Genetic diversity and genetic structure in wild populations of Mexican oregano (Lippia graveolens H.B.K.) and its relationship with the chemical composition of the essential oil

Martínez-Natarén, Daniela A.; Parra-Tabla, Vı́ctor; Ferrer, Miriam M.; Calvo-Irabién, Luz María

doi:10.1007/s00606-013-0902-y

Cited by 28 publications

(17 citation statements)

References 56 publications

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“…The program Peakmatcher ( DeHaan et al, 2002 ) was used to generate 0/1 matrices of banding patterns. Bands occurring in fewer than 5% (or more than 95%) of accessions within a species were discarded ( Lynch and Milligan, 1994 ;Suárez-Montes et al, 2011 ;Martínez-Natarén et al, 2014 ). AFLP bands were assumed to correspond to loci with two alleles, in which band presence indicated either a dominant homozygote or a heterozygote, while band absence indicated a recessive homozygote.…”

Section: Resultsmentioning

confidence: 99%

Spatial genetic structure in four understoryPsychotriaspecies (Rubiaceae) and implications for tropical forest diversity

Theim

Shirk

Givnish

2014

American J of Botany

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• Premise of the study: Tropical forests are the most species-rich terrestrial communities on Earth, and understory trees and shrubs comprise a large fraction of their plant species diversity, especially at high rainfalls. The mechanisms responsible for generating such high levels of diversity remain unknown. One hypothesis is that fleshy-fruited understory species should have limited seed dispersal due to the sedentary nature of their avian dispersers, resulting in restricted gene flow, population differentiation at small spatial scales, and ultimately, high rates of allopatric speciation.• Methods: We sampled four species of the hyperdiverse tropical shrub genus Psychotria (Rubiaceae) on Barro Colorado Island (BCI) and two nearby sites in Panama. We genotyped each species with AFLPs, assessed genetic differentiation among populations, and determined patterns of fine-scale spatial genetic structure in the BCI population. Measures of spatial autocorrelation and population density were used to estimate the dispersal distance parameter σ.• Key results: Regionally, Φ values ranged from 0.13 to 0.28, reflecting local population differentiation and suggesting that Lake Gatun/Rio Chagres has posed a relatively strong barrier to gene flow. Fine-scale spatial genetic structure on BCI was stronger than in most canopy trees, and estimated distances of gene flow were unusually low for endozoochorous tropical woody plants, with dispersal distance σ = 9-113 m.• Conclusions: These results demonstrate comparatively limited gene flow in bird-dispersed understory species, supporting a hypothesized mechanism for generating high levels of plant species diversity in tropical rain forests, in one of the largest genera of flowering plants on Earth.

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Section: Resultsmentioning

confidence: 99%

Spatial genetic structure in four understoryPsychotriaspecies (Rubiaceae) and implications for tropical forest diversity

Theim

Shirk

Givnish

2014

American J of Botany

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“…The influence of various climatic and edaphic conditions on the essential oil composition of several species was largely discussed. These factors were shown to have significant impact on the biosynthesis pathways responsible for the production of compounds related to the adaptative strategy of plants against environmental constraints …”

Section: Resultsmentioning

confidence: 99%

Essential Oil Variability in Natural Populations of Artemisia campestris (L.) and Artemisia herba‐alba (Asso) and Incidence on Antiacetylcholinesterase and Antioxidant Activities

Younsi

Mehdi

Aissi

et al. 2017

Chemistry & Biodiversity

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The intraspecific variability of Artemisia herba-alba and A. campestris essential oils and the evaluation of their antioxidant and antiacetylcholinesterase activities were determined. Artemisia herba-alba essential oil was found rich in camphor (19.61%), α-thujone (19.40%), β-thujone (9.44%), chrysanthenone (9.26%), and trans-sabinyl acetate (8.43%). The major compounds of A. campestris essential oil were germacrene D (16.38%), β-pinene (16.33%), and limonene (9.17%). Significant variation in the essential oil composition was observed among populations of each species. The divergence between populations was attributed to the variation of some climatic factors such as altitude, annual rainfall, winter cold stress, summer precipitation, summer drought stress, evapotranspiration, and humidity. Artemisia herba-alba and A. campestris essential oils exhibited promising antioxidant and antiacetylcholinesterase activities. The level of activity varied significantly according to the species and the essential oil. The highest scavenging activity (IC = 0.14 mg/ml) and the uppermost capacity to prevent β-carotene bleaching (IC = 0.10 mg/ml) characterized A. campestris from population 6. A. campestris population 3 possessed the uppermost ability to reduce ferric ions (450.7 μmol Fe /g EO). The population 2 of A. campestris showed the strongest antiacetylcholinesterase activity (IC = 0.02 mg/ml). The variation of these activities between the essential oils was explained by their composition differences.

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“…Plots were constructed using the standardized covariance of genetic distances among individuals with 999 permutations (Martínez-Natarén et al . 2014) in GenAlEx (Peakall & Smouse 2012). Isolation by distance was tested by assessing the significance of the correlation between Nei's genetic distance and geographic distance among populations, performing 999 permutations using GenAlEx (Peakall & Smouse 2012) to conduct a Mantel test.…”

Section: Methodsmentioning

confidence: 99%

Genetic diversity and structure of the treeManilkara zapotain a naturally fragmented tropical forest

2017

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Abstract:Forest fragmentation, habitat loss and isolation may have a strong effect on biodiversity in tropical forests. This can include modification of the genetic diversity and structure of plant populations. In this study, we assessed the genetic diversity and structure of the treeManilkara zapotain 15 naturally formed fragments of semi-evergreen tropical forest, as well as in an adjacent continuous forest for comparison. Forest fragments were scattered within a matrix of wetlands and were highly variable in terms of size and degree of isolation. The naturally fragmented populations ofM.zapotahad slightly less allelic diversity (Ar: 3.4) than those of the continuous forest (Ar: 3.6), when corrected for sample size. However, populations in the fragments and continuous forest had very similar heterozygosity levels (HE: 0.59 in both cases). Low levels of genetic differentiation were observed among populations (FST: 0.026) and genetic structure was not consistent with isolation by distance, indicating high levels of gene flow. Genetic diversity was not explained by fragment size or degree of isolation. The relatively high genetic diversity and low inter-population genetic differentiation observed inM. zapotamay be the result of long-distance pollen and seed dispersal, as well as the high proximity among patches.

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Genetic diversity and genetic structure in wild populations of Mexican oregano (Lippia graveolens H.B.K.) and its relationship with the chemical composition of the essential oil

Cited by 28 publications

References 56 publications

Spatial genetic structure in four understoryPsychotriaspecies (Rubiaceae) and implications for tropical forest diversity

Spatial genetic structure in four understoryPsychotriaspecies (Rubiaceae) and implications for tropical forest diversity

Essential Oil Variability in Natural Populations of Artemisia campestris (L.) and Artemisia herba‐alba (Asso) and Incidence on Antiacetylcholinesterase and Antioxidant Activities

Genetic diversity and structure of the treeManilkara zapotain a naturally fragmented tropical forest

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