Genetic variation in trembling aspen in Ontario based on isozyme studies

Hyun, Jung Oh; Rajora, Om P.; Zsuffa, L.

doi:10.1139/x87-173

Cited by 42 publications

(29 citation statements)

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“…al 1994). Other studies based on isozyme data indicate that, within a given geographic area, variation among aspen individuals is much greater than variation among populations (Cheliak and Dancik 1982;Hyun et al 1987;Lund et al 1992). A relatively low amount of differentiation among populations in these studies suggests that a single breeding population may be adequate for aspen breeding in Alberta and Saskatchewan.…”

Section: Trembling Aspen Resourcesmentioning

confidence: 96%

Aspen improvement strategies for western Canada — Alberta and Saskatchewan

Li¹

1995

The Forestry Chronicle

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A breeding plan was developed for improving trembling aspen (Populus tremuloides) and aspen hybrids for fiber and wood production in Alberta and Saskatchewan. Phenotypic selections are being made from three major geographic regions, northern Alberta (55°-57° N, 114°-120° W), southern Alberta (53°-55° N 114°-120° W), and East-central Alberta and western Saskatchewan (54°-56° N, 107°-114° W). The initial breeding population will include 150 phenotypically selected individuals, 50 from each of the three regions. Open-pollinated seed will be collected and a provenance study will be established to examine the genetic variation in growth and adaptability across the regions. A simple recurrent breeding program for general combining ability will be implemented to improve pure trembling aspen. Initial breeding will be done within each of the three geographic regions until provenance information is available. A nested polycross mating design will be implemented to evaluate the selected parents and generate new breeding materials. Based on early measurements in progeny tests, outstanding parents will be selected to produce planting stock for operational planting. Selections for second generation breeding will be made at age 10 after wood quality and disease resistance can be evaluated reliably. A combined family- and within-family selection will be used to form a new breeding population. The initial focus of the hybrid breeding program will be to identify the interspecfic aspen hybrids that are suitable for planting in northern latitudes. Hybridization will concentrate on crosses between the local trembling aspen and northern sources of P. tremula and P. davidiana. Key words: aspen selection, breeding, hybridization, P. tremuloides, P. tremula and P. davidiana

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Section: Trembling Aspen Resourcesmentioning

confidence: 96%

Aspen improvement strategies for western Canada — Alberta and Saskatchewan

Li¹

1995

The Forestry Chronicle

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“…It is difficult to draw an informed decision on white spruce since we tested only one seed lot. The genetic variability of these species, suggests that emphasis be placed on intra-population sampling for both white spruce (King et al, 1984;Cheliak et al, 1985;Innes and Ringius, 1990) and aspen (Cheliak and Dancik, 1982;Hyun et al, 1987). Thus, it is worth testing more seed lots and families within-seed lots of these species to find the best suitable ones for CT revegetation.…”

Section: Dry Matter Production and Survivalmentioning

confidence: 99%

Genetic variability in salt tolerance of selected boreal woody seedlings

Khasa

Hambling

Kernaghan

et al. 2002

Forest Ecology and Management

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In order to select woody plant candidates suitable for revegetation of saline-alkaline soils, we tested selected woody plant species and seed lots: Pinus contorta (lodgepole pine), Pinus banksiana (jack pine), Picea glauca (white spruce), Populus tremuloides (trembling aspen), and Alnus rubra, syn. Alnus oregona (red alder). Pre-germinated seedlings were grown for 4 weeks in a greenhouse in a semi-hydroponic system containing 1/2 strength Hoagland solution with additional sodium concentrations (0, 25, 50, 75 mM) and composite tailings release water. A significant interaction between salt treatments and seed lots within plant species as well as between salt treatments and plant species was observed for weight and necrosis, indicating that the plant genotype responded differently to salt treatments. Of all examined woody plant species, jack pine (Syncrude seed source) exhibited the highest percent survival followed by white spruce (Syncrude seed source), red alder (seed lot No. 40457), and lodgepole pine (seed lot No. 7960007). Proportionately ranked means for dry biomass production showed lodgepole pine (seed lot No. 7960007) with the greatest biomass followed by aspen (seed lot No. Syncrude), red alder (seed lot No. Port Renfrew), jack pine (seed lot No. 8960049) and white spruce (Syncrude seed source). The best performing seed lots based on aggregation index which combines both the percent survival and dry weight averages were: red alder (seed lot Nos. 40457 and 45958), aspen (Syncrude seed source), jack pine (Syncrude seed source), lodgepole pine (seed lot No. 7960007). Based on variance components, most of the variation was explained by the treatment and seed lot effects. This reveals the importance of intra-specific variability and that selection should be based not only on inter-specific variation but also on the intra-specific variation for the development of salt-tolerant lines to be used in reclamation of saline habitats. #

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“…Recent studies (Cheliak and Dancik 1982;Hyun et a/., 1987) have shown that large genetic variations exist in aspen populations. This is not surprising since clonal differences have been shown to exist in suckering ability (Garrett andZakner 1964, Schier 1976), tree longevity (Schield and Bockheim 1981 ), productivity (Lehn and Higginbotham 1982) and disease resistance (Hiratsuka and Loman 1984).…”

Section: Tree Improvementmentioning

confidence: 99%

Regeneration Silviculture of Aspen

Doucet¹

1989

The Forestry Chronicle

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Factors affecting the regeneration of aspen are reviewed. In many cases, complete clearcutting will ensure prompt restocking at a satisfactory level without the need for further treatment. However aspen has traditionally been underutilized, and this led to the development of decadent stands. Special treatments may be needed to regenerate them. Moreover, aspen has such a large range that regional adaptations may be necessary for consistent success. Clonal differences have been used to a small extent to improve natural stands through silvicultural manipulations, but the potential of such techniques is low, as opposed to the use of genetic variations to develop more productive hybrids.

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Genetic variation in trembling aspen in Ontario based on isozyme studies

Cited by 42 publications

References 0 publications

Aspen improvement strategies for western Canada — Alberta and Saskatchewan

Aspen improvement strategies for western Canada — Alberta and Saskatchewan

Genetic variability in salt tolerance of selected boreal woody seedlings

Regeneration Silviculture of Aspen

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