THE ORGANIZATION OF GENETIC VARIABILITY IN CENTRAL AND MARGINAL POPULATIONS OF LODGEPOLE PINE<i>PINUS CONTORTA</i>spp.<i>LATIFOLIA</i>

Yeh, Francis C.; Layton, Charles R.

doi:10.1139/g79-054

Cited by 139 publications

(84 citation statements)

References 19 publications

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“…The lack of a correlation between genetic and geographic distances detected here is consistent with previous isozyme studies that showed significant geographic variation only over a much wider range of the species distribution (Yeh andLayton 1979, Yeh et al 1985). Yeh et al (1985) suggested that altitudinal variation may be important at a small scale, but our sampling was not intensive enough to test this aspect.…”

Section: Discussionsupporting

confidence: 92%

Allozyme variation in natural populations of Picea asperata

Luo¹,

Wang²,

Korpelainen³

et al. 2005

Silva Fenn.

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A survey of allozymic alleles and genetic diversity was conducted for ten natural populations of Picea asperata Mast. originating from the mountains of Southwest China. A total of twenty-seven alleles at seventeen loci were observed. Ten of the loci were found monomorphic. Our results showed that the populations sampled were characterized by low genetic diversity (mean He = 0.096) and a low level of inbreeding (mean Fis = 0.005). The UPGMA tree of genetic relationships indicated that there was significant differentiation among populations. The coefficient of genetic differentiation among populations, based on Fst, equaled 0.311. Such extensive inter-populational differentiation detected in P. asperata could have resulted from allele frequency divergence among populations, particularly, in one population. Introgression from another species, variation in environmental conditions, and differing selection pressures could be some of the factors attributing to significant differences among populations. In addition, our results showed that the geographic and genetic distances were not correlated in the populations of P. asperata. Based on the genetic information obtained, we concluded that monitoring appropriate genetic markers may be an effective means of identifying potential genetic changes occurring during forest tree evolution.

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Section: Discussionsupporting

confidence: 92%

Allozyme variation in natural populations of Picea asperata

Luo¹,

Wang²,

Korpelainen³

et al. 2005

Silva Fenn.

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“…Molecular markers are also valuable tools for providing information about mating systems and gene dispersal (Adams 1992), the importance of random processes in the geographic structure of populations (Adams and Campbell 1981), and the interrelationship between population structure and genetic variability (Yeh and Layton 1979).…”

Section: Molecular Markersmentioning

confidence: 99%

Pacific Northwest Forest Tree Seed Zones: A Template for Native Plants?

Johnson¹,

Sorensen²,

Clair³

et al. 2004

Native Plants Journal

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Seed movement guidelines for restoration activities are lacking for most native grasses, forbs, and shrubs. The forestry community has decades of experience in establishing seed zones and seed movement guidelines that may be of value to restoration managers. We review the history of seed zone development in forest trees, with emphasis on the Pacific Northwest, and make some suggestions concerning seed transfer guidelines for other native plants. K E Y W O R D Sseed movement, genetic variation, adaptation ITIS (2002)he forestry community has been restoring, replanting, and reforesting lands with native tree species for decades in North America and for centuries in Europe. This work and early provenance tests show large amounts of source-related genetic variation within species for traits that are associated with adaptation, such as growth traits, cold hardiness, and phenology. As a consequence, the forestry community in the US Pacific Northwest (Oregon and Washington) initiated forest tree seed certification and a system of seed zones in the 1960s. These seed zones have been modified over time to incorporate new research information. Although adaptive variation in forest trees is usually continuous across the landscape, zones with distinct boundaries generally have been used to control seed use for administrative reasons. A seed zone is a mapped area with fixed boundaries in which seeds or plant materials can be transferred with minimal risk of maladaptation and, this is important in forestry, with minimal risk of a loss in productivity. Continuous zones, or seed transfer guidelines, are similar in that they recommend how far seeds can be transferred from point of origin, and describe the relative risk associated with that transfer.

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“…Lodgepole pine is a long-lived, highly outcrossed conifer (Yeh & Layton 1979) with an extensive range spanning climatically heterogeneous mountain environments and relatively homogenous valleys and plateaus from Baja California to the Yukon Territories and Alaska. Adaptation to the climatic variations across this range requires tradeoffs between maximizing growth rate and tailoring phenology to avoid exposing sensitive growing tissues to extreme environmental conditions (Howe et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Regional heterogeneity and gene flow maintain variance in a quantitative trait within populations of lodgepole pine

Yeaman

Jarvis

2006

Proc. R. Soc. B.

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Genetic variation is of fundamental importance to biological evolution, yet we still know very little about how it is maintained in nature. Because many species inhabit heterogeneous environments and have pronounced local adaptations, gene flow between differently adapted populations may be a persistent source of genetic variation within populations. If this migration-selection balance is biologically important then there should be strong correlations between genetic variance within populations and the amount of heterogeneity in the environment surrounding them. Here, we use data from a long-term study of 142 populations of lodgepole pine (Pinus contorta) to compare levels of genetic variation in growth response with measures of climatic heterogeneity in the surrounding region. We find that regional heterogeneity explains at least 20% of the variation in genetic variance, suggesting that gene flow and heterogeneous selection may play an important role in maintaining the high levels of genetic variation found within natural populations.

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THE ORGANIZATION OF GENETIC VARIABILITY IN CENTRAL AND MARGINAL POPULATIONS OF LODGEPOLE PINEPINUS CONTORTAspp.LATIFOLIA

Cited by 139 publications

References 19 publications

Allozyme variation in natural populations of Picea asperata

Allozyme variation in natural populations of Picea asperata

Pacific Northwest Forest Tree Seed Zones: A Template for Native Plants?

Regional heterogeneity and gene flow maintain variance in a quantitative trait within populations of lodgepole pine

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