Tree Genetics & Genomes

, 4:181 | Cite as

An AFLP linkage map for Douglas-fir based upon multiple full-sib families

  • Nicholas K. Ukrainetz
  • Kermit Ritland
  • Shawn D. MansfieldEmail author
Original Paper


An amplified fragment length polymorphism (AFLP) linkage map for coastal Douglas-fir (Pseudotsuga menziesii) was constructed from eight full-sib families each consisting of 40 progeny. These families were part of the British Columbia Ministry of Forests second-generation progeny test program and represent typical family sizes used in progeny trials. For map construction, ten primer pairs using EcoRI+3 and MseI+4 were employed to identify and assay AFLP loci that segregated in backcross configurations. A new technique was used to obtain a single recombination rate for each pair of marker loci: for each locus pair, a recombination rate and log-odd value were estimated across all segregating families using a joint maximum likelihood function that considered the full dataset of segregating genotypes. The resulting matrix of recombination rates between all pairs of loci was used to construct an integrated linkage map using JoinMap. The final map consisted of 19 linkage groups spanning 938.6 cM at an average distance of 9.3 cM between markers. The simultaneous integration of data from multiple families may provide an effective way to construct a linkage map, using the genetic resources inherent in most tree improvement programs, where progeny tests of small size are conducted. The statistical property of number of families used is briefly discussed. For our data, at least three to four families greatly increased the chance of obtaining an informative locus in at least one family. Families as small as ten are adequate for closely linked loci (<10 cM), while the size used in our study (40) is adequate for loci within 30 cM.


AFLP Linkage map Douglas-fir 



The authors would like to acknowledge funding (to SDM) from Natural Resources Canada (NRCan) Value-to-Wood Program for this project. The authors also gratefully acknowledge Alvin Yanchuk and Michael Stoehr of the BC Ministry of Forests for access to the Douglas-fir breeding trials.


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Nicholas K. Ukrainetz
    • 1
  • Kermit Ritland
    • 2
  • Shawn D. Mansfield
    • 1
    Email author
  1. 1.Department of Wood ScienceUniversity of British ColumbiaVancouverCanada
  2. 2.Department of Forest ScienceUniversity of British ColumbiaVancouverCanada

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