Abstract

Effects of spacing, family and spacing-by-family interaction on corewood and outerwood density, and annual latewood percentage from cambial age 2 to 21years in radiata pine (Pinus radiata D.Don) were studied using 55 families planted at three spacings (1x1, 1x2 and 2x3m). Significant family effects were observed for corewood and outerwood density, and latewood percentage, but spacing effects were significant only for outerwood density and latewood percentage. There was significant spacing-by-family interaction on corewood density (r(B)=0.62). Closer spacing increased latewood percentage in both corewood and outerwood and reduced corewood proportion but it did not increase wood density in corewood significantly. It was also observed that closer spacing had no effect on outerwood length, but increased wood density in outerwood significantly. Closer spacing increased heritability for wood density (1.11 +/- 0.27 vs 0.46 +/- 0.15) and increased juvenile-mature genetic correlations for wood density while increasing the negative genetic correlations between diameter at breast height (DBH) and corewood density. There were positive genetic correlations between latewood percentage and density in both corewood and outerwood. The significant genotype-by-spacing interaction for corewood density may be used to increase wood density of corewood through breeding.

Keywords

Pinus radiata; heritability; genetic correlation; genotype; genotype environment interaction; wood density; spacing

Published in

Australian Forestry
2014, Volume: 77, number: 3-4, pages: 203-211
Publisher: TAYLOR & FRANCIS AUSTRALASIA

SLU Authors

• Wu, Harry

  • Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
    
  • Commonwealth Scientific and Industrial Research Organisation (CSIRO)

UKÄ Subject classification

Forest Science


Publication identifier

DOI: https://doi.org/10.1080/00049158.2014.980878

Permanent link to this page (URI)

https://res.slu.se/id/publ/67166