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Abstract Clones of Norway spruce (Picea abies L.) were grown for several years on an altitudinal gradient (1750m, 1150m and 800m above sea level) to study the effects of environmentalgenetic interactions on growth and foliar metabolites (protein, pigments, antioxidants). Clones at the tree line showed 4.3-fold lower growth rates and contained 60% less chlorophyll (per gram of dry matter) than those...
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