Relationships Between Wood Density and Tracheid Dimensions in <i>Pinus Sylvestris</i> L.
Keywords:Wood density, tracheid cross-sectional dimensions, genetic correlation, image analysis
AbstractThis study aimed at: (1) investigating the relationships between wood density and tracheid dimensions, (2) evaluating to what extent different cross-sectional dimensions could explain the genetic age-age correlations earlier estimated in the same progeny trial. The tracheid cross-sectional dimensions, radial and tangential lumen diameter, and cell-wall thickness were measured on increment cores collected in a progeny trial in southeastern Sweden. The measurements of tracheid dimensions were made with an automated method using image analysis. Data of wood density and tracheid length were taken from a previous study of the same progeny trial. The genetic control was strong for both radial and tangential lumen diameter of the earlywood, moderate for latewood proportion, and low for cell-wall thickness. Earlywood radial and tangential lumen diameter and latewood proportion showed the strongest correlations with wood density. Multiple regression analyses indicated that earlywood radial lumen diameter and latewood proportion were the two most important predictors of wood density, explaining between 24 and 73% of the variation in this trait. The strong genetic age-age correlations for wood density found in the previous study were suggested to be explained by earlywood radial and tangential lumen diameter, which showed positive and significant age-age correlations between family means.
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