Search results for "Defence"
showing 10 items of 472 documents
Clathrin-mediated endocytosis: an early event triggered by an elicitor of defence reaction in tobacco
2007
International audience
Establishment of tools for investigating pyoverdine impact on iron homeostasis and plant defense responses
2013
Iron, the fourth major element in the Earth crust, is essential for growth and development of living organisms. However, due to its low solubility in the soil, it is weakly available for plants and micro-organisms. To efficiently assimilate iron, living organisms have evolved specific strategies. In plants such as Arabidopsis thaliana three trans-membrane proteins are involved in iron assimilation while in bacteria such as Pseudomonas fluorescens iron is taken up from the soil thanks to molecules displaying high affinity for iron called siderophores. It has been recently shown that pyoverdine, the major siderophore of the beneficial bacterium Pseudomonas fluorescens, is assimilated by A. th…
Impact of stresses associated to climate changes on natural and induced grapevine resistance to pathogens
2013
France is a worldwide leader in grape production and has to face global changes including climate evolution and transitions towards sustainable systems of production. One major problem in viticulture is indeed the high susceptibility of most of the grown cultivars to cryptogamic diseases, such as downy mildew (Plasmopara viticola). Maintaining a satisfactory health status of grapevine currently requires numerous fungicide treatments. However, in an objective of sustainable viticulture, there is increasing societal request, winegrower awareness, and political incitation to reduce this use of pesticides. For these reasons, alternative strategies of protection are currently investigated at the…
Impact des maladies du bois sur le fonctionnement de la vigne
2020
Esca complex and Botryosphearia dieback are grapevine trunk diseases (GTDs) that cause severe declines in vineyards worldwide and against which the available control strategies are limited. These diseases are due to a complex of woody inhabiting fungi that colonize the perennial organs of grapevine throughout its life, from its production in nursery to the cultivation in the vineyard. The expression of foliar symptoms remains poorly understood and is influenced by many factors including climate, cultural practices and cultivar. In this context, this work aimed to characterize the impact of these two diseases on grapevine, at different spatial and temporal scales, in order to better understa…
Sesquiterpene volatile organic compounds (VOCs) are markers of elicitation by sulfated laminarine in grapevine
2015
SPE IPM UB CT1; International audience; Inducing resistance in plants by the application of elicitors of defense reactions is an attractive plant protection strategy, particularly for grapevine (Vitis vinifera), which is susceptible to severe fungal diseases. Although induced resistance (IR) can be successful under controlled conditions, in most cases, IR is not sufficiently effective for practical disease control under outdoor conditions. Progress in the application of IR requires a better understanding of grapevine defense mechanisms and the ability to monitor defense markers to identify factors, such as physiological and environmental factors, that can impact IR in the vineyard. Volatile…
Larval zebrafish as an in vitro model for evaluating toxicological effects of mycotoxins.
2020
The presence of mycotoxins in food has created concern. Mycotoxin prevalence in our environment has changed in the last few years maybe due to climatic and other environmental changes. Evidence has emerged from in vitro and in vivo models: some mycotoxins have been found to be potentially carcinogenic, embryogenically harmful, teratogenic, and to generate nephrotoxicity. The risk assessment of exposures to mycotoxins at early life stages became mandatory. In this regard, the effects of toxic compounds on zebrafish have been widely studied, and more recently, mycotoxins have been tested with respect to their effects on developmental and teratogenic effects in this model system, which offers …
Uccisioni mirate, legittima difesa preventiva e diritti umani
2018
Targeted killings by drones on the territory of other States has increasingly become the US Administration’s weapon of choice in the war against terrorism. According to the US, these operations constitute a justified use of self-defensive force «against terrorists who pose a continuing and imminent threat to the American people» (Remarks by the President at the National Defense University, 23 May 2013, www.whitehouse.gov). The aim of the present article is to assess the validity of this justification under both ius ad bellum and international human rights law. To this end, Section 1 introduces the arguments advanced by the US Administration. Section 2 explores the admissibility of anticipat…
Effects of a glyphosate-based herbicide on survival and oxidative status of a non-target herbivore, the Colorado potato beetle (Leptinotarsa decemlin…
2019
Glyphosate is the globally most used herbicide against a wide range of weeds. Glyphosate has been considered safe to animals as it mainly targets physiological pathways in plants. However, recent toxicological studies have revealed that glyphosate can cause various toxic effects also on animals. In this study, we investigated the direct toxic effects of a glyphosate-based herbicide (GBH, Roundup® Bio) on 1) survival and 2) oxidative status of a non-target herbivore by using Colorado potato beetles (Leptinotarsa decemlineata), originating from Poland and USA, as model species. Larvae were randomly divided into three groups: 1) high concentration (100% Roundup Bio, 360 g/l), 2) low concentrat…
Zasięg korporacyjnego upoważnienia aplikanta do zastępstwa
2023
Upoważnienie aplikanta do zastępstwa funkcjonuje od dawna. Jako że ma charakter tylko albo aż upoważnienia korporacyjnego, stąd też na tym tle jest ono różnie postrzegane. Do tego dochodzą dylematy w zakresie pełnienia przez profesjonalnego pełnomocnika funkcji kuratora, a także kwestia udzielenia upoważnienia do zastępstwa dla aplikanta czy nawet substytucji procesowej dla innego profesjonalnego pełnomocnika w osobie adwokata lub radcy prawnego. Wielość wątków z uwagi na szerokie spektrum aktywności aplikanta, co wiązać należy z odbywaną przez niego aplikacją adwokacką albo radcowską, pociąga za sobą konieczność umiejscowienia go w szeroko rozumianym wymiarze sprawiedliwości jako osoby qua…
Melanin-based colour polymorphism signals aggressive personality in nest and territory defence in the tawny owl (Strix aluco)
2013
Nest and territory defence are risky and potentially dangerous behaviours. If the resolution of life history trade-offs differs between individuals, the level of defence may also vary among individuals. Because melanin-based colour traits can be associated with life history strategies, differently coloured individuals may display different nest and territory defence strategies. We investigated this issue in the colour polymorphic tawny owl (Strix aluco) for which plumage varies from dark to light reddish melanic. Accordingly, we found that (1) our presence induced a greater response (flying around) from dark-coloured than light-coloured females and (2) dark reddish males suffered lower nest…