Can isoprenoids in leaves and roots of plants serve as biomarkers for past vegetation changes? A case study from the Ecuadorian Andes

Jansen, Boris; Nierop, Klaas G.J.; Tonneijck, Femke H.; Wielen, F.W.M. van der; Verstraten, J.M.

doi:10.1007/s11104-006-9185-1

Cited by 18 publications

(3 citation statements)

References 20 publications

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“…Paulsen et al 2000;Körner and Paulsen 2004). 2002) as well as biogenic chemicals or small charcoal particles (Jansen et al 2007;di Pasquale et al 2008) have been employed but the data tell little about regeneration. Analysis of stand structure also gives historical information, but allows much more direct inferences on regeneration patterns (e.g.…”

Section: General Methodological Considerationsmentioning

confidence: 99%

Recruitment of trees at tropical alpine treelines:Ericain Africa versusPolylepisin South America

Wesche

Cierjacks

Assefa

et al. 2008

Plant Ecology & Diversity

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Background: Constraints on tree regeneration have been described from several temperate treeline sites, however data from tropical mountains are few. Aim: We test the hypothesis that high altitude treelines are caused by constraints on tree regeneration. We report the results of recent studies on climatic variables and on the reproduction of Erica spp. in east Africa, and compare those with similar studies on treeline stands of Polylepis spp. in Ecuador and Bolivia. Methods: We established altitudinal and horizontal transects comprising sampling plots from forests to surrounding grasslands. Data on microclimate, vegetation structure and reproductive activity were collected in the field, and supplemented by tests on germination requirements in the field in permanent exclosures and in the laboratory. Results: Our measurements demonstrated that the number and severity of frost events and potential water stress were higher near the soil surface (0.5 m) than in free air (2.0 m). Seeds of Erica trimera did not germinate, as the necessary climatic requirements (high diurnal temperature range, but no frost) were rarely fulfilled in the field. Most studied species were capable of clonal growth, and the relative importance of vegetative persistence tended to increase with altitude. These effects were independent of the intensity of land use. Conclusions:The harsh microclimate near the soil surface at tropical treelines may be one reason why recruitment from seed is limited for treeline-forming species. This is important for restoration or conservation schemes as well as predictions of treeline dynamics under global change.

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Section: General Methodological Considerationsmentioning

confidence: 99%

Recruitment of trees at tropical alpine treelines:Ericain Africa versusPolylepisin South America

Wesche

Cierjacks

Assefa

et al. 2008

Plant Ecology & Diversity

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“…For what concerns the species G. buxifolia , only two studies have been published so far: one focusing on ecology, and the other covering the phytochemistry of the non-volatile fraction [ 14 , 15 ]. To the best of the authors’ knowledge, no information has been reported about the EO.…”

Section: Introductionmentioning

confidence: 99%

The Leaf Essential Oil of Gynoxys buxifolia (Kunth) Cass. (Asteraceae): A Good Source of Furanoeremophilane and Bakkenolide A

Cumbicus

Malagón

Cumbicus

et al. 2023

Plants

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The present study describes the chemical and enantiomeric composition of a new essential oil, distilled from the dry leaves of Gynoxys buxifolia (Kunth) Cass. The chemical analysis was conducted by GC-MS and GC-FID, on two orthogonal capillary columns. A total of 72 compounds were detected and quantified with at least one column, corresponding to about 85% by weight of the whole oil mass. Of the 72 components, 70 were identified by comparing the respective linear retention indices and mass spectra with data from the literature, whereas the two main constituents were identified by preparative purification and NMR experiments. The quantitative analysis was carried out calculating the relative response factor of each compound according to their combustion enthalpy. The major constituents of the EO (≥3%) were: furanoeremophilane (31.3–28.3%), bakkenolide A (17.6–16.3%), caryophyllene oxide (6.0–5.8%), and (E)-β-caryophyllene (4.4%). Additionally, the hydrolate was also analyzed with respect to the dissolved organic phase. About 40.7–43.4 mg/100 mL of organic compounds was detected in solution, of which p-vinylguaiacol was the main component (25.4–29.9 mg/100 mL). Finally, the enantioselective analysis of some chiral terpenes was carried out, with a capillary column based on β-cyclodextrin chiral stationary phase. In this analysis, (1S,5S)-(−)-α-pinene, (1S,5S)-(−)-β-pinene, (S)-(+)-α-phellandrene, (S)-(+)-β-phellandrene, and (S)-(−)-terpinen-4-ol were detected as enantiomerically pure, whereas (S)-(−)-sabinene showed an enantiomeric excess of 69.2%. The essential oil described in the present study is a good source of two uncommon volatile compounds: furanoeremophilane and bakkenolide A. The former lacks bioactivity information and deserves further investigation, whereas the latter is a promising selective anticancer product.

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“…3). These pentacyclic triterpenes has been previously found in Ericaceae plant material and in soils under this plant family (Van Smeerdijk and Boon 1987;Nierop et al 2001;Naafs et al 2004;Jansen et al 2007). In addition, taraxenone and taraxerol are known bioactive plant constituents having insecticidal (Williams 1999), antimicrobial (Aguilar-Guadarrama et al 2009), phytotoxic and root growth inhibitory (Macías-Rubalcava et al 2007) activities.…”

Section: Study Of Soil Lipids By Gc-msmentioning

confidence: 63%

Geochemical and ecological significance of soil lipids under Rhododendron ponticum stands

et al. 2010

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The bio-geographical significance of Rhododendron ponticum spp. baeticum (Ericaceae) as a relict species is well recognized. However, out of its native habitat it is an invasive exotic considered a major threat to natural ecosystems in areas of Atlantic Western Europe. The studies on the impact of Rhododendron influence on soil organic matter composition and associated ecological implications, i.e. presence of bioactive compounds with ecological significance, are limited. This work describes the soil lipid assemblage in three sites under Rhododendron stands and adjacent sites with deciduous oak (Quercus canariensis), both in their native habitats in Southern Spain (Sierra de Luna, Cádiz). The results are discussed in terms of organic matter dynamics and the presence of molecules that may be associated with Rhododendron invasive success. The soils are acid Xerochrepts formed on siliceous sands. Composite soil samples were taken at two depths (0-10 cm and 10-20 cm) and soxhlet extracted with a dichloromethanemethanol mixture (3:1). Soil lipid assemblage was studied by GC/MS after fractionation and appropriate derivatization of extracts. The qualitative chemical composition of soil extractable lipids under Rhododendron is reported here for the first time. Our results show that soil n-alkane and fatty acid distributions are compatible with an input from plant epicuticular waxes, as well as with the occurrence of selective preservation of long-chain fatty acids with depth. The pattern of short-chain n-alkanes found in surface samples indicates an anthropogenic contamination threat from nearby industrialized areas of ''Campo de Gibraltar''. The presence of branched iso and anteiso C 15 and C 17 , b-hydroxy fatty acids and the sterol brassicasterol points to high microbial soil activity. Finally, the pentacyclic triterpenes taraxerone and taraxerol were detected in soils with Rhododendron but not with Quercus. These are known bioactive plant compounds and could be related with the effectiveness of Rhododendron as an invasive exotic species.

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Can isoprenoids in leaves and roots of plants serve as biomarkers for past vegetation changes? A case study from the Ecuadorian Andes

Cited by 18 publications

References 20 publications

Recruitment of trees at tropical alpine treelines:Ericain Africa versusPolylepisin South America

Recruitment of trees at tropical alpine treelines:Ericain Africa versusPolylepisin South America

The Leaf Essential Oil of Gynoxys buxifolia (Kunth) Cass. (Asteraceae): A Good Source of Furanoeremophilane and Bakkenolide A

Geochemical and ecological significance of soil lipids under Rhododendron ponticum stands

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