Genetic Analysis of 16 Clonal Trials of Eucalyptus grandis and Comparisons with Seedling Checks

In sixteen 3-yr-old trials, clones of plus trees of Eucalyptus grandis (Hill ex. Maiden) had better yield, uniformity, survival, straightness, limb diameter, and more vigorous and full crowns for shading of competing grasses than check lots of seed origin. A select group of 65 out of 460 clones were far superior with mean height = 17.3 m, and volume/ha = 219 m³, versus check lot means of height = 15.2 m and volume/ha = 130 m³. Genetic gain calculations indicate that the expected age three performance values for the selected clones would be height = 16.9 m and volume/ha = 200 m³. Heritability (broad sense) was high for height, dbh, and volume/tree (37% to 41%). Clonal rank correlations among the quality traits (stem straightness, branch diameter, and crown score) were moderately strong (r = 0.57 to 0.81) and their correlations with growth traits were moderate to low but positive. Clonal ranks were consistent across two sites (genetic correlation = 1.00 for volume per tree). Ranks of clones at ages 1 and 2 yr were positively related to their ranks in volume/ha at age 3. Clones selected at these early ages resulted in substantial gains in volume/ha at age 3. For. Sci. 40(3):397-411.

• Publication year

  1994

• Venue

  Forestry sciences

• Publication date

  1994-08-01

• Fields of study

  Agricultural and Food Sciences, Biology

• Identifiers
  DOI 10.1093/forestscience/40.3.397
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

• No references are available for this paper.

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