Abstract
Seedlings of Pinus sylvestris were grown in long days at day/night temperatures of 27.5/20 °C. 22.5/15 °C, and 17.5/10 °C to determine effects of temperature on tracheid expansion and wall thickening. Inbuilt regulatory systems make it unlikely that mean temperature differences account for much of the normal seasonal variation in tracheid dimensions, for while an increase in temperature increased rates of both tracheid expansion and wall thickening, the duration of both was reduced. Though wall thickness increased with decreasing temperature in tracheids at the same distance from the pith, this was offset by a slower rate of tracheid production at lower temperatures. While rates of wall accumulation increased with increase in temperature, storage starch grain sizes were smaller at higher temperatures. It is suggested that wall thickness is not limited by available substrates in these conditions.
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