Population genetic diversity of the rare hardwood butternut (Juglans cinerea) in the northeastern USA

Boraks, A.; Broders, Kirk

doi:10.1007/s11295-016-1002-2

Cited by 9 publications

(5 citation statements)

References 38 publications

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“…They hypothesized that evidence of a single Bayesian group can be explained by recolonization of eastern black walnut from a single glacial refugium and high levels of gene flow and gene dispersal across wide geographical ranges [26]. Boraks and Broders found similar pattern of low genetic differentiation and high diversity in butternut (J. cinerea L.) populations [27]. They found that despite wide-range population collapse due to introduced fungal pathogen Ophiognomonia clavigignenti-juglandacearum (V.M.G.…”

Section: The Host Plant Speciesmentioning

confidence: 99%

“…Nair, Kostichka & J.E. Kuntz) Broders & Boland (Diaporthales: Gnomoniaceae), significant historical gene flow exists among butternut stands [27,28]. On the other hand, major shifts in population demography resulting from a rapid population decline can result in substantial loss of genetic diversity and increased genetic differentiation [29,30].…”

Section: The Host Plant Speciesmentioning

confidence: 99%

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Thousand Cankers Disease Complex: A Forest Health Issue that Threatens Juglans Species across the U.S.

Daniels

Nix

Wadl

et al. 2016

Forests

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Thousand Cankers Disease (TCD) is a disease complex wherein the fungus (Geosmithia morbida) is vectored by the walnut twig beetle (WTB, Pityophthorus juglandis). The disease causes mortality primarily of eastern black walnut (Juglans nigra), although other walnut and wingnut (Pterocarya) species are also susceptible. Black walnut is native to the Eastern and Midwestern U.S. but is widely planted in western states. Total standing volume in both urban and forested settings is approximately 96 million cubic meters, and is valued at $539 billion. Although native to the Southwestern U.S., the range of WTB has expanded considerably. The spread of G. morbida coincides with that of WTB. TCD was introduced into Tennessee in 2010, and has spread to seven eastern states. Trees infected with TCD exhibit drought-like symptoms, making field detection difficult without molecular and/or morphological methods. The recently sequenced G. morbida genome will provide valuable research tools focused on understanding gene interactions between organisms involved in TCD and mechanisms of pathogenicity. With no chemical treatments available, quarantine and sanitation are preeminent options for slowing the spread of TCD, although biological control agents have been discovered. High levels of black walnut mortality due to TCD will have far-reaching implications for both eastern and western states.

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Section: The Host Plant Speciesmentioning

confidence: 99%

Section: The Host Plant Speciesmentioning

confidence: 99%

Thousand Cankers Disease Complex: A Forest Health Issue that Threatens Juglans Species across the U.S.

Daniels

Nix

Wadl

et al. 2016

Forests

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“…However, no core collection has been developed for D. odorifera yet. Additionally, information on the genetic diversity and genetic variation of plant species has been well demonstrated using molecular markers [25,26,27,28], which are essential to core collection, germplasm identification, and breeding purposes [29]. Therefore, we conducted a comprehensive survey on genetic diversity and genetic variation for the database of 251 D. odorifera individuals using a set of 19 microsatellite markers, and developed a core collection using PowerCore software [30].…”

Section: Introductionmentioning

confidence: 99%

Genetic Diversity and Population Structure Analysis of Dalbergia Odorifera Germplasm and Development of a Core Collection Using Microsatellite Markers

Liu

Zhang

Liu

et al. 2019

Genes

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Dalbergia odorifera T. Chen (Fabaceae) is a woody tree species indigenous to Hainan Island in China. Due to its high medicinal and commercial value, this tree species has been planted over 3500 ha2 in southern China. There is an urgent need for improvement of the D. odorifera germplasm, however, limited information on germplasm collection, conservation, and assessment of genetic resources is available. Therefore, we have built a database of 251 individuals collected across the whole of southern China, which included 42 wild trees and 210 cultivated trees, with the following objectives. (1) Evaluate genetic diversity and population structure of the database using 19 microsatellite markers and (2) develop a core collection for improvement and breeding programs. Totally, the 19 microsatellite markers harbored 77 alleles across the database with the polymorphic information content (PIC) ranging from 0.03 to 0.66. Medium genetic diversity level was inferred by Nei’s gene diversity (0.38), Shannon’s information index (0.65), and observed (0.33) and expected heterozygosity (0.38). Structure analysis showed that four was the optimum cluster size using the model-based Bayesian procedure, and the 251 D. odorifera individuals were grouped into five populations including four pure ones (RP1-4) and one mixed one (MIX) based on their maximum membership coefficients. Among these populations, the expected heterozygosity varied from 0.30 (RP3) to 0.38 (RP4). Analysis of molecular variance (AMOVA) showed 11% genetic variation existed among populations, and moderate population differentiation was inferred by the matrix of pairwise Fst (genetic differentiation among populations), which was in the range of 0.031 to 0.095. Moreover, a core collection of 31 D. odorifera individuals including six wild and 25 cultivated trees was developed, which was only 12.4% of the database but conserved the whole genetic diversity. The results of this study provided additional insight into the genetic structure of the large D. odorifera germplasm, and the core collection will be useful for the efficient and sustainable utilization of genetic resources, as well as efficient improvement in breeding programs.

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“…Une meilleure conservation des individus potentiellement résistants au chancre a déjà été proposée et mise en place aux États-Unis (Boraks et Broders, 2016;Ostry et Woeste, 2004) et au Canada (Poisson et Ursic, 2013), à tout le moins dans quelques sites. On a suggéré d'utiliser des souches agressives et de les inoculer à l'automne pour tester la résistance des arbres les plus prometteurs (Ostry et Moore, 2008).…”

Section: Rétablissement De L'espèceunclassified

L’histoire d’un chancre menaçant d’exterminer le noyer cendré

Rioux¹,

Tanguay²,

Sambaraju³

et al. 2019

natcan

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Le noyer cendré (Juglans cinerea) est considéré depuis 2005 en voie de disparition au Canada; un chancre, causé par le champignon Ophiognomonia clavigignenti-juglandacearum, est la principale cause du statut précaire de l’espèce. Cette maladie, qui semble avoir été introduite en Amérique du Nord, a été initialement rapportée en 1967 au Wisconsin. Au Canada, c’est au Québec qu’on l’observe en premier en 1990. Les symptômes se présentent sous forme de mort en cime et, très souvent, de chancres au tronc qui finissent presque toujours par tuer les arbres de tous âges. Nous décrivons entre autres certains de nos travaux qui recherchaient une meilleure compréhension de cette maladie, mais surtout qui visaient à repérer des arbres potentiellement résistants au chancre, à les multiplier et à évaluer leur résistance, et finalement à les protéger en stimulant leur vigueur par des travaux de dégagement. Nous avons pu montrer, par exemple, qu’à la suite d’inoculations artificielles en serre, quelques noyers cendrés montraient une certaine résistance au chancre, et qu’ils se défendaient en compartimentant les tissus envahis par l’agent pathogène. Ces individus potentiellement résistants constitueraient ainsi une source unique de matériel pour rétablir l’espèce sur certains sites.

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Population genetic diversity of the rare hardwood butternut (Juglans cinerea) in the northeastern USA

Cited by 9 publications

References 38 publications

Thousand Cankers Disease Complex: A Forest Health Issue that Threatens Juglans Species across the U.S.

Thousand Cankers Disease Complex: A Forest Health Issue that Threatens Juglans Species across the U.S.

Genetic Diversity and Population Structure Analysis of Dalbergia Odorifera Germplasm and Development of a Core Collection Using Microsatellite Markers

L’histoire d’un chancre menaçant d’exterminer le noyer cendré

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