, Davis, CA, USA, 95616
3. Department of Plant Pathology, Kansas State University, Manhattan, KS, USA, 66506
4. CSIRO, Division of Plant Industry, PO Box 1600, Canberra, ACT, Australia, 2601

Group I chromosomes of the Triticeae tribe have been studied extensively because many important genes have been assigned to them. In this study, we describe linkage maps for chromosome I of Triticum aestivum, T. monococcun and T. monococcum/aestivum. These maps are compared to existing linkage maps for group 1 chromosomes of T. tauschii, barley and rye to develop a consensus map for Triticeae species. The consensus map that was developed consists of 14 agronomically important genes, 17 DNA markers which were derived from known-function clones and 76 DNA markers derived from anonymous clones. A comparison of the consensus map and a physical map based on deletion stocks shows an uneven distribution of recombination in this chromosome. A comparison of the Triticeae group I chromosome consensus map with linkage maps of homoeologous chromosomes in rice that the linkage maps for die long arm and the proximal portion of the short arm of group I chromosomes am conserved among these species. Similarly, gene order is conserved between Triticeae chromosome 1 and its homoeologous chromosome in oat. The location of the centromere in rice and oat chromosomes is estimated from its position in homoeologous group I chromosomes of Triticeae.