Limit theorems and a general framework for risk analysis in clonal forestry

Bishir, John; Roberds, James H.

doi:10.1016/s0025-5564(96)00184-8

Cited by 8 publications

(2 citation statements)

References 4 publications

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“…OPTS showed, however, a selection effort that involved a larger number of families and sublines, widening of the genetic base, and diversity. This is extremely important to consider for purposes related to deployment and risk of losing plantations (e.g., Bishir and Roberds 1997;Yanchuk et al 2006). However, even with OPTS, there are some decisions to be made by the tree breeder considering specific circumstances.…”

Section: Discussionmentioning

confidence: 99%

Gain and diversity in advanced generation coastal Douglas-fir selections for seed production populations

Stoehr¹,

Yanchuk²,

Xie³

et al. 2007

Tree Genetics & Genomes

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Sublines are used in the third-generation breeding and testing of coastal Douglas-fir in British Columbia, with the original intent of selecting only one genotype per subline for production populations (e.g., seed orchards) to eliminate relatedness among parents (therein called "1/ SL"). We evaluated three additional selection scenarios that did not consider the subline structure. One of the scenarios strictly selected on the basis of the highest breeding values of the trees ("TOP"); another scenario used the TOP selections, but assigned the number of ramets per selection proportionally to the selection breeding value ("LIND"); lastly, a simulated annealing technique was applied to maximize gain under explicit constraints on coancestry ("OPTS"). All three alternative selection scenarios resulted in some relatedness and coancestry among selections, but the last two provided increases in average breeding values compared to those obtained by the 1/SL scenario. Effective population sizes (and consequently inbreeding coefficients) varied among the three selection scenarios. Effects of the various selections on merchantable volume at rotation age were determined using a linear regression model based on an individual tree model (TASS), which was first run to determine the relationship between merchantable volume and inbreeding (f). LIND and TOP selections yielded the highest breeding values but, due to the increased coancestry among selections, paid a penalty in the merchantable volume determination. OPTS maximized merchantable volume at rotation age 60 after including more than 13 selections with an increase of around 3% over that obtained by the 1/SL selection scenario, with an associated increase in Ne of 50%. Other implications of the three alternative selection scenarios are discussed.

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Section: Discussionmentioning

confidence: 99%

Gain and diversity in advanced generation coastal Douglas-fir selections for seed production populations

Stoehr¹,

Yanchuk²,

Xie³

et al. 2007

Tree Genetics & Genomes

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“…Considerable current efforts are being made in both agricultural and forestry systems to combat the risk by broadening the genetic base of crops and forest trees (Burdon 2001), planting crops as mixtures rather than monocultures (Zhu et al . 2000), using multiple rather than single clones in clonal forestry systems (Bishir & Roberds 1997) and using plant breeding and transgene technology to create multigene resistance in a single genotype (Burdon 2001).…”

Section: Discussionmentioning

confidence: 99%

Comparative genetic study confirms exceptionally low genetic variation in the ancient and endangered relictual conifer, Wollemia nobilis (Araucariaceae)

et al. 2003

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The Wollemi pine, Wollemia nobilis (Araucariaceae), was discovered in 1994 as the only extant member of the genus, previously known only from the fossil record. With fewer than 100 trees known from an inaccessible canyon in southeastern Australia, it is one of the most endangered tree species in the world. We conducted a comparative population genetic survey at allozyme, amplified fragment length polymorphism (AFLP) and simple sequence repeat (SSR) loci in W. nobilis, Araucaria cunninghamii and Agathis robusta - representatives of the two sister genera. No polymorphism was detected at 13 allozyme loci, more than 800 AFLP loci or the 20 SSR loci screened in W. nobilis. In Ag. robusta only one of 12 allozyme loci, five of 800 AFLP loci and none of the 15 SSR loci were variable. For A. cunninghamii, 10 of > 800 AFLP loci and five of 20 SSR loci were variable. Thus low genetic diversity characterizes all three species. While not ruling out the existence of genetic variation, we conclude that genetic diversity is exceptionally low in the Wollemi pine. To our knowledge this is the most extreme case known in plants. We conclude that the combination of small population effects, clonality and below-average genetic variation in the family are probable contributing factors to the low diversity. The exceptionally low genetic diversity of the Wollemi pine, combined with its known susceptibility to exotic fungal pathogens, reinforces current management policies of strict control of access to the pines and secrecy of the pine locations.

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Impact of a tree improvement program on the genetic diversity of sugi (Cryptomeria japonica D Don) plantations

Iwasaki

Uchiyama

Kimura

et al. 2019

Forest Ecology and Management

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Limit theorems and a general framework for risk analysis in clonal forestry

Cited by 8 publications

References 4 publications

Gain and diversity in advanced generation coastal Douglas-fir selections for seed production populations

Gain and diversity in advanced generation coastal Douglas-fir selections for seed production populations

Comparative genetic study confirms exceptionally low genetic variation in the ancient and endangered relictual conifer, Wollemia nobilis (Araucariaceae)

Impact of a tree improvement program on the genetic diversity of sugi (Cryptomeria japonica D Don) plantations

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