Abstract
Cell length differences between populations of sweetgum from the United States and Central America were confirmed in growth chamber studies; fiber tracheid lengths were inversely proportional to latitude of origin. Examinations of cell length differences of populations from south central Kentucky showed similar trends with a pattern of decreased cell length being evident in seedlings grown under lower test temperatures. The effects of temperature and photoperiod on wood specific gravity were assayed, emphasizing seedling progeny from Kentucky. Decreasing day and night temperatures resulted in increased specific gravity of secondary tissues. Longer days and warm temperatures may affect cell length and cellulose deposition, two characters significant in wood quality. The inherent response of local populations to environmental controls may prove to be valuable management tools in selection of desired wood characters.
Published Version
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