scholarly journals Modelling the effects of genetic improvement on radiata pine wood density

Author(s):  
Mark O. Kimberley ◽  
John R. Moore ◽  
Heidi S. Dungey
2014 ◽  
Vol 77 (3-4) ◽  
pp. 203-211 ◽  
Author(s):  
Yuanzhen Lin ◽  
Huixiao Yang ◽  
Miloš Ivković ◽  
Washington J. Gapare ◽  
A. Colin Matheson ◽  
...  
Keyword(s):  

Author(s):  
Mark O. Kimberley ◽  
Dave J. Cown ◽  
Russell B. McKinley ◽  
John R. Moore ◽  
Leslie J. Dowling

2015 ◽  
Vol 33 (8) ◽  
pp. 996-1005 ◽  
Author(s):  
Carlos Salinas ◽  
Cristian Chavez ◽  
Ruben A. Ananias ◽  
Diego Elustondo
Keyword(s):  

2001 ◽  
Vol 145 (3) ◽  
pp. 173-180 ◽  
Author(s):  
P.N. Beets ◽  
K. Gilchrist ◽  
M.P. Jeffreys

2019 ◽  
Vol 227 ◽  
pp. 116692 ◽  
Author(s):  
Zongying Fu ◽  
Yongdong Zhou ◽  
Xin Gao ◽  
Honghai Liu ◽  
Fan Zhou

2008 ◽  
Vol 38 (9) ◽  
pp. 2372-2381 ◽  
Author(s):  
S. Kumar ◽  
R. D. Burdon ◽  
G. T. Stovold ◽  
L. D. Gea

Clonal trials of Pinus radiata D. Don (radiata pine), representing two populations (or breeds), one selected for growth and form (GF) and the other selected for high wood density as well as growth and form (HD), were replicated on two low-altitude New Zealand sites: Tarawera (pumice soil, 38°08′S) and Woodhill (coastal dune, 36°42′S). The GF material comprised 33 pair-crosses (19 parents) × 10 clones, and the HD material comprised 19 single-pair crosses (35 parents) × 10 clones, with six ramets per clone per site. Diameter (DBH), two tree-form variables, and needle retention (NRA) were assessed 8 years after planting, and wood density (DEN), acoustic velocity, and collapse were assessed 9 years after planting. The site differences were generally expressed more strongly in the GF population. Estimated genetic parameters were mostly similar for the two breeds, except that genotypic correlation between DBH and DEN was apparently zero in the HD population. Estimated broad-sense heritabilities (H2) were generally markedly higher than narrow-sense heritability estimates (h2), except with DEN. Estimated between-site type-B clonal genotypic correlations were generally high (>0.8) for wood properties. Overall, DBH showed adverse genetic correlations with wood properties. The Elite/Breed strategy appeared to be helpful in combating adverse genetic correlations.


2015 ◽  
Vol 45 (12) ◽  
pp. 1676-1687 ◽  
Author(s):  
Mark O. Kimberley ◽  
John R. Moore ◽  
Heidi S. Dungey

Realised genetic gain for radiata pine (Pinus radiata D. Don) was estimated using data from 46 installations of three series of block-plot trials spanning a wide range of site types throughout New Zealand. These trials contained 63 unique seedlots with different levels of genetic improvement. Realised genetic gain was quantified using two measures of productivity: site index and 300 Index (a measure of volume productivity). The level of genetic improvement of each seedlot was determined by its GF Plus rating, a genetic rating system based on breeding values used for New Zealand radiata pine. There was a positive relationship between GF Plus rating and both productivity measures. Differences of 25% in total standing volume at age 30 years and of 5.6% in site index were found between unimproved (GF Plus 9.9) and highly improved (GF Plus 25) seedlots. Each unit increase in GF Plus rating was associated with a 1.51% increase in volume growth rate. In absolute terms, the magnitude of the increase was greater on more productive sites compared with less productive sites, although in percentage terms, it varied little between sites or regions. Quantification of genetic gain in this manner enables it to be easily incorporated into existing growth and yield simulators.


2013 ◽  
Vol 70 (5) ◽  
pp. 451-459 ◽  
Author(s):  
Eitaro Fukatsu ◽  
Miyoko Tsubomura ◽  
Yoshitake Fujisawa ◽  
Ryogo Nakada

1990 ◽  
Vol 66 (3) ◽  
pp. 281-286 ◽  
Author(s):  
S. Magnussen ◽  
C. T. Keith

Six selection strategies aimed at genetically improving volume production and wood quality factors such as density, heartwood content, and stem taper are compared in a 20-year-old jack pine progeny trial. Selection indices were computed under various assumptions about economic values of the traits under selection and with contraints on the magnitude and direction of expected genetic gain. Stem taper, wood density, and heartwood content were under strong genetic control; however, the low phenotypic variation of wood density limits its potential for genetic improvement. Heartwood content emerged as a trait amenable for rapid genetic improvement. Despite low heritabilities the prospect of improving size-related traits was promising due to substantial phenotypic variation. Economic weights were important for the selection outcome and good progress was reported in all traits when volume received the highest weight. It was feasible to limit genetic gain in individual traits to predetermined relative levels but the cost in terms of reduced gain in unrestricted traits was economically debilitating. Concerns about undesirable concomitant changes in wood density, heartwood, and stem taper when breeding is based solely on growth traits were not confirmed by our data.


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