Evolution and conservation genetics of an insular hemiparasitic plant lineage at the limit of survival: the case of <i>Thesium</i> sect. <i>Kunkeliella</i> in the Canary Islands

Rodríguez-Rodríguez, Priscila; Castro, Alejandro G. Fernández de; Páz, Pedro Luís Pérez de; Curbelo, Leticia; Palomares, Ángel; Mesa, Ricardo; ACEVEDO, AURELIO; Sosa, Pedro A.

doi:10.1002/ajb2.1830

Cited by 6 publications

(4 citation statements)

References 63 publications

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“…However, Rodríguez‐Rodríguez & al. (2022) found enough genetic variation based on microsatellite markers to consider them different species, a conclusion also supported by morphology. On Tenerife, all the species have stems covered with an indument of tiny hairs, whereas T. canariense (Stearn) J.C.Manning & F.Forest, endemic to Gran Canaria Island, is glabrous.…”

Section: Discussionmentioning

confidence: 79%

“…The three ITS clones of T. subsucculentum (A, B, C) and two clones of T. retamoides (A, B) were not monophyletic based on species. However, Rodríguez-Rodríguez & al. (2022) found enough genetic variation based on microsatellite markers to consider them different species, a conclusion also supported by morphology.…”

Section: Phylogenetic Relationships Taxonomy and Morphological Charac...mentioning

confidence: 99%

“…Our data indicate that T. sect. Kunkeliella is monophyletic and its presence in the Canary Islands is the result of a single dispersal event followed by local in situ diversification in the islands with one species in Gran Canaria, three in Tenerife and one in La Palma (Rodríguez-Rodríguez & al., 2022).…”

Section: Biogeography Of Thesiummentioning

confidence: 99%

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A tough nutlet to crack: Resolving the phylogeny of Thesium (Thesiaceae), the largest genus in Santalales

García,

Mucina,

Nickrent

2024

TAXON

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With over 350 species, Thesium is the largest genus in Santalales. It is found on all continents except Antarctica; however, its highest diversity is in the Cape Floristic Region of South Africa where approximately half the species occur. Thesium samples of ca. 590 collections from throughout its entire geographic range were obtained and nuclear ribosomal ITS sequenced from 396 accessions representing 196 named taxa and 30 currently unnamed taxa for a total of ca. 230 species. In addition, two chloroplast genome spacers (trnDT, trnLF) were sequenced from 269 and 315 accessions, respectively. Maximum parsimony, maximum likelihood and Bayesian methods were employed to generate gene trees and infer phylogenies. The value of the morphological characters traditionally used in the taxonomy of the genus and previous infrageneric classifications are discussed. Broad scale relationships were generally congruent among the ITS and the chloroplast trees. For example, both the nuclear and chloroplast trees support the presence of Eurasian and African clades. In contrast, major incongruence was detected between nuclear and chloroplast trees for a number of taxa including the recently described T. nautimontanum that is sister to the entire African clade on the ITS tree. Although the causes of this incongruence are currently unknown, a novel form of chloroplast capture is hypothesized. A hypothesis of the biogeographical history of the genus based on our molecular phylogeny is presented.

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Section: Discussionmentioning

confidence: 79%

Section: Phylogenetic Relationships Taxonomy and Morphological Charac...mentioning

confidence: 99%

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A tough nutlet to crack: Resolving the phylogeny of Thesium (Thesiaceae), the largest genus in Santalales

García,

Mucina,

Nickrent

2024

TAXON

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“…Parajubaea , therefore, is among the endangered plant species (e.g. Dalapicolla et al., 2021 ; Rodríguez‐Rodríguez et al., 2022 ), and self‐incompatible dioecious or monoecious plants (e.g. Allendorf & Luikart, 2007 ; Balloux, 2004 ) that exhibit heterozygosity excess.…”

Section: Discussionmentioning

confidence: 99%

Genotyping‐by‐sequencing informs conservation of Andean palms sources of non‐timber forest products

Peñafiel Loaiza,

Chafe,

Moraes R

et al. 2024

Evolutionary Applications

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Conservation and sustainable management of lineages providing non‐timber forest products are imperative under the current global biodiversity loss. Most non‐timber forest species, however, lack genomic studies that characterize their intraspecific variation and evolutionary history, which inform species' conservation practices. Contrary to many lineages in the Andean biodiversity hotspot that exhibit high diversification, the genus Parajubaea (Arecaceae) has only three species despite the genus' origin 22 million years ago. Two of the three palm species, P. torallyi and P. sunkha, are non‐timber forest species endemic to the Andes of Bolivia and are listed as IUCN endangered. The third species, P. cocoides, is a vulnerable species with unknown wild populations. We investigated the evolutionary relationships of Parajubaea species and the genetic diversity and structure of wild Bolivian populations. Sequencing of five low‐copy nuclear genes (3753 bp) challenged the hypothesis that P. cocoides is a cultigen that originated from the wild Bolivian species. We further obtained up to 15,134 de novo single‐nucleotide polymorphism markers by genotyping‐by‐sequencing of 194 wild Parajubaea individuals. Our total DNA sequencing effort rejected the taxonomic separation of the two Bolivian species. As expected for narrow endemic species, we observed low genetic diversity, but no inbreeding signal. We found three genetic clusters shaped by geographic distance, which we use to propose three management units. Different percentages of missing genotypic data did not impact the genetic structure of populations. We use the management units to recommend in situ conservation by creating new protected areas, and ex situ conservation through seed collection.

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Evolution and conservation genetics of an insular hemiparasitic plant lineage at the limit of survival: the case of Thesium sect. Kunkeliella in the Canary Islands

Rodríguez-Rodríguez

Castro

Páz

et al. 2022

American J of Botany

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Premise The diversification of island flora has been widely studied. However, the role of environmental niches in insular radiation processes has been less investigated. We combined population genetic analyses with species distribution modelling to clarify the genetic relationships, diversification patterns, species niche requirements, and conservation of Thesium sect. Kunkeliella, a clade of rare hemiparasitic plants endemic to the Canaries. Methods We studied the three extant Thesium species and a new taxon from La Palma Island. We developed 12 microsatellites and performed population genetic analysis and studied the demographic history of the group. To evaluate the role of niche conservatism in the diversification of the group, we performed species distribution modelling (ESM) with four algorithms. Results All species presented moderate genetic diversity values for rare endemics. Thesium canariense (Gran Canaria) showed high differentiation, whereas T. subsucculentum, T. retamoides (Tenerife), and La Palma populations are closely related. The lineage may have undergone a recent diversification with colonization proceeding east to west, with T. canariense as sister to the others. We detected a climatic niche shift, as taxa showed different distributions across the temperature gradient. There is enough evidence to describe La Palma populations as a new species. Conclusions We characterized the evolutionary history of Thesium sect. Kunkeliella by integrating genetic and ecological assessments. Our results indicate that this clade has undergone a recent radiation process with niche differentiation among species. The results increase our knowledge about insular radiations and will inform the conservation management of the study species.

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Evolution and conservation genetics of an insular hemiparasitic plant lineage at the limit of survival: the case of Thesium sect. Kunkeliella in the Canary Islands

Cited by 6 publications

References 63 publications

A tough nutlet to crack: Resolving the phylogeny of Thesium (Thesiaceae), the largest genus in Santalales

A tough nutlet to crack: Resolving the phylogeny of Thesium (Thesiaceae), the largest genus in Santalales

Genotyping‐by‐sequencing informs conservation of Andean palms sources of non‐timber forest products

Evolution and conservation genetics of an insular hemiparasitic plant lineage at the limit of survival: the case of Thesium sect. Kunkeliella in the Canary Islands

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