排序方式: 共有10条查询结果,搜索用时 15 毫秒
1
1.
Propiconazole inhibits the sterol 14α-demethylase in Glomus irregulare like in phytopathogenic fungi
Calonne M Sahraoui AL Campagnac E Debiane D Laruelle F Grandmougin-Ferjani A Fontaine J 《Chemosphere》2012,87(4):376-383
The increasing concentrations impact (0.02, 0.2 and 2 mg L−1) of a Sterol Biosynthesis Inhibitor (SBI) fungicide, propiconazole, was evaluated on development and sterol metabolism of two non-target organisms: mycorrhizal or non-mycorrhizal transformed chicory roots and the arbuscular mycorrhizal fungus (AMF) Glomus irregulare using monoxenic cultures. In this work, we provide the first evidence of a direct impact of propiconazole on the AMF by disturbing its sterol metabolism. A significant decrease in end-products sterols contents (24-methylcholesterol and in 24-ethylcholesterol) was observed concomitantly to a 24-methylenedihydrolanosterol accumulation indicating the inhibition of a key enzyme in sterol biosynthesis pathway, the sterol 14α-demethylase like in phytopathogenic fungi. A decrease in end-product sterol contents in propiconazole-treated roots was also observed suggesting a slowing down of the sterol metabolism in plant. Taken together, our findings suggest that the inhibition of the both AM symbiotic partners development by propiconazole results from their sterol metabolism alterations. 相似文献
2.
Haddar Anissa Bouallegue Amir Methneni Rim Ellouz-Chaabouni Semia 《Journal of Polymers and the Environment》2022,30(2):741-751
Journal of Polymers and the Environment - Media composition and culture conditions for levan production by Bacillus mojavensis (BM-levan) were optimized using Plackett–Burman and Box-Behnken... 相似文献
3.
We show in this study that intersexuality can occur in the estuarine copepod Eurytemora affinis, and we reported the presence of three intersexual copepod individuals from a laboratory culture of this species from the
Seine estuary conducted at low temperature (7°C). These individuals presented both female and male characteristics. The prosome
size and antennules of intersex individuals were similar to those of normal females, but all the other morphological details
were more similar to normal males. The appearance of the three intersex individuals in the culture at low temperature coincided
with a decrease in food quality due to a feeding with Rhodomonas marina at its stationary phase. This induced a significant decrease in the mean clutch size and skewed sex-ratio in favor of males.
The reduction in food quality in addition to low temperature of 7°C (which induced slow development) is suspected to be responsible
of the appearance of intersex individuals. This stressful situation seems to propagate to the following two generations at
low temperature in contrast to the case of the experiment at higher temperature 20°C where no intersex individual was observed.
These results confirmed the role of food quality in sex determination of copepods. Moreover, the role of early developmental
stages and also the consequences of stressful conditions throughout different generations were discussed. 相似文献
4.
5.
Polycyclic aromatic hydrocarbons storage by Fusarium solani in intracellular lipid vesicles 总被引:1,自引:0,他引:1
Verdin A Lounès-Hadj Sahraoui A Newsam R Robinson G Durand R 《Environmental pollution (Barking, Essex : 1987)》2005,133(2):283-291
Accumulation and elimination of polycyclic aromatic hydrocarbons (PAHs) were studied in the fungus Fusarium solani. When the fungus was grown on a synthetic medium containing benzo[a]pyrene, hyphae of F. solani contained numerous lipid vesicles which could be stained by the lipid-specific dyes: Sudan III and Rhodamine B. The fluorescence produced by Rhodamine B and PAH benzo[a]pyrene were at the same locations in the fungal hyphae, indicating that F. solani stored PAH in pre-existing lipid vesicles. A passive temperature-independent process is involved in the benzo[a]pyrene uptake and storage. Sodium azide, a cytochrome c oxidation inhibitor, and the two cytoskeleton inhibitors colchicine and cytochalasin did not prevent the transport and accumulation of PAH in lipid vesicles of F. solani hyphae. F. solani degraded a large range of PAHs at different rates. PAH intracellular storage in lipid vesicles was not necessarily accompanied by degradation and was common to numerous other fungi. 相似文献
6.
Manel Haddar Ahmed Elloumi Ahmed Koubaa Chedly Bradai Sebastien Migneault Foued Elhalouani 《Journal of Polymers and the Environment》2017,25(3):617-627
Deinking paper sludge (DPS)/high density polyethylene (HDPE) composites with and without coupling agent (3 % of maleated polyethylene (MAPE)) were manufactured by twin-screw extrusion followed by injection molding with high percentages of DPS (0, 20, 30 and 40 %). The effects of DPS content and MAPE on the mechanical, thermal, and morphological properties of the DPS/HDPE composites were investigated. Increasing DPS content in composites increased the tensile and flexural modulus (E; MOE), tensile and flexural strength (Rm; MOR), while decreased elongation at break and Un-notched impact resistance due to a poor adhesion between the DPS and HDPE. The addition of DPS also improved the thermal stability and increased the composites crystallinity. High content of DPS (40 %) and 3 % MAPE achieved good interfacial adhesion between fibres of DPS and HDPE. Therefore, an increase is observed for Rm, MOR, ductility, and impact toughness. 相似文献
7.
Jan Heuschele Sara Ceballos Christian Marc Andersen Borg Oda Bjærke Stamatina Isari Rachel Lasley-Rasher Elin Lindehoff Anissa Souissi Sami Souissi Josefin Titelman 《Marine Biology》2014,161(7):1653-1666
Reproduction in planktonic animals depends on numerous biotic and abiotic factors. One of them is predation pressure, which can have both direct consumptive effects on population density and sex ratio, and non-consumptive effects, for example on mating and migration behaviour. In copepods, predator vulnerability depends on their sex, motility pattern and mating behaviour. Therefore, copepods can be affected at multiple stages during the mating process. We investigated the reproductive dynamics of the estuarine copepod Eurytemora affinis in the presence and absence of its predator the mysid Neomysis integer in a mesocosm experiment. We found that the proportion of ovigerous females decreased in the presence of predators. This shift was not caused by differential predation as the absolute number of females was unaffected by mysid presence. Presence of predators reduced the ratio of males to non-ovigerous females, but not by predation of males. Our combined results suggest that the shift from ovigerous to non-ovigerous females under the presence of predators was caused by either actively delayed egg production or by shedding of egg sacs. Nauplii production was initially suppressed in the predation treatment, but increased towards the end of the experiment. The proportion of fertilized females was similar in both treatments, but constantly fell behind model predictions using a random mating model. Our results highlight the importance of non-consumptive effects of predators on copepod reproduction and hence on population dynamics. 相似文献
8.
Lopareva-Pohu A Verdin A Garçon G Lounès-Hadj Sahraoui A Pourrut B Debiane D Waterlot C Laruelle F Bidar G Douay F Shirali P 《Environmental pollution (Barking, Essex : 1987)》2011,159(6):1721-1729
Due to anthropogenic activities, large extends of soils are highly contaminated by Metal Trace Element (MTE). Aided phytostabilisation aims to establish a vegetation cover in order to promote in situ immobilisation of trace elements by combining the use of metal-tolerant plants and inexpensive mineral or organic soil amendments. Eight years after Coal Fly Ash (CFA) soil amendment, MTE bioavailability and uptake by two plants, Lolium perenne and Trifolium repens, were evaluated, as some biological markers reflecting physiological stress. Results showed that the two plant species under study were suitable to reduce the mobility and the availability of these elements. Moreover, the plant growth was better on CFA amended MTE-contaminated soils, and the plant sensitivity to MTE-induced physiological stress, as studied through photosynthetic pigment contents and oxidative damage was lower or similar. In conclusion, these results supported the usefulness of aided phytostabilisation of MTE-highly contaminated soils. 相似文献
9.
Putri Anissa Ratna Fujimori Takashi Takaoka Masaki 《Journal of Material Cycles and Waste Management》2018,20(4):2140-2149
Journal of Material Cycles and Waste Management - In Jakarta, Indonesia, municipalities collect plastic mixed with other waste, scavengers recover plastic waste by picking through waste, and some... 相似文献
10.
Núria Marbà Dorte Krause-Jensen Birgit Olesen Peter B. Christensen Anissa Merzouk Joao Rodrigues Susse Wegeberg Robert T. Wilce 《Ambio》2017,46(1):119-131
Ascophyllum nodosum is a foundation macroalgae of the intertidal zone that distributes across latitude 41.3–69.7°N. We tested the hypothesis that growth of A. nodosum near the northern distribution edge increases with warming. We retrospectively quantified the growth of eight A. nodosum populations at West Greenland and North Norway (from 64°N to 69°N). For seven populations, we measured growth rates since 1997–2002 and for one of them we extended the time series back to 1956 using published estimates. Individuals at northern populations elongated between 2.0 and 9.1 cm year?1 and this variability correlated with temperature and annual ice-free days. A spatial comparison of A. nodosum growth across the species distribution range showed that Northern (and coldest) populations grew at the slowest rates. Our results demonstrate that arctic climate change enhances the growth of A. nodosum populations and suggest that their productivity may increase in response to projected global warming. 相似文献
1