Effects of maternal genotypic identity and genetic diversity of the red mangrove<i>Rhizophora mangle</i>on associated soil bacterial communities: A field‐based experiment

Craig, Hayley; Kennedy, John Paul; Devlin, Donna J.; Bardgett, Richard D.; Rowntree, Jennifer K.

doi:10.1002/ece3.6989

Cited by 12 publications

(10 citation statements)

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“…In addition, we know very little about the interactions with the microbiome in the species, but microbes have been highlighted as important symbionts in these and other challenging environments (Bowen et al, 2017; Jung et al, 2021). Moreover, a recent study in the Indian River Lagoon system, in St. Lucie County, Florida suggested that bacterial community composition differed among R. mangle maternal genotypes but not with genetic diversity (Craig et al, 2020). Increased warming as a consequence of climate change could result in either the relaxation or amplification of some of these biotic and abiotic limitations at range ends (Devaney et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Inheritance of DNA methylation differences in the mangroveRhizophora mangle

Mounger

Boquete

Schmid³

et al. 2021

Evolution and Development

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The capacity to respond to environmental challenges ultimately relies on phenotypic variation which manifests from complex interactions of genetic and nongenetic mechanisms through development. While we know something about genetic variation and structure of many species of conservation importance, we know very little about the nongenetic contributions to variation. Rhizophora mangle is a foundation species that occurs in coastal estuarine habitats throughout the neotropics where it provides critical ecosystem functions and is potentially threatened by anthropogenic environmental changes. Several studies have documented landscape‐level patterns of genetic variation in this species, but we know virtually nothing about the inheritance of nongenetic variation. To assess one type of nongenetic variation, we examined the patterns of DNA sequence and DNA methylation in maternal plants and offspring from natural populations of R. mangle from the Gulf Coast of Florida. We used a reduced representation bisulfite sequencing approach (epi‐genotyping by sequencing; epiGBS) to address the following questions: (a) What are the levels of genetic and epigenetic diversity in natural populations of R. mangle? (b) How are genetic and epigenetic variation structured within and among populations? (c) How faithfully is epigenetic variation inherited? We found low genetic diversity but high epigenetic diversity from natural populations of maternal plants in the field. In addition, a large portion (up to ~25%) of epigenetic differences among offspring grown in common garden was explained by maternal family. Therefore, epigenetic variation could be an important source of response to challenging environments in the genetically depauperate populations of this foundation species.

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Section: Discussionmentioning

confidence: 99%

Inheritance of DNA methylation differences in the mangroveRhizophora mangle

Mounger

Boquete

Schmid³

et al. 2021

Evolution and Development

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“…Soil microbial activity could have dramatic impacts on the future nutrient availability and stability of these coastal sediments (Deegan et al, 2012; Bowen et al, 2017; Hughes et al, 2020; Lewis et al, 2021). In fact, a recent study suggested that bacterial community composition differed among R. mangle maternal genotypes but not with genetic diversity (Craig et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Response to nitrogen and salinity in Rhizophora mangle propagules varies by maternal family and population of origin

Richards

Langanke²,

Mounger³

et al. 2021

Preprint

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Many coastal foundation plant species thrive across a range of environmental conditions, often displaying dramatic phenotypic variation in response to environmental variation. We characterized the response of propagules from six populations of the foundation species Rhizophora mangle L. to full factorial combinations of two levels of salt (15 ppt and 45 ppt) reflecting the range of salinity measured in the field populations, and two levels of nitrogen (N; no addition and amended at approximately 3 mg N per pot each week) equivalent to comparing ambient N to a rate of addition of 75 kg per hectare per year. The response to increasing salt included significant plasticity in succulence. Propagules also showed plasticity in maximum photosynthetic rate in response to N amendment, but the responses depended on the level of salt and varied by population of origin. Generally, survival was lower in high salt and high N, but the impact varied among populations. Overall, this study revealed significant phenotypic plasticity in response to salt and N level. Propagules from different populations differed in all traits measured. Variation in phenotypic plasticity and propagule survival in R. mangle may contribute to adaptation to a complex mosaic of environmental conditions and response to climate change.

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“…However, much more work is needed to understand how the genetic background of propagules used for replanting may influence the responses of these developing plants to the multiple interacting stressors common in mangrove systems (e.g., salinity, inundation, herbivory, irradiation) (Krauss et al, 2008). In addition, genetic variation within restoration plantings could shape the associated communities of organisms that colonise and inhabit these areas (Breed et al, 2018), with evidence that mangrove maternal genotype can influence soil microbial communities (Craig, Kennedy, Devlin, Bardgett, & Rowntree, 2020) and that genetic differences among mangrove hosts can correlate with the composition of endophytic fungal communities (Kennedy, Antwis, Preziosi, & Rowntree, accepted). Embedding in situ common garden experiments (as described in the previous section) into larger adaptive management experiments (Ellison, Felson, & Friess, 2020) could begin to uncover how intraspecific genetic variation may impact mangrove restoration and within which contexts these effects are most influential.…”

Section: Implications For Mangrove Rehabilitation and Restorationmentioning

confidence: 99%

Genetically-based adaptive trait shifts at an expanding mangrove range margin

Kennedy

Johnson

Preziosi

et al. 2021

Preprint

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Many species are expanding beyond their distributional range margins in response to a warming planet. Due to marginal environmental conditions and novel selection pressures, range margins may foster unique genetic adaptations that can better enable species to thrive under the extreme climatic conditions at and beyond their current distributional limits. Neotropical black mangrove (Avicennia germinans) is expanding poleward into temperate salt marsh along Atlantic Florida, USA, with field evidence of adaptive trait shifts within range-margin A. germinans populations. However, whether these adaptive shifts have a genetic basis remains to be answered. We monitored twenty A. germinans maternal cohorts from areas in both the Atlantic Florida range core and margin in a greenhouse common garden with annual temperatures analogous to range-margin conditions. We measured variation in a series of phenotypic traits starting at initial planting of field-collected propagules and continuing until two years development. Maternal cohorts from the Atlantic Florida range margin consistently outperformed those from the range core throughout the experiment. Range-margin cohorts survived in greater numbers, established faster, and were less stressed under winter chilling and sub-zero temperatures that are often reached at the Atlantic range margin, but not within the range core. Range-margin cohorts did not grow taller, but instead invested more into lateral growth and biomass accumulation that presumably reflects adaptation to their colder and open canopy environment. Range-margin cohorts also exhibited leaf traits consistent with greater resource acquisition that may compensate for a shorter growing season and reduced light quality at higher latitude. Synthesis: We confirmed that there is a genetic basis to adaptive trait shifts towards an expanding mangrove range margin. Our results suggest that genetically-based phenotypic differences better enable these range-margin mangroves to thrive within their stressful environment and may facilitate further poleward expansion in the future. In addition, our documentation of adaptive trait variation among maternal cohorts of an ecologically-important mangrove foundation species, quantitative data that is lacking for mangroves, should help inform mangrove restoration initiatives.

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Effects of maternal genotypic identity and genetic diversity of the red mangroveRhizophora mangleon associated soil bacterial communities: A field‐based experiment

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 12 publications

References 78 publications

Inheritance of DNA methylation differences in the mangroveRhizophora mangle

Inheritance of DNA methylation differences in the mangroveRhizophora mangle

Response to nitrogen and salinity in Rhizophora mangle propagules varies by maternal family and population of origin

Genetically-based adaptive trait shifts at an expanding mangrove range margin

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