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Vol. 10, Issue 6, 789-807, June 2000

LETTER
A High-throughput AFLP-based Method for Constructing Integrated Genetic and Physical Maps: Progress Toward a Sorghum Genome Map

Patricia E. Klein,1,2 Robert R. Klein,3 Samuel W. Cartinhour,4 Paul E. Ulanch,5 Jianmin Dong,1 Jacque A. Obert,1 Daryl T. Morishige,1,2 Shannon D. Schlueter,1 Kevin L. Childs,1,2 Melissa Ale,1 and John E. Mullet1,2,6

1 Crop Biotechnology Center, and 2 Department of Biochemistry and Biophysics, Texas A & M University, College Station, Texas 77843 USA; 3 USDA-ARS, Southern Plains Agricultural Research Center, College Station, Texas 77845 USA; 4 USDA-ARS, Department of Plant Breeding, Cornell University, Ithaca, New York 14853 USA; 5 Department of Biology, University of Michigan, Ann Arbor, Michigan 48109 USA

Sorghum is an important target for plant genomic mapping because of its adaptation to harsh environments, diverse germplasm collection, and value for comparing the genomes of grass species such as corn and rice. The construction of an integrated genetic and physical map of the sorghum genome (750 Mbp) is a primary goal of our sorghum genome project. To help accomplish this task, we have developed a new high-throughput PCR-based method for building BAC contigs and locating BAC clones on the sorghum genetic map. This task involved pooling 24,576 sorghum BAC clones (~4× genome equivalents) in six different matrices to create 184 pools of BAC DNA. DNA fragments from each pool were amplified using amplified fragment length polymorphism (AFLP) technology, resolved on a LI-COR dual-dye DNA sequencing system, and analyzed using Bionumerics software. On average, each set of AFLP primers amplified 28 single-copy DNA markers that were useful for identifying overlapping BAC clones. Data from 32 different AFLP primer combinations identified ~2400 BACs and ordered ~700 BAC contigs. Analysis of a sorghum RIL mapping population using the same primer pairs located ~200 of the BAC contigs on the sorghum genetic map. Restriction endonuclease fingerprinting of the entire collection of sorghum BAC clones was applied to test and extend the contigs constructed using this PCR-based methodology. Analysis of the fingerprint data allowed for the identification of 3366 contigs each containing an average of 5 BACs. BACs in ~65% of the contigs aligned by AFLP analysis had sufficient overlap to be confirmed by DNA fingerprint analysis. In addition, 30% of the overlapping BACs aligned by AFLP analysis provided information for merging contigs and singletons that could not be joined using fingerprint data alone. Thus, the combination of fingerprinting and AFLP-based contig assembly and mapping provides a reliable, high-throughput method for building an integrated genetic and physical map of the sorghum genome.

[The sequence data described in this paper have been submitted to the GenBank data library under accession no. AF218263.]


6 Corresponding author.


10:789-807 ©2000 by Cold Spring Harbor Laboratory Press  ISSN 1088-9051/00 $5.00

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