Conservation implications of genetic structure in the narrowest endemic quillwort from the Eastern Amazon

Dalapicolla, Jeronymo; Alves, Ronnie; Jaffé, Rodolfo; Vasconcelos, Santelmo; Pires, Eder S.; Nunes, Gisele; Pereira, José A.; Guimarães, José Tasso Felix; Dias, Mariana Costa; Fernandes, Taís Nogueira; Scherer, Daniela S.; Santos, Fernando Marino Gomes dos; Castilho, Alexandre; Santos, Mirella Pupo; Calderón, Emiliano Nicolas; Martins, Rodrigo Lemes; Fonseca, Rodrigo Nunes da; Esteves, Francisco de Assis; Caldeira, Cecílio Fróis; Oliveira, Guilherme

doi:10.1002/ece3.7812

Cited by 11 publications

(8 citation statements)

References 116 publications

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“…As research efforts are starting to address the genetic diversity of plant species with restricted geographic distribution in the highly explored ironstone outcrops of the Serra dos Carajás [e.g. 5 , 6 , 9 , 86 , 87 ], the main focus has been directed to understand population dynamics of a few lineages employing NGS-derived SNP analyses. However, there is still the need for a better coverage of genetic studies on the several known endemics of the cangas [ 2 ].…”

Section: Discussionmentioning

confidence: 99%

New plastomes of eight Ipomoea species and four putative hybrids from Eastern Amazon

et al. 2022

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Ipomoea is a large pantropical genus globally distributed, which importance goes beyond the economic value as food resources or ornamental crops. This highly diverse genus has been the focus of a great number of studies, enriching the plant genomics knowledge, and challenging the plant evolution models. In the Carajás mountain range, located in Eastern Amazon, the savannah-like ferruginous ecosystem known as canga harbors highly specialized plant and animal populations, and Ipomoea is substantially representative in such restrictive habitat. Thus, to provide genetic data and insights into whole plastome phylogenetic relationships among key Ipomoea species from Eastern Amazon with little to none previously available data, we present the complete plastome sequences of twelve lineages of the genus, including the canga microendemic I. cavalcantei, the closely related I. marabaensis, and their putative hybrids. The twelve plastomes presented similar gene content as most publicly available Ipomoea plastomes, although the putative hybrids were correctly placed as closely related to the two parental species. The cavalcantei-marabaensis group was consistently grouped between phylogenetic methods. The closer relationship of the I. carnea plastome with the cavalcantei-marabaensis group, as well as the branch formed by I. quamoclit, I. asarifolia and I. maurandioides, were probably a consequence of insufficient taxonomic representativity, instead of true genetic closeness, reinforcing the importance of new plastome assemblies to resolve inconsistencies and boost statistical confidence, especially the case for South American clades of Ipomoea. The search for k-mers presenting high dispersion among the frequency distributions pointed to highly variable coding and intergenic regions, which may potentially contribute to the genetic diversity observed at species level. Our results contribute to the resolution of uncertain clades within Ipomoea and future phylogenomic studies, bringing unprecedented results to Ipomoea species with restricted distribution, such as I. cavalcantei.

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Section: Discussionmentioning

confidence: 99%

New plastomes of eight Ipomoea species and four putative hybrids from Eastern Amazon

et al. 2022

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“…In addition, it is essential to pay extra attention to endemic and/or rare species of such a unique Amazon vegetation as the campo rupestre on canga of the Serra dos Carajás, as in the case of the morning‐glory Ipomoea cavalcantei and the quillwort Isoetes cangae , for instance. Both species present a very limited geographic distribution in the canga (Giulietti et al., 2019 ), with studies based on DNA barcoding data investigating their genetic diversity status for the first time (Babiychuk et al., 2017 ; Nunes et al., 2018 ), followed by further populational analyses (Babiychuk et al., 2019 ; Dalapicolla et al., 2021 ; Lanes et al., 2018 ).…”

Section: Discussionmentioning

confidence: 99%

Unraveling the plant diversity of the Amazonian canga through DNA barcoding

Vasconcelos

Nunes

Dias

et al. 2021

Ecology and Evolution

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“…The sexual propagation of I. cangae is an important way to expand its genetic diversity and reduce the risks associated with inbreeding. In recent studies carried out with ISSR markers [16] and a large number of SNPs [26], it was revealed that I. cangae consists of a single panmictic population with a moderate levels of genetic diversity and no inbreeding signal. Such diversity is likely to result from the male gamete [27] and young sporophytes movements in the Amendoim lake [28], increasing the possibility of cross-fertilization.…”

Section: Discussionmentioning

confidence: 99%

Distinct Reproductive Strategy of Two Endemic Amazonian Quillworts

Caldeira

Lopes²,

Aguiar

et al. 2021

Diversity

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We examined the reproductive strategy of two Amazonian quillworts (Isoëtes cangae and Isoëtes serracarajensis), endemic and threatened species of canga ecosystems. Sexual propagation was examined by in vitro fertilization assays, while asexual propagation was examined by tiller emission. Isoëtes cangae is an outcrossing species that reproduces exclusively by spore germination and is able to propagate by self- and cross-fertilization. Isoëtes serracarajensis reproduces asexually by emitting tillers from the plant corm, despite producing male and female sporangia. These distinct reproductive strategies in the different species may be linked to their contrasting habitats. Isoëtes cangae inhabit a permanent oligotrophic lake with mild environmental changes, while I. serracarajensis are found in temporary ponds facing severe seasonal drought, where asexual propagation may represent an adaptive advantage to the short growth period during access to water. We also observed different relationships between plant growth and reproductive traits between the species, despite their common production of sporophytes with high survival rates. Together, these results are of paramount importance for establishing conservation plans for both species considering the advantages of sexual propagation to maintain the genetic diversity of I. cangae and the diligent management required to do the same with asexually propagated I. serracarajensis.

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Conservation implications of genetic structure in the narrowest endemic quillwort from the Eastern Amazon

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 11 publications

References 116 publications

New plastomes of eight Ipomoea species and four putative hybrids from Eastern Amazon

New plastomes of eight Ipomoea species and four putative hybrids from Eastern Amazon

Unraveling the plant diversity of the Amazonian canga through DNA barcoding

Distinct Reproductive Strategy of Two Endemic Amazonian Quillworts

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