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Marker Trait Association for Autumn Cold Acclimation and Growth Rhythm in Pinus sylvestris

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The main objective of this study was to identify quantitative trait loci (QTLs) involved in the genetic control of growth rhythm and autumn cold acclimation in Pinus sylvestris L. Eighteen full-sib families of P. sylvestris with parental origins between latitudes 62 and 67° N in Sweden were assessed for autumn cold acclimation (frost injury measured from artificial freeze testing) and growth rhythm during the first two growing seasons. One family north×south with 108 individuals was used for the construction of one linkage map for the male and one for the female parent using 286 markers from random amplification of polymorphic DNA. Marker trait associations (QTLs) for shoot elongation, growth cessation and cold acclimation were found on both maps. Some QTLs were verified in two additional north×south families. Proportions of the additive genetic variance explained by the markers (R2G) indicated that genetic factors of large effect were involved in all investigated traits. Single or multiple markers accounted for between 16 and 47% of the additive variance in annual shoot elongation, between 42 and 79% of the additive variance in growth termination, and between 7 and 31% of the additive variation in autumn cold acclimation. The study confirms that there are major QTL regions on different linkage groups controlling a large part of the variation for growth rhythm and autumn cold acclimation in P. sylvestris.

Keywords: QTL; Scots pine; frost tolerance; genetic mapping; quantitative trait loci

Document Type: Research Article


Affiliations: 1: Department of Forest Genetics Swedish University of Agricultural Sciences SE-750 07 Box 7027 Uppsala 2: Department of Forest Genetics and Plant Physiology Swedish University of Agricultural Sciences SE-901 83 Umeå 3: Forest Tree Genetics INRA BP45 F-33610 CESTAS 4: Tissue Culture Pilot Plant National Chemical Laboratory -411 008 Pune

Publication date: January 1, 2003

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