Genetics, Vol. 151, 321-330, January 1999, Copyright © 1999

A Consensus Map for Loblolly Pine (Pinus taeda L.). I. Construction and Integration of Individual Linkage Maps From Two Outbred Three-Generation Pedigrees

Mitchell M. Sewella, Bradley K. Shermana, and David B. Nealea,b
a Institute of Forest Genetics, USDA Forest Service, Pacific Southwest Research Station, Placerville, California 95667
b University of California, Department of Environmental Horticulture, Davis, California 95616

Corresponding author: David B. Neale, Institute of Forest Genetics, USDA Forest Service, 1 Shields Ave., Department of Environmental Horticulture, University of California, Davis, CA 95616., dneale{at}dendrome.ucdavis.edu (E-mail)

Communicating editor: A. H. D. BROWN

A consensus map for loblolly pine (Pinus taeda L.) was constructed from the integration of linkage data from two unrelated three-generation outbred pedigrees. The progeny segregation data from restriction fragment length polymorphism, random amplified polymorphic DNA, and isozyme genetic markers from each pedigree were recoded to reflect the two independent populations of parental meioses, and genetic maps were constructed to represent each parent. The rate of meiotic recombination was significantly greater for males than females, as was the average estimate of genome length for males {1983.7 cM [Kosambi mapping function (K)]} and females [1339.5 cM(K)]. The integration of individual maps allows for the synthesis of genetic information from independent sources onto a single consensus map and facilitates the consolidation of linkage groups to represent the chromosomes (n = 12) of loblolly pine. The resulting consensus map consists of 357 unique molecular markers and covers ~1300 cM(K).




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