Tracheid and Pit Dimensions Hardly Vary in the Xylem of <i>Pinus sylvestris</i> Under Contrasting Growing Conditions.

While tree-ring width and earlywood width exhibited a decreasing trend, an increasing trend in latewood width was observed (each p < 0.001; Supplementary Figure 2 ).

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Tree-ring width and earlywood width exhibited a decreasing trend from pith to bark ( p = 0.002 and p < 0.001), whereas latewood width remained constant.

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