Genetics, Vol. 157, 1749-1757, April 2001, Copyright © 2001

High-Resolution Pachytene Chromosome Mapping of Bacterial Artificial Chromosomes Anchored by Genetic Markers Reveals the Centromere Location and the Distribution of Genetic Recombination Along Chromosome 10 of Rice

Zhukuan Chenga, Gernot G. Prestingb, C. Robin Buellc, Rod A. Wingb, and Jiming Jianga
a Department of Horticulture, University of Wisconsin, Madison, Wisconsin 53706,
b Clemson University Genomics Institute, Clemson, South Carolina 29634
c The Institute for Genomic Research, Rockville, Maryland 20850

Corresponding author: Jiming Jiang, Department of Horticulture, University of Wisconsin, 1575 Linden Dr., Madison, WI 53706., jjiang1{at}facstaff.wisc.edu (E-mail)

Communicating editor: B. S. GILL

Large-scale physical mapping has been a major challenge for plant geneticists due to the lack of techniques that are widely affordable and can be applied to different species. Here we present a physical map of rice chromosome 10 developed by fluorescence in situ hybridization (FISH) mapping of bacterial artificial chromosome (BAC) clones on meiotic pachytene chromosomes. This physical map is fully integrated with a genetic linkage map of rice chromosome 10 because each BAC clone is anchored by a genetically mapped restriction fragment length polymorphism marker. The pachytene chromosome-based FISH mapping shows a superior resolving power compared to the somatic metaphase chromosome-based methods. The telomere-centromere orientation of DNA clones separated by 40 kb can be resolved on early pachytene chromosomes. Genetic recombination is generally evenly distributed along rice chromosome 10. However, the highly heterochromatic short arm shows a lower recombination frequency than the largely euchromatic long arm. Suppression of recombination was found in the centromeric region, but the affected region is far smaller than those reported in wheat and barley. Our FISH mapping effort also revealed the precise genetic position of the centromere on chromosome 10.




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