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Advisor(s)
Abstract(s)
The selection criteria for the first generations in the Portuguese Pinus pinaster improvement program
have been the growth rate and form traits. In this work we study the consequences of this selection on
wood quality traits. This study assesses genetic and phenotypic correlation between growth, wood
density components, lignin content and mechanical traits (radial modulus of elasticity and radial
modulus of rupture) of 46 half sib families from a progeny trail located in Leiria, Portugal, originated from
seed collected in a clonal seed orchard. A total of 552 seventeen-years-old trees (about half of full
rotation age) were sampled at 2 m height. Height measured at 12 years old presented a higher genetic
control (h2 = 0.34) relatively to DBH, measured at 12 and 17 years old respectively (h2 = 0.17 and
h2 = 0.15). The results of this study also showed that DBH growth is more dependent on latewood
components than earlywood components and that higher growth inMediterranean regions can be due to
an increase of the period of latewood formation. Further, we can conclude genetic selection based on
growth will not result in a decrease of wood density, will not affect the occurrence of spiral grain, and is
possible to obtain an increase in the radialmodulus of elasticity. The present study also showed that it is
possible to select for increased growth with lower lignin proportion. Results also suggest that selection
for growth at 12 years will probably not affect negatively the wood properties at 17 years
Description
Keywords
Pinus pinaster genetics growth wood quality
Pedagogical Context
Citation
"Forest Ecology and Management". ISSN 0378-1127. 258 (2009) 115-121
Publisher
Elsevier