Integrative taxonomy improves delimitation in Hypericum subspecies

Ely, Cleusa Vogel; Andrade, Bianca Ott; Iganci, João Ricardo Vieira; Boldrini, Ilsi Iob

doi:10.1016/j.ppees.2018.08.005

Cited by 9 publications

(6 citation statements)

References 34 publications

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“…We also constructed a bioclimatic dataset using data extracted from the WorldClim database (Fick and Hijmans 2017) based on specimen coordinates using 2.5 arc minute grid resolution. We only selected variables that represent climatic extremes, which are more influential on plant distribution (Vogel Ely et al 2018): BIO3 (isothermality), BIO4 (temperature seasonality), BIO5 (maximum temperature of warmest month), BIO6 (minimum temperature of coldest month), BIO13 (precipitation of wettest month), BIO14 (precipitation of driest month), BIO15 (precipitation seasonality, coefficient of variation), BIO17 (precipitation of driest quarter), BIO18 (precipitation of warmest quarter). Tests revealed high collinearity ( r ≥ 0.8 or r ≤ -0.8) among some of the variables, resulting in the exclusion of BIO3, BIO14, and BIO17 from further analyses.…”

Section: Methodsmentioning

confidence: 99%

“…macrocalyx could reach up to 170 mm, but we found few leaves of both varieties greater than 100 mm. Morphometrics is usually considered as a method to find key taxonomic characters, but it can also be a strong approach to confirm the weakness of continuous characters for taxonomic delimitation (Vogel Ely et al 2018). However, one interesting feature worth mentioning is the leaf margin.…”

Section: Systematic Botany 428mentioning

confidence: 99%

“…Notably, many plant genera had their last taxonomic revision a few decades ago and are in urgent need of new taxonomic assessments, as a considerable number of plant species in Brazil are described when old herbarium records are revisited (Sobral and Stehmann 2009). Herborized material is commonly used in studies involving species complexes that intrigue botanists working in Brazil (Ceolin and Miotto 2012; André et al 2015; Vogel Ely et al 2018). These groups usually refer to lineages at the beginning of the speciation continuum or cryptic lineages, making it difficult to distinguish populations from emerging species and establish taxonomic boundaries (Bickford et al 2007; Pinheiro et al 2018).…”

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confidence: 99%

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Revisiting Metternichia (Solanaceae) Through an Integrative Approach: A Monotypic Genus?

de Souza,

Andrade,

Radaeski

et al. 2023

Systematic Botany

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Abstract— Improving species delimitation and knowledge on species complexes is crucial for many areas of study in Biology, especially conservation. Integrative taxonomy contributes to this topic by using different approaches to better delineate taxonomic boundaries. Metternichia (Solanaceae), historically a monospecific genus, has a geographic range that comprises contrasting environments. Metternichia principis was described as having two varieties: the typical variety, found in the humid forests of eastern Brazil (Atlantic Forest region), and M. principis var. macrocalyx, which presents a larger calyx and inhabits mostly semi-arid areas (Caatinga region). In this study, we tested the validity of such groups by integrating environmental, phenological, morphometric, and palynological data; applying uni- and multivariate tests; and evaluating the conservation status of each taxon. Our results support the recognition of two morphological groups within Metternichia, largely in agreement with the original circumscription of the varieties. Multivariate analyses clearly indicate different ecological niches, with each taxon inhabiting environments with distinct mean annual precipitation and temperature. Phenological data show some differences between the varieties regarding months with the highest number of flowering and fruiting records. In general, M. principis var. macrocalyx presents larger flower and pollen characters, and smaller fruit characters compared to the typical variety. Based on these findings, we elevate the variety to the status of species, as the new combination Metternichia macrocalyx. Following IUCN guidelines, both taxa are here preliminarily considered endangered (EN).

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Section: Methodsmentioning

confidence: 99%

Section: Systematic Botany 428mentioning

confidence: 99%

mentioning

confidence: 99%

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Revisiting Metternichia (Solanaceae) Through an Integrative Approach: A Monotypic Genus?

de Souza,

Andrade,

Radaeski

et al. 2023

Systematic Botany

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“…This analysis is useful for studying geographic distribution and habitat preferences, aimed at species conservation and taxa delimitation (Sites & Marshall, 2003;Wiens, 2007;Schlick-Steiner et al, 2010). The combination of morphological analyses with ecological approaches may explain the influence of abiotic factors on the geographical distribution as well as their effect on specific changes in phenotypic variation patterns (Vogel Ely et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Distribution models and morphometric analyses in Deyeuxia velutina, an Andean grass species

Ferrero

Sassone

Giussani

et al. 2020

Darwiniana, nueva serie

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Rúgolo de Agrasar recognized two varieties of Deyeuxia velutina (D. velutina var. velutina and D. velutina var. nardifolia) based on leaf sheath indumentum, lemma length, and leaf blade direction. However, taxonomic delimitation has been difficult due to occasional overlapping characters. To assess the infraspecific delimitation of D. velutina, we present a comprehensive study combining morphometric analyses and a potential distribution model. To explore morphological variation and select diagnostic characters, we measured 124 morphological characters in 52 specimens of both varieties and performed a principal coordinate analysis and univariate analyses (Analysis of variance and Kruskal-Wallis non-parametric test). Both taxa resolved as separate morphological groups. Additionally, a Discriminant Analysis was performed to classify the individuals in the predetermined morphological groups. For modeling the species distribution, 26 specimens of D. velutina var. nardifolia and 68 of D. velutina var. velutina were georeferenced and 20 environmental variables were analyzed through a Maximum Entropy model. Deyeuxia velutina extends in the high Andean region from Peru to southern Argentina and Chile. Both varieties differed in their geographical limits, a result supported by regression analyses of latitude and longitude on the principal coordinates of the PCoA. Deyeuxia velutina var. nardifolia is restricted to the northern area of distribution while D. velutina var. velutina showed a higher habitat suitability in the southern region. Moreover, D. velutina var. nardifolia is here reported for the first time in San Juan province (Argentina), constituting the austral limit of its geographical distribution. Additional reliable morphological characters were considered in an updated key to the varieties.

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“…The genus Hypericum is the largest in the family Hypericaceae and includes more than 500 species worldwide, and it is a rich resource for medicinal plants. , These species have attracted substantial scientific interest in the fields of taxonomy, chemistry, and pharmacology. Numerous recent pharmacological studies have identified several Hypericum species possessing important therapeutic properties, such as antidepressant, , neuroprotective, − anti-neuroinflammatory, neurotrophic, acetylcholinesterase inhibitory, and cognition- and memory-enhancing effects .…”

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confidence: 99%

Hyperhubeins A–I, Bioactive Sesquiterpenes with Diverse Skeletons from Hypericum hubeiense

et al. 2022

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Nine new sesquiterpenes, hyperhubeins A–I (1–9), and 14 known analogues (10–23) were isolated from the aerial portions of Hypericum hubeiense. Their structures and absolute configurations were determined unambiguously via spectroscopic analysis, single-crystal X-ray diffraction, and electronic circular dichroism calculations. Compounds 1–3 possess an unprecedented sesquiterpene carbon skeleton. Further, a plausible biosynthetic pathway from farnesyl diphosphate (FPP) is proposed. The isolated phytochemicals were evaluated for neuroprotective and anti-neuroinflammatory properties in vitro. Compounds 1, 2, 5–8, 14, and 21 displayed notable neuroprotective activity against hydrogen peroxide (H2O2)-induced lesions in PC-12 cells at 10 μM. Additionally, compounds 1, 2, 12, and 13 exhibited inhibition of lipopolysaccharide (LPS)-induced nitric oxide (NO) production in BV-2 microglial cells, with their IC50 values ranging from 4.92 to 6.81 μM. Possible interactions between these bioactive compounds and inducible nitric oxide synthase (iNOS) were predicted via molecular docking. Moreover, Western blotting indicated that compound 12 exerted anti-neuroinflammatory activity by suppressing LPS-stimulated expression of toll-like receptor-4 (TLR-4) and inhibiting consequent activation of nuclear factor-kappa-B (NF-κB) signaling.

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Integrative taxonomy improves delimitation in Hypericum subspecies

Cited by 9 publications

References 34 publications

Revisiting Metternichia (Solanaceae) Through an Integrative Approach: A Monotypic Genus?

Revisiting Metternichia (Solanaceae) Through an Integrative Approach: A Monotypic Genus?

Distribution models and morphometric analyses in Deyeuxia velutina, an Andean grass species

Hyperhubeins A–I, Bioactive Sesquiterpenes with Diverse Skeletons from Hypericum hubeiense

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