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Full-Text Articles in Life Sciences
Growth Stress In Eucalyptus Dunnii, Timothy N. Murphy, Michael Henson, Jerome K. Vanclay
Growth Stress In Eucalyptus Dunnii, Timothy N. Murphy, Michael Henson, Jerome K. Vanclay
Professor Jerome K Vanclay
Growth stress in 9-y-old plantation-grown Eucalyptus dunnii was assessed by measuring longitudinal growth strain. Strain varied considerably (370–1560 ìm–1) and was sufficiently heritable (h2 =0.3–0.5) that tree breeding may be an effective way to reduce the incidence of growth stress in this species. Although the formation of longitudinal growth strain appears to be under strong genetic control (P = 0.0015), there was a tendency for tall thin trees to exhibit higher stress than short thick trees (P = 0.025 for height:diameter ratio). Two provenances and three families identified in this study show potential as superior material for further tree breeding.
Genetic Variation In Shrinkage Properties Of Eucalyptus Pilularis Assessed Using Increment Cores And Test Blocks, Marie-Chantale Pelletier, Michael Henson, Steve Boyton, Dane Thomas, Jerome K. Vanclay
Genetic Variation In Shrinkage Properties Of Eucalyptus Pilularis Assessed Using Increment Cores And Test Blocks, Marie-Chantale Pelletier, Michael Henson, Steve Boyton, Dane Thomas, Jerome K. Vanclay
Professor Jerome K Vanclay
Assessments of genetic variation in wood properties are difficult and expensive to carry out. As a consequence, the inclusion of wood quality traits in eucalypt breeding programs has to date been limited. This study is part of a large investigation into the use of non-destructive methods of assessing wood properties by comparing the results with traditional destructive methods. This component of the study investigates the genetic variation in linear shrinkage of 152 open-pollinated families of Eucalyptus pilularis (Smith). Increment cores and test blocks were used to assess radial and tangential shrinkage as well as their ratio. Shrinkage results at 17% …