Heartwood Color and Quantity Variation in a Young Black Walnut Progeny Test
Keywords:
Juglans nigra L., luminance, heritability, heartwood area, specific gravityAbstract
Black walnut heartwood color and quantity were evaluated from disks removed from 334 10-year-old trees at 30 cm above ground during thinning of a progeny test. Average tree height ranged from 3 to 7 m. Heartwood color variables (luminance, dominant wavelength, and purity) differed significantly by block, indicating that color is affected by environment. The darkest heartwood colors were associated with slower growth. No indication of genetic control over any heartwood color variables was observed. Heartwood quantity as measured by heartwood area was heritable; approximate narrowsense heritability of heartwood area was 0.56. Heartwood area was positively correlated with total tree height and dbh, indicating that heartwood area is not sacrificed during selection for height or diameter in young stands. However, the correlations between sapwood area and height and diameter were greater than those with heartwood area.References
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