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12 rezultatov
Manipulation of VOC emissions with methyl jasmonate and carrageenan in the evergreen conifer Pinus sylvestris and evergreen broadleaf Quercus ilex.
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Prijava / prijava
Plant defence can be induced by exposing plants to the plant hormone jasmonic acid (JA) or its volatile ester, methyl jasmonate (MeJA). Carrageenans (Carr) - sulphated D-galactans extracted from red algae - can also induce plant defences. In this study, the effects of exogenous MeJA and Carr
Contrasting physiological responses to Mediterranean climate variability are revealed by intra-annual density fluctuations in tree rings of Quercus ilex L. and Pinus pinea L.
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Prijava / prijava
Mixed forests of Quercus ilex L. and Pinus pinea L. are widely found throughout the Mediterranean Basin, being representative of two co-existing functional types: evergreen-sclerophyllous drought-resistant species and Mediterranean-adapted drought-avoidant conifers. Their contrasting physiological
Comparison of the formation of nicotinic acid conjugates in leaves of different plant species.
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Prijava / prijava
There are three metabolic fates of nicotinic acid in plants: (1) nicotinic acid mononucleotide formation for NAD synthesis by the so-called salvage pathway of pyridine nucleotide biosynthesis; (2) nicotinic acid N-glucoside formation; and (3) trigonelline (N-methylnicotinic acid) formation. In the
More than just drought: complexity of recruitment patterns in Mediterranean forests.
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Prijava / prijava
Understanding community dynamics during early life stages of trees is critical for the prediction of future species composition. In Mediterranean forests drought is a major constraint for regeneration, but likely not the only factor determining the observed spatial patterns. We carried out a sowing
Rhizosphere dynamics during phytoremediation of olive mill wastewater.
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Prijava / prijava
The potential of phytoremediation as a treatment option for olive mill wastewater (OMW) was tested on five perennial tree species. Cupressus sempervirens and Quercus ilex proved tolerant to six-month OMW treatment followed by six-month water irrigation, whereas Salix sp. and Laurus nobilis and,
Mutagenicity assessment of aerosols in emissions from wood combustion in Portugal.
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Prijava / prijava
Polycyclic aromatic hydrocarbon (PAH) extracts of fine particles (PM(2.5)) collected from combustion of seven wood species and briquettes were tested for mutagenic activities using Ames test with Salmonella typhimurium TA98 and TA100. The woods were Pinus pinaster (maritime pine), Eucalyptus
Assessing the risk caused by ground level ozone to European forest trees: a case study in pine, beech and oak across different climate regions.
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Prijava / prijava
Two different indices have been proposed for estimation of the risk caused to forest trees across Europe by ground-level ozone, (i) the concentration based AOT40 index (Accumulated Over a Threshold of 40 ppb) and (ii) the recently developed flux based AFstY index (Accumulated stomatal Flux above a
Suitability of multiple Mediterranean oak species as a food resource for Reticulitermes grassei Clément (Isoptera: Rhinotermitidae).
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Prijava / prijava
The subterranean termite Reticulitermes grassei Clément causes lesions in the trunk of Quercus suber L. by constructing feeding galleries, but no information is available regarding other Quercus species from the Mediterranean region. This work aimed to study the suitability of the other main oak
Losses of leaf area owing to herbivory and early senescence in three tree species along a winter temperature gradient.
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Prijava / prijava
In temperate climates, evergreen leaves have to survive throughout low temperature winter periods. Freezing and chilling injuries can lead to accelerated senescence of part of the leaf surface, which contributes to a reduction of the lifespan of the photosynthetic machinery and of leaf lifetime
Higher plants as bioindicators of sulphur dioxide emissions in urban environments.
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Prijava / prijava
The evaluation of certain vascular plants that grow in the city of Madrid as biomonitors of SO(2) air pollution in urban environments has been carried out. Total concentration of sulphur in leaves of the chosen higher plants as well as other parameters in close relation to this contaminant (visible
Emission factors from residential combustion appliances burning Portuguese biomass fuels.
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Prijava / prijava
Smoke from residential wood burning has been identified as a major contributor to air pollution, motivating detailed emission measurements under controlled conditions. A series of experiments were performed to compare the emission levels from two types of wood-stoves to those of fireplaces. Eight
Post-drought Resilience After Forest Die-Off: Shifts in Regeneration, Composition, Growth and Productivity.
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Prijava / prijava
A better understanding on the consequences of drought on forests can be reached by paying special attention to their resilience capacity, i.e., the ability to return to a state similar to pre-drought conditions. Nevertheless, extreme droughts may surpass the threshold for the resilience capacity
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