Genetically-based trait variation within a foundation tree species influences a dominant bark lichen

Lamit, Louis J.; Bowker, Matthew A.; Holeski, Liza M.; Næsborg, Rikke Reese; Wooley, Stuart C.; Zinkgraf, Matthew S.; Lindroth, Richard L.; Whitham, Thomas G.; Gehring, Catherine A.

doi:10.1016/j.funeco.2010.09.007

Cited by 18 publications

(17 citation statements)

References 39 publications

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“…Plant genomes seem to be especially tolerant of hybridization (Rieseberg, ; Soltis & Soltis, ; Suarez‐Gonzalez, Lexer, & Cronk, ; Whitney, Ahern, Campbell, Albert, & King, ), and the increase in trait variability can translate into community‐level consequences for plant–herbivore or plant–microbe associations (Evans, Allan, & Whitham, ; Floate, Godbout, Lau, Isabel, & Whitham, ; Lamit et al., ). Selection may also act on this increased variance to drive introgression of genomic regions between parental species, opening up physiological niches unavailable to either parental species and permitting expansion into new habitats by increasing niche breadth or stress tolerance (Goulet, Roda, & Hopkins, ; Rieseberg et al., ; Whitney et al., ).…”

Section: Introductionmentioning

confidence: 99%

Adaptive introgression and maintenance of a trispecies hybrid complex in range‐edge populations of Populus

et al. 2018

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In hybrid zones occurring in marginal environments, adaptive introgression from one species into the genomic background of another may constitute a mechanism facilitating adaptation at range limits. Although recent studies have improved our understanding of adaptive introgression in widely distributed tree species, little is known about the dynamics of this process in populations at the margins of species ranges. We investigated the extent of introgression between three species of the genus Populus sect. Tacamahaca (P. balsamifera, P. angustifolia and P. trichocarpa) at the margins of their distributions in the Rocky Mountain region of the United States and Canada. Using genotyping by sequencing (GBS), we analysed ~ 83,000 single nucleotide polymorphisms genotyped in 296 individuals from 29 allopatric and sympatric populations of the three species. We found a trispecies hybrid complex present throughout the zone of range overlap, including early as well as advanced generation backcross hybrids, indicating recurrent gene flow in this hybrid complex. Using genomic cline analysis, we found evidence of non-neutral patterns of introgression at 23% of loci in hybrids, of which 47% and 8% represented excess ancestry from P. angustifolia and P. balsamifera, respectively. Gene ontology analysis suggested these genomic regions were enriched for genes associated with photoperiodic regulation, metal ion transport, maintenance of redox homeostasis and cell wall metabolites involved in regulation of seasonal dormancy. Our study demonstrates the role of adaptive introgression in a multispecies hybrid complex in range-edge populations and has implications for understanding the evolutionary dynamics of adaptation in hybrid zones, especially at the margins of species distributions.

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Section: Introductionmentioning

confidence: 99%

Adaptive introgression and maintenance of a trispecies hybrid complex in range‐edge populations of Populus

et al. 2018

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“…Epiphyte community dynamics take place on living trees with genetically based phenotypes; genetic variation in host traits may therefore influence lichen community assembly and succession (Ellis and Coppins 2007, Lamit et al 2011a, Davies et al 2014. Many tree species exhibit a developmental shift in bark texture from smooth to coarse and furrowed with age (Borger 1973, Hoffman and Boe 1977, Johansson et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Many tree species exhibit a developmental shift in bark texture from smooth to coarse and furrowed with age (Borger 1973, Hoffman and Boe 1977, Johansson et al 2007). Variation in bark texture among genotypes of the same age (e.g., Lamit et al 2011a) indicates that the timing of the ontogenetic shift from smooth to rough is under genetic control, and lichens may be influenced by this genetic variation in bark ontogeny. Furthermore, environmental conditions can modulate the expression of genetically variable plant traits, and these genotype by environment (G 3 E) interactions can affect plantassociated communities (e.g., Orians and Fritz 1996, Johnson and Agrawal 2005, Davies et al 2014.…”

Section: Introductionmentioning

confidence: 99%

Genotype variation in bark texture drives lichen community assembly across multiple environments

Lamit

Lau

Næsborg

et al. 2015

Ecology

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A major goal of community genetics is to understand the influence of genetic variation within a species on ecological communities. Although well-documented for some organisms, additional research is necessary to understand the relative and interactive effects of genotype and environment on biodiversity, identify mechanisms through which tree genotype influences communities, and connect this emerging field with existing themes in ecology. We employ an underutilized but ecologically significant group of organisms, epiphytic bark lichens, to understand the relative importance of Populus angustifolia (narrowleaf cottonwood) genotype and environment on associated organisms within the context of community assembly and host ontogeny. Several key findings emerged. (1) In a single common garden, tree genotype explained 18-33% and 51% of the variation in lichen community variables and rough bark cover, respectively. (2) Across replicated common gardens, tree genotype affected lichen species richness, total lichen cover, lichen species composition, and rough bark cover, whereas environment only influenced composition and there were no genotype by environment interactions. (3) Rough bark cover was positively correlated with total lichen cover and richness, and was associated with a shift in species composition; these patterns occurred with variation in rough bark cover among tree genotypes of the same age in common gardens and with increasing rough bark cover along a -40 year tree age gradient in a natural riparian stand. (4) In a common garden, 20-year-old parent trees with smooth bark had poorly developed lichen communities, similar to their 10-year-old ramets (root suckers) growing in close proximity, while parent trees with high rough bark cover had more developed communities than their ramets. These findings indicate that epiphytic lichens are influenced by host genotype, an effect that is robust across divergent environments. Furthermore, the response to tree genotype is likely the result of genetic variation in the timing of the ontogenetic shift from smooth to rough bark allowing communities on some genotypes to assemble faster than those on other genotypes. Organisms outside the typical sphere of community genetics, such as lichens, can help address critical issues and connect plant genotype effects to long-established streams of biological research, such as ontogeny and community assembly.

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“…In the past, [21] also found that it is often visually obvious that colonization is more extensive on rough and porous surfaces than smooth, non-porous ones. Lichen studies also showed the rough bark also provides a greater opportunity for thallus fragments of lichens to embed in its surface [22].…”

Section: Discussionmentioning

confidence: 99%

Bark Roughness as A Factor Affecting Cell Density Of Epiphytic Microalgae (Apatococcus Sp)

2015

May 13-14, 2015 Kuala Lumpur, Malaysia

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Genetically-based trait variation within a foundation tree species influences a dominant bark lichen

Cited by 18 publications

References 39 publications

Adaptive introgression and maintenance of a trispecies hybrid complex in range‐edge populations of Populus

Adaptive introgression and maintenance of a trispecies hybrid complex in range‐edge populations of Populus

Genotype variation in bark texture drives lichen community assembly across multiple environments

Bark Roughness as A Factor Affecting Cell Density Of Epiphytic Microalgae (Apatococcus Sp)

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