Inbreeding in <i>Pinus radiata.</i> 
IV: the effect of inbreeding on wood density

Wu, Harry X.; Matheson, A. C.; Abarquez, Aljoy

doi:10.1051/forest:2002041

Cited by 8 publications

(7 citation statements)

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“…Wood density showed the least ID of all traits and was statistically not different (at α=0.05) among inbreeding levels. This lack of ID in wood density has also been observed in radiata pine (Wu et al 2002). These authors hypothesized that the reason for a lack of ID in wood density could be that it is not a fitness trait that is strongly selected against under normal conditions in a growing stand of trees.…”

Section: Discussionmentioning

confidence: 70%

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Inbreeding in mid-rotation coastal Douglas-fir: implications for breeding

Stoehr

Ott

Woods³

2014

Annals of Forest Science

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International audienceAbstractContextThe effects of inbreeding on growth traits have been studied and are fairly well understood in young conifers. However, in trees approaching mid-rotation, this information is not widely available at present. AimThe aim of this study is to assess inbreeding depression in mid-rotation coastal Douglas-fir in growth traits, survival, and wood density.MethodsSeveral levels of inbreeding were created in coastal Douglas-fir, using a nine-clone founder population to produce 148 families with varying levels of inbreeding ranging from f = 0 (outcrossed) to f = 0.5 (selfed). The trees were planted in 1987 on two farm-field sites in coastal BC. Here, we report effects of inbreeding in height, diameter, tree volume, survival, and wood density in 26-year-old trees.ResultsPrevious results obtained from this test population showed negative near linear effects with levels of inbreeding in seed production, nursery growth performance, and growth traits in the field assessed at age 10. At age 26, inbreeding depression was highest in survival, ranging from 20 to 80 % for f = 0.125 and f = 0.5, respectively. In contrast, the most severe inbreeding depression among the three levels of inbreeding was only 4 % for wood density at f = 0.5 (selfing). Inbreeding depression in height, diameter at breast height (dbh), and volume increased linearly from f = 0 to f = 0.25, then leveled off.ConclusionFounder genotypes had varied responses to inbreeding as parental breeding values across inbreeding levels were inconsistent (in magnitude, sign, and trait). No differences in levels of inbreeding depression were found between full-sib matings and parent-offspring matings. These findings have implications for the testing of parents within sublines, where inbreeding is accumulated in sublines. However, since parents respond differently to levels of inbreeding, their performance may not be well correlated to their quality as outcrossing parents

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Section: Discussionmentioning

confidence: 70%

“…It is assumed that the genetic load (as recessive lethals or deleterious homozygotes) for those non-fitness traits is much lower. The work in Pinus radiata and Pinus taeda clearly demonstrates that wood density is not affected by inbreeding (Wu et al 2002;Ford 2012).…”

Section: Introductionmentioning

confidence: 98%

Inbreeding in mid-rotation coastal Douglas-fir: implications for breeding

Stoehr

Ott

Woods³

2014

Annals of Forest Science

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“…It is clear that inbreeding depression can occur and can decrease the fitness of wild populations (e.g., Frankham et al 2002;Spielman et al 2004;Reed 2005). At the same time, however, some studies of natural populations have yielded no evidence of inbreeding depression, despite small population size or genetic homogeneity (e.g., Walter 1990;Schneller and Holderegger 1996;Kalinowski et al 1999;Visscher et al 2001;Wu et al 2002;Duarte et al 2003;Wokac 2003;Windig et al 2004). The findings of this study suggest that such negative results are not necessarily due to a lack of statistical power (Kalinowski et al 1999;Keller and Waller 2002;Frankham et al 2002), but rather, may be explainable by the effectiveness of natural selection during inbreeding in nonbenign environments.…”

Section: Discussionmentioning

confidence: 99%

Selection and Inbreeding Depression: Effects of Inbreeding Rate and Inbreeding Environment

Swindell

Bouzat

2006

Evolution

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The magnitude of inbreeding depression in small populations may depend on the effectiveness with which natural selection purges deleterious recessive alleles from populations during inbreeding. The effectiveness of this purging process, however, may be influenced by the rate of inbreeding and the environment in which inbreeding occurs. Although some experimental studies have examined these factors individually, no study has examined their joint effect or potential interaction. In the present study, therefore, we performed an experiment in which 180 lineages of Drosophila melanogaster were inbred at slow and fast inbreeding rates within each of three inbreeding environments (benign, high temperature, and competitive). The fitness of all lineages was then measured in a common benign environment. Although slow inbreeding reduced inbreeding depression in lineages inbred under high temperature stress, a similar reduction was not observed with respect to the benign or competitive treatments. Overall, therefore, the effect of inbreeding rate was nonsignificant. The inbreeding environment, in contrast, had a larger and more consistent effect on inbreeding depression. Under both slow and fast rates of inbreeding, inbreeding depression was significantly reduced in lineages inbred in the presence of a competitor D. melanogaster strain. A similar reduction of inbreeding depression occurred in lineages inbred under high temperature stress at a slow inbreeding rate. Overall, our findings show that inbreeding depression is reduced when inbreeding takes place in a stressful environment, possibly due to more effective purging under such conditions.

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“…Based on isozyme and microsatellite data (MORAN et al, 1988;KARHU et al, 2006) Guadalupe is the provenance with the lowest allelic richness and expected heterozygosity, followed by Cedros. However, inbreeding appears to have minimal effect on wood density, with both WILCOX (1983) andWU et al (2002) reporting small, non-significant effects across a range of inbreeding levels. RAYMOND and HENSON (2009) suggest inbreeding, combined with between tree competition effects, may have been the cause of the poor growth performance of the island provenances in the Green Hills trial.…”

Section: Discussionmentioning

confidence: 99%

Genetic Variation Amongst and Within The Native Provenances of Pinus radiata D. Don in South-eastern Australia. 2.Wood Density and Stiffness to Age 26 Years

Raymond

Henson²,

Joe³

2009

Silvae Genetica

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Two progeny trials of native provenances of Pinus radiata, representing the 1978 seed collection, were assessed for wood density and standing tree acoustic velocity. One trial, planted in 1980 in southern New South Wales, Australia contains all five provenances. The second trial, planted in the same region in 1982 contains only the island provenances. Results for extracted wood density, assessed from pith to bark in 5 ring segments, and standing tree acoustic velocity, measured at age 24 or 26 years, are reported.Large differences between the mainland and island provenance were apparent for wood density and stiffness. The mainland provenances were very similar for density and followed the "normal" pattern of change with a gradual increase from the pith, followed by a plateauing around age 20. Neither of the island provenances followed this pattern of change in density: Cedros had stable density across the 4 inner most segments and Guadalupe had stable density for the inner two segments followed by a linear increase. Juvenile density was higher in both the island provenances than the mainland provenances. The island provenances differed from each other for standing tree acoustic velocity, with velocity being higher in Guadalupe provenance.Heritabilities for wood density and acoustic velocity (average 0.37) were higher than those for tree growth and form. Across the stem radius, heritability of density was variable with some segments having zero heritabilities in some provenances, particularly Cambria, Cedros and Guadalupe. Heritability for acoustic velocity was highest for Cambria and the island provenances. Within the mainland provenances, little difference was found between populations for either wood density or acoustic velocity. Density and standing tree acoustic velocity were negatively genetically correlated with tree diameter.Differences in provenance means were greater for acoustic velocity than for density in the outermost segment. Provenance rankings also differed, with the rankings for acoustic velocity being similar to those for density in the 2 nd segment from the bark. The genetic correlations between density and velocity reached a maximum for 3 rd segment. These results indicate that outerwood density is not the sole driver of acoustic velocity, and that the sound wave is perhaps not travelling through the outer most wood, but is penetrating some distance into the tree.

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Inbreeding in Pinus radiata. IV: the effect of inbreeding on wood density

Cited by 8 publications

References 9 publications

Inbreeding in mid-rotation coastal Douglas-fir: implications for breeding

Inbreeding in mid-rotation coastal Douglas-fir: implications for breeding

Selection and Inbreeding Depression: Effects of Inbreeding Rate and Inbreeding Environment

Genetic Variation Amongst and Within The Native Provenances of Pinus radiata D. Don in South-eastern Australia. 2.Wood Density and Stiffness to Age 26 Years

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