Effects of silvicultural practices on genetic diversity and population structure of white spruce in Saskatchewan

Fageria, M. S.; Rajora, Om P.

doi:10.1007/s11295-013-0682-0

Cited by 25 publications

(15 citation statements)

References 35 publications

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“…brutia (AlHawija et al 2014) and Dalbergia sissoo (Pandey et al 2004). The results previously obtained in Picea glauca by RAPD markers (Rajora 1999) were reassessed using microsatellites by Fageria & Rajora (2014); a similar trend of reduction in GD was found, but the differences between progeny from phenotypic selection and natural regeneration were not significant (Tab. 3).…”

Section: Reforestation (Artificial Regeneration)supporting

confidence: 59%

Genetic diversity and forest reproductive material - from seed source selection to planting

Ivetić¹,

Devetaković²,

Nonić³

et al. 2016

iForest

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Relation between genetic diversity and mass production of forest reproductive material is discussed in a holistic manner. In industrial forest plantations, narrow genetic diversity is desirable and reproductive material is produced at clone level. On the other hand, in conservation forestry a wide genetic diversity is imperative. Beside management goals, a desirable level of genetic diversity is related to rotation cycle and ontogeny of tree species. Risks of failure are lower in short rotations of fast growing species. In production of slow growing species, managed in long rotations, the reduction of genetic diversity increases the risk of failure due to causes unknown or unexpected at the time of planting. This risk is additionally increased in cases of seed transfer and in conditions of climate change. Every step in production of forest reproductive material, from collection to nursery production, has an effect on genetic diversity mainly by directional selection and should be considered. This review revealed no consistent decrease of genetic diversity during forest reproductive material production and planting.

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Section: Reforestation (Artificial Regeneration)supporting

confidence: 59%

Genetic diversity and forest reproductive material - from seed source selection to planting

Ivetić¹,

Devetaković²,

Nonić³

et al. 2016

iForest

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“…The genetic diversity of post-harvest young natural regeneration was similar to that of unharvested old-growth. In a subsequent study, using microsatellite markers, similar patterns of genetic diversity among old-growth, young natural regeneration, plantations and phenotypic selections were observed (Fageria and Rajora, 2014). These studies while differing in some conclusions, demonstrated that genetic diversity can be maintained by natural regeneration systems in white spruce.…”

Section: Clearcut Harvesting Followed By Natural or Artificial Regenementioning

confidence: 65%

Genetic effects of forest management practices: Global synthesis and perspectives

Ratnam

Rajora

Finkeldey

et al. 2014

Forest Ecology and Management

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115

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Understanding the genetic impacts of forest management practices is crucial for conservation and management of forest genetic resources. Forest management practices based on selective and clear cut systems followed by natural or artificial regeneration can impact population structure and mating patterns, thus gene flow and genetic diversity. Survival and productivity of both tree and non-tree species can be compromised or, possibly, enhanced. The extent of genetic impacts depend on the management system applied, stand structure as well as species' distribution, demography, biological attributes and ecology. The impact of management practices is reviewed and synthesized for temperate, boreal and tropical forests based on experimental and simulation studies. In addition, the effects of genetically improved planting materials and establishment of large scale plantations on natural forests are examined. Recommendations are made for genetically sustainable forest management practices. (Résumé d'auteur

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“…Although founders showed no half- or full-sib trees (Table 1 ), the identification of second cousins (31.5%) indicates that not all trees were equally spaced within the sampled stands. Seed orchards may be designed to maintain the genetic base of the parents producing deployable seedlots; however orchards also often have a different genetic arrangement when compared with natural stands 38 , which may lead to a significant increase in relatedness. In Alberta 8 , every seedlot must meet an Ne level ≥ 18, however, combined with uneven contributions and increased relatedness within these seedlots, policy requirements may be difficult to meet.…”

Section: Discussionmentioning

confidence: 99%

SNP-based analysis reveals unexpected features of genetic diversity, parental contributions and pollen contamination in a white spruce breeding program

Galeano

Bousquet

Thomas

2021

Sci Rep

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Accurate monitoring of genetic diversity levels of seedlots and mating patterns of parents from seed orchards are crucial to ensure that tree breeding programs are long-lasting and will deliver anticipated genetic gains. We used SNP genotyping to characterize founder trees, five bulk seed orchard seedlots, and trees from progeny trials to assess pollen contamination and the impact of severe roguing on genetic diversity and parental contributions in a first-generation open-pollinated white spruce clonal seed orchard. After severe roguing (eliminating 65% of the seed orchard trees), we found a slight reduction in the Shannon Index and a slightly negative inbreeding coefficient, but a sharp decrease in effective population size (eightfold) concomitant with sharp increase in coancestry (eightfold). Pedigree reconstruction showed unequal parental contributions across years with pollen contamination levels between 12 and 51% (average 27%) among seedlots, and 7–68% (average 30%) among individual genotypes within a seedlot. These contamination levels were not correlated with estimates obtained using pollen flight traps. Levels of pollen contamination also showed a Pearson’s correlation of 0.92 with wind direction, likely from a pollen source 1 km away from the orchard under study. The achievement of 5% genetic gain in height at rotation through eliminating two-thirds of the orchard thus generated a loss in genetic diversity as determined by the reduction in effective population size. The use of genomic profiles revealed the considerable impact of roguing on genetic diversity, and pedigree reconstruction of full-sib families showed the unanticipated impact of pollen contamination from a previously unconsidered source.

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Effects of silvicultural practices on genetic diversity and population structure of white spruce in Saskatchewan

Cited by 25 publications

References 35 publications

Genetic diversity and forest reproductive material - from seed source selection to planting

Genetic diversity and forest reproductive material - from seed source selection to planting

Genetic effects of forest management practices: Global synthesis and perspectives

SNP-based analysis reveals unexpected features of genetic diversity, parental contributions and pollen contamination in a white spruce breeding program

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