A consensus map for loblolly pine (Pinus taeda L.). I. Construction and integration of individual linkage maps from two outbred three-generation pedigrees

A consensus map for loblolly pine (Pinus taeda L.) was constructed from the integration of linkage data from two unrelated thr ee-generation outbred p edigrees. The progeny segregation data from restriction fragment length pol ymorphism, random amplified polymorphic DNA, and isozyme genetic markers fr om each pedigree were recoded to reflect the two independent populations of parental meioses, and genetic maps were constructed to represent each pare nt. The rate of meiotic recombination was significantly greater for males t han 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 integra tion of individual maps allows for the synthesis of genetic information fro m independent sources onto a single consensus map and facilitates the conso lidation of linkage groups to represent the chromosomes (n = 12) of lobloll y pine. The resulting consensus map consists of 357 unique molecular marker s and covers similar to 1300 cM(K).