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E. Atalah C. M. Hernández‐Cruz R. Ganga E. Ganuza T. Benítez‐Santana J. Roo H. Fernández‐Palacios M. S. Izquierdo 《Aquaculture Research》2012,43(12):1816-1827
The objective of this study was to determine the effect of dietary vitamin E on gilthead seabream (Sparus aurata) growth and survival, at two different highly unsaturated fatty acids (HUFAs) levels. Eighteen days old gilthead seabream larvae were fed four formulated experimental diets combining two different dietary levels of HUFAs (M: medium 2.5 + 1.5, DHA + EPA, H: high 5 + 2.5 DHA + EPA g per 100 g) with two different levels of vitamin E (M: medium 540 mg kg?1, H: high 2900 mg kg?1): MM, MH, HM, HH (HUFA/vitamin E). After 2‐week feeding trial, the average survival rate was 52.6% and there were no significant differences found among treatments. Increase in vitamin E up to high level markedly improved larval growth, particularly when dietary HUFA levels were lower, suggesting a higher protection value when these fatty acids are more limiting. At medium dietary HUFA levels, increase in vitamin E from medium to high level enhanced larval growth performance in terms of total length. Moreover, increase in vit E enhanced HUFAs content in the larval polar lipids denoting the anti‐oxidative effect of vitamin E. 相似文献
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Organic carbon storage in soils of the Basque Country (Spain): the effect of climate,vegetation type and edaphic variables 总被引：8，自引：0，他引：8
This study was performed to identify the environmental factors that control soil organic carbon (SOC) accumulation in the Basque Country (Northern Spain) and to evaluate the impact of land use change on SOC budget in this territory. A total of 30 samples of the organomineral horizon were taken under representative vegetation types including native forest, coniferous plantations, scrub, pasture and cultures. The edaphic variables measured were organic C content, pH, total N, available P, exchangeable H+ and Al3+, cation exchange capacity (CEC), texture, and carbonates. The substitution of the original forest with a pasture led to a significant increase in organic C content of the topsoil in all cases studied. Temperature was the main climatic factor affecting the organic C levels in soil, being the two variables negatively correlated. The CEC and texture were other key factors controlling the organic C content, which increased with CEC and decreased with total sand. Average organic C content of the organomineral horizon did not differ significantly (P <0.05) with base content of original substrate nor climate type, but it was more sensitive to climate change in the Atlantic soils than in the Mediterranean ones, where edaphic variables such as CEC and texture were important in regulating C sequestration. 相似文献
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M. Ganuza N. Pastor J. Erazo J. Andrés M. M. Reynoso M. Rovera A. M. Torres 《European journal of plant pathology / European Foundation for Plant Pathology》2018,151(1):257-262
In this work, a bioformulation containing Trichoderma harzianum strain ITEM 3636, an effective biocontrol agent against the peanut pathogen Fusarium solani, was evaluated for control of peanut smut, an emergent disease caused by Thecaphora frezii. The performance of the bioformulation was evaluated during seasons 2014/2015 and 2015/2016 in experimental fields with history of peanut smut. Inoculation with T. harzianum ITEM 3636 significantly reduced the severity of peanut smut during both seasons by 17% and 25%, respectively. This is the first report where a consistent decrease of peanut smut symptoms is achieved in field experiments using a potential biological control agent. The identity of the causal agent of peanut smut was confirmed by sequencing the D1/D2 DNA region. T. harzianum ITEM 3636 caused significant increases in grain weight/plant in both years. Peanut smut and brown root rot are diseases that cause severe economic losses. Both causal agents may be present in the soil and, depending on environmental factors, cause disease. The T. harzianun ITEM 3636 bioformulation has high potential for controlling both diseases. Thus, the application of a single bioformulation could protect the health of peanut plants against two high impact pathogens. 相似文献
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Eyad Atalah Carmen María Hernández‐Cruz Eneko Ganuza Tibiabin Benítez‐Santana Rachid Ganga Javier Roo Daniel Montero Marisol Izquierdo 《Aquaculture Research》2011,42(9):1261-1268
Together with docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), arachidonic acid (ARA) is being considered to be an essential fatty acid in marine fish larval diets. The objective of the present study was to determine the importance of dietary ARA levels for larval European sea bass performance, when EPA and DHA are also present in the diet. Eighteen‐day‐old larvae were fed, for 14 days, gelatine‐based microdiets containing the following ARA levels: 0.3%, 0.6% or 1.2%. Elevation of dietary ARA up to 1.2% showed a positive correlation with larval survival and a significant improvement in the specific growth rates, body weight and total length. Arachidonic acid was efficiently incorporated into larval lipids, even at a higher proportion than that in the diets. Increased accumulation of ARA did not affect the incorporation of DHA or EPA from the diet into larval total lipids. A significant positive correlation was found between dietary ARA levels and survival after handling stress, indicating the importance of this fatty acid in sea bass larvae response to acute stressors. The results show the importance of ARA for sea bass larvae, but higher dietary levels should be tested to determine whether there is a negative effect of ARA in sea bass as reported for other species. 相似文献
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