Field investigations and multi‐indicators for shallow water lagoon management: perspective for societal benefit

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FTA® card tool for sampling and rapid diagnosis of bacterial diseases from rainbow trout (Oncorhynchus mykiss) tissue

The collection of farmed fish samples and subsequent diagnosis of microbial pathogens can be difficult and time-consuming procedure under field conditions. Correct diagnosis and identification of bacterial diseases agents (Yersinia ruckeri, Flavobacterium psychrophilum, Lactococcus garvieae, and Vagococcus salmoninarum) are crucial for the effective treatment. In this study, the feasibility of using FTA® card (Flinders Technology Associates filter papers) for sampling infected rainbow trout (Oncorhynchus mykiss) tissues and significantly accelerated the molecular diagnosis of enteric redmouth disease, rainbow trout fry syndrome, bacterial coldwater disease, lactococcosis associated with fatal hemorrhagic septicemia, and vagococcosis were evaluated. We also examined and compared a practical and reliable extraction obtained from immobilized DNA on FTA® card with one commonly used commercial kit to diagnose bacterial pathogens in fish tissues. Results proved that the active working time of extracting DNA from FTA® card is requiring only 30 min and the cost is less than USA $ 0.5 for each eluted sample. A total of hundred extracted DNA from tissues on FTA® card were tested and showed successful PCR amplification of the aroA, murG, pLG, and pSa1 genes. In conclusion, our finding indicates FTA® card as an appropriate tool for the simple collection, easy transfer, and stored at room temperature without contamination and retrieval of high-quality DNA for rapid molecular diagnosis of bacterial fish pathogens without isolation and culture.

     

Effect of Dietary Herbal Supplements on Some Physiological Conditions of Sea Bass Dicentrarchus labrax

Abstract

This study was conducted in order to investigate the effects of dietary thyme Thymus vulgaris, rosemary Rosmarinus officinalis, and fenugreek Trigonella foenum graecum as feed additives on total liver fat levels and biometric indices of Sea Bass Dicentrarchus labrax. Four isonitrogenous (48% crude protein) and isocaloric (21 kJ/g) diets were formulated to contain 0% (control), or 1% of thyme, rosemary, or fenugreek. In a 45-d feeding trial, 12 fiberglass tanks (140 L) were each stocked with 17 fish (20.43 ± 0.03 g). Herbal supplemented diets significantly decreased the total liver fat, visceral fat index, viscerosomatic index, hepatosomatic index, and increased the spleen–somatic index and bile–somatic index (P < 0.05). In conclusion, the results indicated that a dietary level of 1.0% for thyme, rosemary, or fenugreek could improve some of the physiological parameters of Sea Bass. Thus, this work provides a new perspective for the use of medicinal herbs that can be added to fish feed to improve the status of fish organs. Thyme, rosemary, and fenugreek contain a number of different active components, which possibly play an important role in improving these conditions, but the mechanism by which this is achieved needs further and more detailed study.

Received July 19, 2012; accepted January 15, 2013     

Identification and structure of six members of the hexokinase gene family in Vitis vinifera: Cloning,expression, and functional analysis of a putative chloroplast stromal-type hexokinase

Summary

Hexokinase catalyses the first step in the metabolism of glucose, but has also been proposed to be involved in sugar sensing and signalling in both yeasts and plants. The substrates of hexokinase such as glucose (Glc) and fructose (Fruc) are also the most important sugars during grape berry ripening. The grapevine proteome database was analysed to investigate the roles of hexokinases in grape berry growth and development. Six hexokinase genes displaying high nucleotide sequence identity (72 – 87%) with hexokinase genes in other species were identified. Most of the Vitis vinifera hexokinase (VvHXK) genes had a highly conserved genomic structure consisting of nine exons and eight introns. A search for cis–regulatory elements in the promoter regions of all six hexokinase genes revealed that most were probably regulated by light, sugar, phytohormones, or abiotic stress. The isolation and expression of a hexokinase cDNA from V. vinifera ‘Sultanine’, named VvHXK3, was also reported. Analysis of the predicted amino acid sequence of VvHXK3 suggested that the protein could be a chloroplast-stromal hexokinase with a possible transit peptide cleavage site after amino acid residue 26. The VvHXK3 gene was differentially expressed in a variety of organs including berries, leaves, roots, and pollen, but its expression was highest in berries during their early development and at the start of ripening. To determine its function, VvHXK3 cDNA was expressed in a triple mutant yeast strain that lacked the ability to phosphorylate Glc and Fru and, therefore, was unable to grow on these sugars as sole carbon source. Mutant yeast cells that expressed VvHXK3 grew on both Glc and Fru, indicating that VvHXK3 could complement this mutant and had hexokinase activity.     

Sustainable Forestry in Turkey

Sustainable forestry is considered as one of the most important focal points for sustainable development, as it is part of the United Nations Conference on Environment and Development held in Rio in 1992 which followed the completion of “Our Common Future.” To this end, many studies have been carried out on implementing of sustainable forestry at the global level.

Geographically, Turkey can be seen as part of Pan-European and Near East sustainable forestry initiatives. Forest organizations have carried out many studies to implement the decisions made with these initiatives in line with their own needs in forest management. While conducting studies in the framework of the National Forestry Program prepared within this context, people have been confronted with various problems due to insufficient infrastructure and implementation difficulties. This article provides information on sustainable forestry leading to observations and suggestions relevant for Turkey.     

Effects of the Progesterone Receptor Antagonist Aglepristone on Implantation Administered on Days 6 and 7 after Mating in Rabbits

There is no safe and accurate method for early termination of pregnancy in the rabbit. So this study was carried out to determine the effect of aglepristone administration in preventing early pregnancy before implantation in this species. Twenty‐two animals (10–12 months old, New Zealand White rabbits) were naturally mated and pregnancies were confirmed in all animals by ultrasonographic examinations on day 6 after mating (5–7.5 MHz linear array transducer Dynamic Imaging Sonostar, UK) and the animals were grouped randomly: Group I & Group III: Aglepristone (Alizin^®, Virbac; 10 mg/kg, subcutaneously) was injected twice, 24 h apart, on days 6 and 7 after mating (n = 5; n = 8). Group II & Group IV: The same volume of 0.9% NaCl solution was subcutaneously injected in the same interval and served as controls (n = 5; n = 3). Ultrasonographical examination of the uterus was performed daily from day 7 to day 11 post‐mating to test aglepristone efficiency. Blood samples were collected between days 6 and 30, centrifuged at 3070 g for 10 min and stored at ?20°C. The does in aglepristone groups (Group I, III) were not pregnant whereas all animals in control groups were pregnant (Group II, IV). The does in group I & III were examined only clinically and ultrasonographically; however, does in groups III and IV were laparomized on days 6, 7, 9 and 11 post‐mating to control countable implantation sites. No implantation sites were present in group III whereas they were seen obviously in group IV. Side effects were not observed. The mean serum progesterone (P4) concentrations were not significantly different between control and treated does (p > 0.05). The results indicate that aglepristone treatment on days 6 and 7 after mating could prevent pregnancy after unwanted matings without any side effects in the rabbit. Aglepristone treatments are possibly not affecting further fertilities before implantation.     

Proteolytic and Sensory Changes During Marination of Rainbow Trout (Oncorhynchus mykiss) Flesh in Pomegranate Juice

Suitability of pomegranate juice (PJ) alone or mixed with acetic acid versus acetic acid control solution, a traditional fish marinating media, was investigated in this research. With that purpose, rainbow trout fillets were marinated for 12 days at 4°C in one of three different marinating solutions: 100% acetic acid solution (AAS), 50% acetic acid/50% pomegranate juice solution (AAPJS), and 100% pomegranate juice solution (PJS). Moisture content and pH value of rainbow trout flesh decreased, whereas fat, protein, ash, and salt contents increased at the end of the marinating process for all treatments (p < 0.05). Fish flesh marinated in solution containing PJ had darker, more red and lower yellow color values due to migration of color components from the PJ (p < 0.01). Traditionally marinated fish flesh had the highest total free amino acid amount (p < 0.01) due to a higher level of proteolytic breakdown under the low pH condition, which could be seen on sodium dodecyl sulfate polyacrylamide gel electrophoresis image. This treatment also had higher sensory scores than those of fish marinated in solution containing 50% or 100% PJ. In addition, fish marinated in AAPJS and PJS solution had firmer texture and sweeter taste compared to that of marinated in AAS.     

Fatty Acids Profile,Atherogenic, Thrombogenic,and Polyene Lipid Indices in Golden Grey Mullet (Liza aurata) and Gold Band Goatfish (Upeneus moluccensis) from Mediterranean Sea

ABSTRACT

The aim of this work was to study the seasonal variations of the proximate compositions, fatty acids contents, and related lipid indices (atherogenic index [AI], thrombogenic index [TI], and polyene index [PI]) of golden grey mullet (Liza aurata) and gold band goatfish (Upeneus moluccensis) caught from the northeastern Mediterranean Sea. Proximate compositions and fatty acid contents of both fish species showed statistically significant seasonal variations (p < 0.05). The lipid contents were highest in autumn and lowest in winter in golden grey mullet and gold band goatfish. The main saturated and unsaturated fatty acids were palmitic acid (C16:0), stearic acid (C18:0), palmiteoleic acid (C16:1n-7), oleic acid (18:1n-9c), arachidonic acid (C20:4n-6), eicosapentaenoic acid (EPA, C20:5n-3), and docosahexaenoic acid (DHA, C22:6n-3). The total polyunsaturated fatty acids in gold band goatfish did not show any differences among the seasons, whereas that in golden grey mullet was highest in winter. Levels of EPA, DHA, and n-3/n-6 ratios, as well as AI, TI, and PI, were significantly changed among seasons. The results show that golden grey mullet and gold band goatfish, which are among the important fish in Turkey and of commercial value, are a good source for human consumption in terms of their nutritional quality.     

Evaluation of the efficacy for reducing copper use against downy mildew control in organic Mediterranean viticulture

Protection against downy mildew in organic viticulture is exclusively based on the use of copper products but these cause environmental concerns. The aim of this work was to assess a control strategy under Mediterranean climatic conditions with the goal of reducing the quantities of copper allowed under organic viticulture. The control strategy was based on the use of copper oxychloride with varying doses and intervals between their applications. The efficiency of the control was assessed based on the incidence and severity of the disease in grape leaves and bunches. The products used ensured effective control under moderate disease pressure. It was found that during seasons with a low pressure of downy mildew attack, it is possible to contain the fungus respecting the ceiling prescribed by the organic regulations. Otherwise, when the pressure of the fungus is high, in the case of humid and rainy seasons, it is not possible to respect the limit. Organic growers can minimize the use of copper in organic viticulture by using copper-alternatives when downy mildew infection is intermediate or low.     

Early‐stage screening for heat tolerance in cotton

The study aimed to identify early‐stage traits of cotton for heat tolerance using multitrait approach reflecting field yield performance. Seedling growth and physiological response of 16 cultivars to high temperature were investigated at three different developmental stages and four heat stress conditions in a climate chamber. Some traits such as hypocotyl dry weight, leaf pigment contents and cellular respiration were significantly correlated with previously known yield of ten cultivars grown in the hot field conditions. Sixteen cotton cultivars were classified for their heat tolerance by principle component analysis (PCA) using yield‐correlated physiological traits. As a result, we showed that heat tolerance classification of cultivars based on PCA significantly coincided with the yield results of cultivars grown in hot field. As a conclusion, yield‐correlated physiological traits determined in the study may facilitate selection of heat‐tolerant cotton genotypes at early stage. In addition, yield‐correlated early‐stage traits can be used in phenotyping for QTL and association mapping studies to develop selection markers for heat tolerance.