Limited Genetic Variability in Native Buckwheats (Eriogonum: Polygonaceae) on San Clemente Island

Riley, Lynn; McGlaughlin, Mitchell E.; Helenurm, Kaius

doi:10.3398/064.078.0413

Cited by 3 publications

(4 citation statements)

References 89 publications

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“…This cascade of events that results from increased inbreeding is termed “inbreeding depression” [ 35 ]. For species that have lost large amounts of habitat and census numbers, it would be expected that considerable genetic diversity would also have been lost [ 35 , 41 ]. This can be particularly serious for self-incompatible species [ 35 ].…”

Section: Discussionmentioning

confidence: 99%

Monitoring Genetic Erosion of Aromatic and Medicinal Plant Species in Alentejo (South Portugal)

Póvoa

Lopes

Barata

et al. 2023

Plants

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The main goal of this work was to study the genetic erosion risk of plants with aromatic, medicinal and gastronomic applications in Portugal, particularly in the Alentejo region. The target species were coriander (Coriandrum sativum L.), hart’s pennyroyal (Mentha cervina L.) and pennyroyal (Mentha pulegium L.). The methodology involved direct observations and surveys (2002/2003 and 2011). The GE formula applied in Hammer’s studies was used to estimate genetic erosion. The main factors causing genetic erosion were the primary drivers of biodiversity loss: habitat loss, invasive species, and overexploitation influenced by human intervention such as the clearing of watercourses, vegetation control, grazing and desertification. The results indicate a reduction in individuals per species in Alentejo, with a net erosion loss of 11% for M. pulegium, 32% for M. cervina and 33% for C. sativum. The overall loss of accessions (genetic erosion risk) was higher in cultivated accessions (33%) than in wild accessions (11%), with an annual genetic erosion rate of 3.7% and 1.2%, respectively. The annual risk of genetic erosion for M. pulegium accessions collected in a natural habitat was 0.6%, which is much lower than the 3.7% for M. cervina. These results consolidate the importance of collecting and conserving genetic resources.

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Section: Discussionmentioning

confidence: 99%

Monitoring Genetic Erosion of Aromatic and Medicinal Plant Species in Alentejo (South Portugal)

Póvoa

Lopes

Barata

et al. 2023

Plants

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“…One exception is the support for designated varieties within E. corymbosum that is provided by AFLP loci (Ellis & al., 2009). Other genetic analyses have revealed low genetic variation in narrowly restricted varieties of some Eriogonum species, suggesting special conservation measures may be necessary (Riley & al., 2019). The greater sensitivity attained with thousands of SNP loci compared to other marker systems may also provide resolution of lineage structure where work with other markers has not, as with the lack of clear genetic support for lineage structure among morphologically distinguishable varieties in two species, E. ovalifolium and E. shockleyi (Archibald & al., 2001; J.F.…”

Section: Discussionmentioning

confidence: 99%

“…Smith & Bateman, 2002). In comparison, plastid and nuclear sequence variation provide evidence of negligible levels of gene flow among endemic Eriogonum populations on the California Channel Islands (Riley & al., 2016), and analysis of microsatellite variation indicates low genetic variation and population bottlenecks in a variety of E. giganteum on one of these islands (Riley & al., 2019). These results suggest that population genetic variation from several kinds of data do not consistently support the existence of evolutionary lineages that coincide with recognized taxa.…”

Section: Introductionmentioning

confidence: 99%

Genotyping‐by‐sequencing resolves relationships in Polygonaceae tribe Eriogoneae

Pearman

Alioto

Trotta

et al. 2021

TAXON

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The resolution of cryptic diversity is essential for understanding the evolutionary diversification of lineages and establishing conservation priorities. We examine relationships in Eriogoneae (Polygonaceae), a diverse lineage in western North America. We ask whether Eriogonum umbellatum, a morphologically and ecologically diverse species, is monophyletic and whether its varieties represent evolutionary lineages. We use genotyping‐by‐sequencing to assemble a SNP dataset for 51 species in the genera Chorizanthe, Eriogonum and Sidotheca. We report a hierarchical phylogenetic analysis using maximum likelihood to estimate the evolutionary history of Eriogoneae. We illustrate admixture components for 21 populations of E. umbellatum, representing four varieties, and test for lineage structure using TreeMix. We identify strongly supported clades within Eriogoneae. Many relationships in the Eucycla + Oregonium and Latifolia clades are supported, while most relationships within the Eriogonum subg. Oligogonum clade and a clade with most Chorizanthe remain unresolved. Eriogonum congdonii resolves within the main E. umbellatum clade, while populations of three varieties of E. umbellatum are closely related to E. ursinum and are associated with serpentine soils. ADmixture and TreeMix analyses suggest E. umbellatum varieties represent evolutionary lineages. These results from SNP data are largely consistent with previous phylogenetic studies of Eriogoneae based on sequence variation. Structure within Oligogonum suggests consistent environmental association and radiation after initial colonization of serpentine. Morphology is unreliable for the infraspecific taxonomy of E. umbellatum. Additional molecular studies are needed to resolve the evolutionary relationships and ecological diversification within this species, in Oligogonum, and in Eriogoneae.

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“…formosum, are self‐compatible, while others such as E. ovalifolium var . vineum are likely outcrossing (Neel et al, 2001; Riley et al, 2018). Age at first flowering in the wild is unknown, but under ideal field conditions, E. crosbyae plants can flower in as little as 2 years after germination (J. D. McClinton, unpublished data).…”

Section: Methodsmentioning

confidence: 99%

How specialized is a soil specialist? Early life history responses of a rare Eriogonum to site‐level variation in volcanic soils

McClinton

Torrence

Verburg

et al. 2020

American J of Botany

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PREMISE Understanding edaphic specialization is crucial for conserving rare plants that may need relocation due to habitat loss. Focusing on Eriogonum crosbyae, a rare soil specialist in the Great Basin of the United States, we asked how site‐level variation among volcanic soil outcrops affected plant growth and population distribution. METHODS We measured emergence, survival, size, and biomass allocation of E. crosbyae seedlings planted in soils collected from 42 outcrops of actual and potential habitat. We also measured phenotypic variation in the wild, documented abiotic and biotic components of E. crosbyae habitat, re‐surveyed Nevada populations, and evaluated occupancy changes over time. RESULTS Plants responded plastically to edaphic variation, growing larger and allocating relatively more to aboveground tissues in soils with greater nutrient availability and growing smaller in soils higher in copper in the field and the greenhouse. However, the chemical and physical soil properties we measured did not predict site occupancy, nor was plant phenotype in the greenhouse different when plants were grown in soils from sites with different occupation status. We observed occupation status reversals at five locations. CONCLUSIONS Eriogonum crosbyae performed well in soils formed on hydrothermally altered rocks that are inhospitable to many other plants. Extirpation/colonization events observed were consistent with metapopulation dynamics, which may partially explain the patchy distribution of E. crosbyae among outcrops of potential habitat. While soil properties did not predict site occupancy, early life stages showed sensitivity to soil variation, indicating that seedling dynamics may be important to consider for the conservation of this soil specialist.

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Limited Genetic Variability in Native Buckwheats (Eriogonum: Polygonaceae) on San Clemente Island

Cited by 3 publications

References 89 publications

Monitoring Genetic Erosion of Aromatic and Medicinal Plant Species in Alentejo (South Portugal)

Monitoring Genetic Erosion of Aromatic and Medicinal Plant Species in Alentejo (South Portugal)

Genotyping‐by‐sequencing resolves relationships in Polygonaceae tribe Eriogoneae

How specialized is a soil specialist? Early life history responses of a rare Eriogonum to site‐level variation in volcanic soils

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