Theoretical and Applied Genetics

, Volume 102, Issue 8, pp 1142-1151

Mapping of quantitative trait loci controlling adaptive traits in coastal Douglas-fir. I. Timing of vegetative bud flush

  • K. D. JermstadAffiliated withInstitute of Forest Genetics, Pacific Southwest Research Station, USDA, 2480 Carson Road, Placerville, CA 95667, USA e-mail: dneale@dendrome.ucdavis.edu Fax: +1-530-754-9366
  • , D. L. BassoniAffiliated withInstitute of Forest Genetics, Pacific Southwest Research Station, USDA, 2480 Carson Road, Placerville, CA 95667, USA e-mail: dneale@dendrome.ucdavis.edu Fax: +1-530-754-9366
  • , K. S. JechAffiliated withWeyerhaeuser Forestry Research Center, 505 N Pearl Street, Centralia, WA 98531, USA
  • , N. C. WheelerAffiliated withWeyerhaeuser Forestry Research Center, 505 N Pearl Street, Centralia, WA 98531, USA
  • , D. B. NealeAffiliated withInstitute of Forest Genetics, Pacific Southwest Research Station, USDA, 2480 Carson Road, Placerville, CA 95667, USA e-mail: dneale@dendrome.ucdavis.edu Fax: +1-530-754-9366

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Abstract 

Thirty three unique quantitative trait loci (QTLs) affecting the timing of spring bud flush have been identified in an intraspecific mapping population of coastal Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco var. menziesii]. Both terminal and lateral bud flush were measured over a 4-year period on clonal replicates at two test sites, allowing for the repeated estimation of QTLs. QTLs were detected on 12 linkage groups and, in general, each explained a small proportion of the total phenotypic variance and were additive in effect. Several QTLs influence the timing of bud flush over multiple years, supporting earlier evidence that the timing of bud flush through developmental stages is under moderate to strong genetic control by the same suite of genes through developmental stages. However, only a few QTLs controlling the timing of bud flush were detected at both test sites, suggesting that geographic location plays a major role in the phenology of spring growth. A small number of QTLs with year and site interactions were also estimated.

Keywords QTL mapping RFLP Bud phenology Genotype×environment interaction