The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Nadine Pascal - One of the best experts on this subject based on the ideXlab platform.
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Inhibition of carotenoid biosynthesis in Sycamore cells deprived of iron
Plant Physiology and Biochemistry, 1995Co-Authors: Nadine Pascal, Maryse A. Block, K. E. Pallett, Jacques Joyard, Roland DouceAbstract:The growth of Sycamore (Acer pseudoplatanus L.) cells in a medium devoid of iron induced a reduction of the level of colored carotenoids to about half of the initial value (on the basis of cell number) after 7 days of culture. However, the decrease in the carotenoid content of Sycamore cells deprived of iron did not equally affect all xanthophylls and carotenes: about 60% of lutein and of β-carotene but only 30% ov violaxanthin remained after 7 days of growth. Together with the reduction of the amount of colored carotenoids, we have observed that Sycamore cells grown in a medium devoid of iron accumulate marge amounts of phytoene and, to a lesser extent, of phytofluene
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Inhibition of fatty acid desaturation in Sycamore cells deprived of iron
FEBS letters, 1994Co-Authors: Nadine Pascal, Albert-jean DomeAbstract:The growth of isolated Sycamore cells in a medium devoid of iron induced a marked reduction of the unsaturation level of fatty acids: the proportion of linolenic acid (C18:3) in polar lipids (phospholipids and galactolipids) decreased whereas a parallel increase in the proportions of oleic (C18:1) and linoleic (C18:2) acid was observed. In our experimental conditions, no direct effect of iron deprivation on fatty acid and glycerolipid biosynthesis could be observed. When Sycamore cells were incubated in the presence of [14C]acetate, the level of unsaturation in fatty acids was very strongly reduced: no polyunsaturated fatty acids were synthesized in iron-deprived cells: only [14C]palmitic and [14C]oleic acids accumulated in glycerolipids. In contrast, Sycamore cells grown in an iron-containing medium in the presence of [14C]acetate were able to synthesize glycerolipids containing 14C-labelled C18:2 and C18:3. We concluded that, in Sycamore cells, iron is essential for C18:1 → C18:2 → C18:3 desaturations. In contrast, C18:0 → C18:1 desaturation is much less sensitive to iron deprivation under our experimental conditions.
Roland Douce - One of the best experts on this subject based on the ideXlab platform.
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Inhibition of carotenoid biosynthesis in Sycamore cells deprived of iron
Plant Physiology and Biochemistry, 1995Co-Authors: Nadine Pascal, Maryse A. Block, K. E. Pallett, Jacques Joyard, Roland DouceAbstract:The growth of Sycamore (Acer pseudoplatanus L.) cells in a medium devoid of iron induced a reduction of the level of colored carotenoids to about half of the initial value (on the basis of cell number) after 7 days of culture. However, the decrease in the carotenoid content of Sycamore cells deprived of iron did not equally affect all xanthophylls and carotenes: about 60% of lutein and of β-carotene but only 30% ov violaxanthin remained after 7 days of growth. Together with the reduction of the amount of colored carotenoids, we have observed that Sycamore cells grown in a medium devoid of iron accumulate marge amounts of phytoene and, to a lesser extent, of phytofluene
Chen Luo - One of the best experts on this subject based on the ideXlab platform.
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Identification of an alarm pheromone-binding chemosensory protein from the invasive Sycamore lace bug Corythucha ciliata (Say).
Frontiers in physiology, 2018Co-Authors: Fu Ningning, Hetang Chang, Ran Wang, Xu Yihua, Chen LuoAbstract:The spread of the exotic insect pest Sycamore lace bug Corythucha ciliata (Say) is increasing worldwide. The identification of behaviorally active compounds is crucial for reducing the current distribution of this pest. In this study, we identified and documented the expression profiles of genes encoding chemosensory proteins (CSPs) in the Sycamore lace bug to identify CSPs that bind to the alarm pheromone geraniol. One CSP (CcilCSP2) that was highly expressed in nymph antennae was found to bind geraniol with high affinity. This finding was confirmed by fluorescence competitive binding assays. We further discovered one candidate chemical, phenyl benzoate, that bound to CcilCSP2 with even higher affinity than geraniol. Behavioral assays revealed that phenyl benzoate, similar to geraniol, significantly repelled Sycamore lace bug nymphs but had no activity toward adults. This study has revealed a novel repellent compound involved in behavioral regulation. And, our findings will be beneficial for understanding the olfactory recognition mechanism of Sycamore lace bug and developing a push-pull system to manage this pest in the future.
Albert-jean Dome - One of the best experts on this subject based on the ideXlab platform.
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Inhibition of fatty acid desaturation in Sycamore cells deprived of iron
FEBS letters, 1994Co-Authors: Nadine Pascal, Albert-jean DomeAbstract:The growth of isolated Sycamore cells in a medium devoid of iron induced a marked reduction of the unsaturation level of fatty acids: the proportion of linolenic acid (C18:3) in polar lipids (phospholipids and galactolipids) decreased whereas a parallel increase in the proportions of oleic (C18:1) and linoleic (C18:2) acid was observed. In our experimental conditions, no direct effect of iron deprivation on fatty acid and glycerolipid biosynthesis could be observed. When Sycamore cells were incubated in the presence of [14C]acetate, the level of unsaturation in fatty acids was very strongly reduced: no polyunsaturated fatty acids were synthesized in iron-deprived cells: only [14C]palmitic and [14C]oleic acids accumulated in glycerolipids. In contrast, Sycamore cells grown in an iron-containing medium in the presence of [14C]acetate were able to synthesize glycerolipids containing 14C-labelled C18:2 and C18:3. We concluded that, in Sycamore cells, iron is essential for C18:1 → C18:2 → C18:3 desaturations. In contrast, C18:0 → C18:1 desaturation is much less sensitive to iron deprivation under our experimental conditions.
Christian Ammer - One of the best experts on this subject based on the ideXlab platform.
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A review of growth and stand dynamics of Acer pseudoplatanus L. in Europe: Implications for silviculture
Forestry, 2009Co-Authors: Sebastian Hein, Noël Le Goff, Jens Peter Skovsgaard, Christian Ammer, Christophe Collet, Peter SavillAbstract:Sycamore (Acer pseudoplatanus L.) is a widespread but minor species throughout Europe though there is a growing interest in using it more because of its potentially high economic and ecological values. Silvicultural recommendations for exploiting Sycamore's full potential should aim at producing a maximum of about 750-1000 m(3) ha(-1) of high-quality timber on the best sites (depending upon region), on short rotations (c. 70-75 years). About 11-12 m of clear bole should be achievable. This can be achieved in a number of ways including the creation of mixed-species and structurally diverse stands that will simultaneously increase ecological values. This review synthesizes existing knowledge on the growth and development of Sycamore that may be used as a basis for developing silvicultural recommendations. Sycamore regenerates easily, although competing ground vegetation, damage by browsers and bark stripping by grey squirrels can reduce the amounts of valuable timber. Existing yield models show that it grows rapidly for the first 20-25 years and then slows considerably. Because of its relative scarcity and the fact that it seldom grows in pure stands, there has been limited interest in the species for growth model development and this has restricted its inclusion in forest growth simulators. This review shows that there is currently a lack of detailed knowledge about the responses of Sycamore to various environmental, ecological and silvicultural factors and this hinders the understanding and management of this valuable broadleaved tree.
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growth and nutrition of young european ash fraxinus excelsior l and Sycamore maple acer pseudoplatanus l on sites with different nutrient and water statuses
European Journal of Forest Research, 2008Co-Authors: G Weberblaschke, R Heitz, M Blaschke, Christian AmmerAbstract:This study aimed to improve knowledge about the nutritional status, site requirements and site classification for European ash (Fraxinus excelsior L.) and Sycamore maple (Acer pseudoplatanus L.) by reinvestigating young plantations from 1991/1992 on windfall-affected areas in Bavaria/Germany after another decade. Compared to the first survey in 1995, most stands improved their nutritional status until 2006. With the data set of element concentrations in leaves of ash and Sycamore available, the range of adequate nutrition could be determined for these species in the pole stage phase. Both species show considerable height growth on a wide range of sites. Mean annual height growth of dominant Sycamore trees increased with rising foliar N or P concentrations but not for Ca, Mg, K, Mn, Fe and Al. For ash, there was no relationship between the foliar nutrient level of any element and mean annual height growth. However, total height around age 20 was favourably influenced by high base saturation and a good water supply at well-drained sites. On acid soils, where nutrients are delivered by subsurface water flow, well-growing stands are found as well. Soil water status according to the state forest soil classification had no significant impact on mean annual height growth. Ash and Sycamore show reduced productivity on some (moderately) dry soils and fail on poorly drained moist sites. Based on these results, the classification of forest sites suitable for ash and Sycamore within the Bavarian study sites was revised.
