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Codominant PCR-based markers for Pinus taeda developed from mapped cDNA clones

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 We report a strategy for developing codominant PCR-based genetic markers by using sequenced cDNA clones from loblolly pine (Pinus taeda L.). These clones were previously used as probes for detecting restriction fragment length polymorphisms (RFLPs) to generate linkage maps. After assessing the complexity of banding patterns from Southern blots, we selected clones representing relatively simple gene families, and then determined nucleotide sequences for about 200 bp at each end of the cDNA inserts. Specific PCR primers were designed to amplify samples of genomic DNA derived from two loblolly pine mapping populations. Polymorphisms were detected after digesting the amplified DNA fragments with a battery of restriction endonucleases, and most polymorphisms were inherited in a Mendelian fashion. These newly identified genetic markers are codominant and relatively simple to use. By assaying DNA from individuals used to construct RFLP maps, we show that most of these markers map to the same position as the RFLP loci detected using their corresponding cDNAs as probes, implying that these markers have been converted from RFLP to PCR-based methods. These PCR-based markers will be useful for genome mapping and population genetics.

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Received: 10 February 1998 / Accepted: 25 February 1998

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Harry, D., Temesgen, B. & Neale, D. Codominant PCR-based markers for Pinus taeda developed from mapped cDNA clones. Theor Appl Genet 97, 327–336 (1998).

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