Selection for resistance to white pine blister rust affects the abiotic stress tolerances of limber pine

Vogan, Patrick J.; Schoettle, Anna W.

doi:10.1016/j.foreco.2015.01.029

Cited by 26 publications

(26 citation statements)

References 54 publications

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“…Climatic clines of admixture and environmentally-dependent maintenance of hybrid zones have been noted in other species of woody perennials in the genera Quercus (Dodd & Afzal-Rafii 2004), Picea (Hamilton et al 2013; De La Torre et al 2014b), Rhododendron (Milne et al 2003), and Pinus (Cullingham et al 2014). An important variable unaccounted for in our study, however, is white pine blister rust infestation ( Cronartium ribicola Fisch J.C), which influences stand dynamics of both species (Looney & Waring 2013) and drives trade-offs between drought-tolerance and resistance in P. flexilis (Vogan & Schoettle 2015). However, given the low and recent incidence of infestation (Looney et al 2015), it is unlikely that C. ribicola contributed towards niche divergence of the focal taxa.…”

Section: Discussionmentioning

confidence: 99%

The role of hybridization during ecological divergence of southwestern white pine (Pinus strobiformis) and limber pine (P. flexilis)

Menon

Bagley

Friedline

et al. 2017

Preprint

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Interactions between extrinsic factors, such as disruptive selection, and intrinsic factors, such as genetic incompatibilities among loci, can contribute to the maintenance of species boundaries. The relative roles of these factors in the establishment of reproductive isolation can be examined using species pairs characterized by gene flow throughout their divergence history. We investigated the process of speciation and the maintenance of species boundaries between Pinus strobiformis and P.flexilis. Utilizing ecological niche modeling, demographic modeling, and genomic cline analyses, we illustrated a history of divergence with continuous gene flow between these species. We found an abundance of advanced generation hybrids and a lack of loci exhibiting large allele frequency differences across the hybrid zone. Additionally, we found evidence for climate-associated variation in the hybrid index and niche divergence between parental species and the hybrid zone. Our results are consistent with extrinsic factors, such as climate, being an important isolating mechanism for these species. A buildup of intrinsic incompatibilities and of co-adapted gene complexes is also apparent in our results, although these appear to be in the earliest stages of development. This supports previous work in coniferous species demonstrating the importance of extrinsic factors in creating and enforcing species boundaries. Overall, we lend support to the hypothesis that varying strengths and directions of selection pressures across the long lifespans of conifers, in combination with their life history strategies, delay the evolution of strong intrinsic incompatibilities.

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Section: Discussionmentioning

confidence: 99%

The role of hybridization during ecological divergence of southwestern white pine (Pinus strobiformis) and limber pine (P. flexilis)

Menon

Bagley

Friedline

et al. 2017

Preprint

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“…The results reported here echo those of other studies on the consequences of selection for single traits. For example, a recent study utilizing plant families resistant or susceptible to white pine blister rust (WPBR), a disease caused by the pathogenic fungus Cronartium ribicola, found that limber pine (Pinus flexilis) seedlings grown from openpollinated seed trees known to be either resistant or susceptible to WPBR showed differences in stress tolerance traits, whether or not they had been exposed to the fungal pathogen (Vogan & Schoettle, 2015). Similarly, in a study examining the impact of over 60 years of selective breeding for higher yield in soya beans, Kiers, Hutton, and Denison (2007) found that older soya bean genotypes had higher fitness (measured as seed production) compared to newer genotypes, when exposed to a rhizobia inoculum containing both effective and ineffective strains of the N fixing bacteria.…”

Section: Consequences Of Trait Correlationsmentioning

confidence: 99%

Genetically determined fungal pathogen tolerance and soil variation influence ectomycorrhizal traits of loblolly pine

Piculell

Eckhardt

Hoeksema

2018

Ecology and Evolution

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Selection on genetically correlated traits within species can create indirect effects on one trait by selection on another. The consequences of these trait correlations are of interest because they may influence how suites of traits within species evolve under differing selection pressures, both natural and artificial. By utilizing genetic families of loblolly pine either tolerant (t) or susceptible (s) to two different suites of pathogenic fungi responsible for causing either pine decline or fusiform rust disease, we investigated trait variation and trait correlations within loblolly pine (Pinus taeda L.) by determining how ectomycorrhizal (EM) colonization relates to pathogen susceptibility. We detected interactions between susceptibility to pathogenic fungi and soil inoculation source on loblolly pine compatibility with the EM fungi Thelephora, and on relative growth rate of loblolly pine. Additionally, we detected spatial variation in the loblolly pine–EM fungi interaction, and found that variation in colonization rates by some members of the EM community is not dictated by genetic variation in the host plant but rather soil inoculation source alone. The work presented here illustrates the potential for indirect selection on compatibility with symbiotic EM fungi as a result of selection for resistance to fungal pathogens. Additionally, we present evidence that the host plant does not have a single “mycorrhizal trait” governing interactions with all EM fungi, but rather that it can interact with different fungal taxa independently. Synthesis. An understanding of the genetic architecture of essential traits in focal species is crucial if we are to anticipate and manage the results of natural and artificial selection. As demonstrated here, an essential but often overlooked symbiosis (that between plants and mycorrhizal fungi) may be indirectly influenced by directed selection on the host plant.

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“…This modeling framework can be used to explore the potential and limitations of artificial selection to increase productivity in a managed forest environment, by identifying optimal combinations of traits for a given goal and explicitly relating expected productivity gains to changes in tree vulnerability to biotic and abiotic risks in various environmental conditions. Using a similar framework, selection for qualitative disease resistance in limber pine has been shown to alter trees' drought and temperature tolerances, potentially changing their environmental range (Vogan and Schoettle 2015).…”

Section: Disease Resistance: Revisiting the Ideotype Concept For Breementioning

confidence: 99%

An evolutionary ecology perspective to address forest pathology challenges of today and tomorrow

Desprez-Loustau

Aguayo²,

Dutech

et al. 2016

Annals of Forest Science

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Abstract& Key message Increasing human impacts on forests, including unintentional movement of pathogens, climate change, and large-scale intensive plantations, are associated with an unprecedented rate of new diseases. An evolutionary ecology perspective can help address these challenges and provide direction for sustainable forest management.& Context Forest pathology has historically relied on an ecological approach to understand and address the practical management of forest diseases. A widening of this perspective to include evolutionary considerations has been increasingly developed in response to the rising rates of genetic change in both pathogen populations and tree populations due to human activities. & Aims Here, five topics for which the evolutionary perspective is especially relevant are highlighted. & Results The first relates to the evolutionary diversity of fungi and fungal-like organisms, with issues linked to the identification of species and their ecological niches. The second theme deals with the evolutionary processes that allow forest pathogens to adapt to new hosts after introductions or to become more virulent in homogeneous plantations. The third theme presents issues linked to disease resistance in tree breeding programs (e.g., growth-defense trade-offs) and proposes new criteria and methods for more durable resistance. The last two themes are dedicated to the biotic environment of the tree-pathogen system, namely, hyperparasites and tree microbiota, as possible solutions for health management. & Conclusion We conclude by highlighting three major conceptual advances brought by evolutionary biology, i.e., that (i) "not everything is everywhere", (ii) evolution of pathogen populations can occur on short time scales, and (iii) the tree is a multitrophic community. We further translate these into a framework for immediate policy recommendations and future directions for research.

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Selection for resistance to white pine blister rust affects the abiotic stress tolerances of limber pine

Cited by 26 publications

References 54 publications

The role of hybridization during ecological divergence of southwestern white pine (Pinus strobiformis) and limber pine (P. flexilis)

The role of hybridization during ecological divergence of southwestern white pine (Pinus strobiformis) and limber pine (P. flexilis)

Genetically determined fungal pathogen tolerance and soil variation influence ectomycorrhizal traits of loblolly pine

An evolutionary ecology perspective to address forest pathology challenges of today and tomorrow

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