Consulta: subjectFacets:"Environmental stress"
Registros recuperados: 21
Data/hora: 11/06/2024 11:38:49

1,3-Propanediol production from crude glycerol by Clostridium butyricum DSP1 in repeated batch
Provedor de dados: 69
Autores: Szymanowska-Powalowska,Daria.
Background The production of biofuels from renewable energy sources is one of the most important issues in industrial biotechnology today. The process is known to generate various by-products, for example crude glycerol, which is obtained in the making of biodiesel from rapeseed oil. Crude glycerol may be utilized in many ways, including microbial conversion to 1,3-propanediol (1,3-PD), a raw material for the synthesis of polyesters and polyurethanes. Results The paper presents results of a study on the synthesis of 1,3-propanediol from crude glycerol by a repeated batch method with the use of Clostridium butyricum DSP1. Three cycles of fermentation medium replacement were carried out. The final concentration of 1,3-PD was 62 g/L and the maximum...
Tipo: Journal article
Palavras-chave: Environmental stress; Fermentation; High-performance liquid chromatography.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600011

Expression of bacterial genes in transgenic tobacco: methods, applications and future prospects
Provedor de dados: 69
Autores: Jube,Sandro; Borthakur,Dulal.
Tobacco is the most commonly used plant for expression of transgenes from a variety of organisms, because it is easily grown and transformed, it provides abundant amounts of fresh tissue and has a well-established cell culture system. Many bacterial proteins involved in the synthesis of commercial products are currently engineered for production in tobacco. Bacterial enzymes synthesized in tobacco can enhance protection against abiotic stresses and diseases, and provide a system to test applied strategies such as phytoremediation. Examples of bacterial gene expression in tobacco include production of antigen proteins from several human bacterial pathogens as vaccines, bacterial proteins for enhancing resistance against insects, pathogens and herbicides,...
Tipo: Journal article
Palavras-chave: Biotechnology; Environmental stress; Insect/pathogen/herbicide resistance; Phytoremediation; Transgenics; Vaccine production.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300013

Identifying water stress-response mechanisms in citrus by in silico transcriptome analysis
Provedor de dados: 74
Autores: Torres,Gisele A.M.; Gimenes,Marcos A.; Rosa Jr.,Vicente E. de; Quecini,Vera.
Water deficit is one of the most critical environmental stresses to which plants are submitted during their life cycle. The evolutionary and economic performance of the plant is affected directly by reducing its survival in the natural environment and its productivity in agriculture. Plants respond to water stress with biochemical and physiological modifications that may be involved in tolerance or adaptation mechanisms. A great number of genes have been identified as transcriptionally regulated for water deficit. EST sequencing projects provide a significant contribution to the discovery of expressed genes. The identification and determination of gene expression patterns is important not only to understand the molecular bases of plant responses but also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental stress; CitEST; Data mining; Tolerance mechanisms; Water deficit.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000500018

Tohu-va-Vohu of the quasi-stochastic phytoplankton in the Sea of the Galilee
Provedor de dados: 13
Autores: Kamenir, Y.
The stability analysis of natural communities and ecosystems requires quantitative means capable of evaluating the structural variability of the aquatic community or assemblage taken as a whole. Size spectrum (SS) provides such assessment and is most often applied to the size distribution of particles or organisms of the given community. Another old, but rarely used, special case of SS describes the size-frequency distribution of taxonomic units encompassed by an assemblage, and is called here 'taxonomic size spectrum' (TSS). The phytoplankton assemblage of the sea of the Galilee (Lake Kinneret), Israel, was used to compare several years (out of the 30-year monitoring period) characterized with the most pronounced abnormalities in many biotic and abiotic...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Community structure; Taxonomic size spectra; Composite size spectra; Environmental stress; Lake Kinneret; Фитопланктон; Структура сообщества; Таксономический размерный спектр; Комплексный размерный спектр; Природный стресс; Озеро Киннерет Phytoplankton Phytoplankton http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/241

Review and perspectives of physiological mechanisms underlying genetically-based resistance of the Pacific oyster Crassostrea gigas to summer mortality
Provedor de dados: 5
Autores: Samain, Jean-francois.
French oyster farming has been subject to severe mortalities during the summer months. Results from the research program "Morest", which ran from 2000 to 2006 and examined the possible causes of these mortalities, led to the construction of a model to explain the interaction between environmental factors, oyster physiology and different opportunistic pathogens underlying oyster summer mortality. Temperature, food, reproduction and stress were the main factors required for oyster mortality. Genetically-based resistance ("R" oysters) or susceptibility ("S" oysters) to summer mortality was revealed by divergent selection. Building on these results, a literature search was made in 2007 on the molecular origin of genetic resistance to such a complex mortality...
Tipo: Text
Palavras-chave: Immunity; Antibacterial activity; Host defence; Environmental stress; Crassostrea gigas.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00051/16229/13752.pdf

Effet des conditions environnementales sur le développement des pathologies à Vibrio dans les élevages de crevettes en Nouvelle-Calédonie
Provedor de dados: 5
Autores: Lemonnier, Hugues.
Shrimp aquaculture in New Caledonia is a developing industry, exclusively based on the species Litopenaeus stylirostris. However, it is subject to mortalities during grow out as observed all over the world. Since 1993, shrimp reared during the cold period are affected by a disease named "syndrome 93". As a consequence, the whole industry has become seasonal and produces essentially during the warm season. The climatic conditions during the periods of transition between the two main seasons could be responsible for an environmental stress and the origin reason for mortality outbreaks. Stocking density is the main risk factor. It increases the probability of the appearance and development of the epizooty in the pond. The "Summer Syndrome", a septicemic...
Tipo: Text
Palavras-chave: New Caledonia; Risk factors; Environmental stress; Vibriosis; Epizooty; Pond management; Eutrophication; Pond health; Shrimp; Litopenaeus stylirostris; Peneids; Aquaculture; Nouvelle  Calédonie; Facteur de risque; Stress environnemental; Vibrioses; Pratiques d'élevage; Eutrophisation; Santé de l'écosystème bassin; Crevette; Litopenaeus stylirostris; Pénéides; Aquacultre.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/these-2643.pdf

Genetic diversity and environmental stress in Italian populations of the cyprinodont fish Aphanius fasciatus
Provedor de dados: 5
Autores: Cimmaruta, R; Scialanca, F; Luccioli, F; Nascetti, G.
Allozyme electrophoresis has been used to analyse the genetic structure of ten populations of the killifish, Aphanius fasciatus, sampled from Italian coastal brackish lagoons or salterns. The goal of the study was to compare the genetic structure of samples obtained from habitats characterised by environmental stress of different kinds, with the aim of gaining a better understanding of the relationships between the genetic variation of natural populations and environmental disturbance, either natural or man-made. Therefore, the sampling scheme has been planned to provide samples from both brackish habitats, characterised by natural stress with seasonal marked fluctuations of chemical and physical parameters, and from coastal lagoons suffering from a high...
Tipo: Text
Palavras-chave: Aphanius fasciatus; Hétérozygotie; Allozymes; Eaux saumâtres; Stress du milieu; Aphanius fasciatus; Heterozygosity; Allozymes; Brackish waters; Environmental stress.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00322/43290/43025.pdf

Shore-level size gradients and thermal refuge use in the predatory sea star Pisaster ochraceus: the role of environmental stressors
Provedor de dados: 5
Autores: Monaco, Cristian; Wethey, David S.; Gulledge, Shadow; Helmuth, Brian.
The body size of a mobile intertidal invertebrate can determine its access to different microhabitats, and thus alter its exposure to environmental stressors. We surveyed a rocky intertidal keystone predator, the sea star Pisaster ochraceus, and characterized size-dependent distribution, defined by individuals' shore level and refuge use. At 2 field sites (in California and Oregon, USA) we examined temporal and geographical variability in habitat selection. We evaluated the hypothesis that environmental drivers measured on-site and body temperatures measured using biomimetic sensors (i.e. 'robo-sea stars'), explained the observed distribution patterns, including shore-level size gradients, with larger animals lower on the shore. We tested the effect of...
Tipo: Text
Palavras-chave: Ecology; Physiology; Rocky intertidal; Environmental stress; Climate change; Temperature; Desiccation; Solar radiation; Body size; Behavior.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00605/71695/70137.pdf

Social dynamics obscure the effect of temperature on air breathing in   Corydoras   catfish
Provedor de dados: 5
Autores: Pineda, Mar; Aragao, Isabel; Mckenzie, David; Killen, Shaun S.
In some fishes, the ability to breathe air has evolved to overcome constraints in hypoxic environments but comes at a cost of increased predation. To reduce this risk, some species perform group air breathing. Temperature may also affect the frequency of air breathing in fishes, but this topic has received relatively little research attention. This study examined how acclimation temperature and acute exposure to hypoxia affected the air-breathing behaviour of a social catfish, the bronze corydoras Corydoras aeneus, and aimed to determine whether individual oxygen demand influenced the behaviour of entire groups. Groups of seven fish were observed in an arena to measure air-breathing frequency of individuals and consequent group air-breathing behaviour,...
Tipo: Text
Palavras-chave: Air-breathing fish; Environmental stress; Metabolic rate; Oxygen; Social behaviour.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00661/77271/78705.pdf

Seed priming and sulfur effects on soybean cell membrane stability and yield in saline soil
Provedor de dados: 86
Autores: Bejandi,Teymur Khandan; Sedghi,Mohammad; Sharifi,Raouf Seyed; Namvar,Ali; Molaei,Peyman.
The objective of this work was to determine the effects of seed priming and sulfur application on cell membrane characteristics, seedling emergence, chlorophyll content and grain yield of soybean (Glycine max) in saline soil. A complete-block design in 4x3 factorial arrangement with three replicates was used to test four types of seed priming (water, auxin, gibberellin and non-priming) and three levels of sulfate availability (0, 70 and 140 kg ha-1 K2SO4). The soil had a silty loam texture with an electrical conductivity of 3.61 ds m-1, a pH of 8.2 and a saturation percentage of about 46%. Seed priming had significant effects on mean emergence rate (MER), emergence percentage, relative water content (RWC) of leaves, relative chlorophyll content, time of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Chlorophyll content; Environmental stress; Injury index; Seedling emergence.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000900007

Responses of Conocarpus lancifolius to environmental stress: a case study in the semi-arid land of Kuwait
Provedor de dados: 85
Autores: Redha,A; Suleman,P; Al-Hasan,R; Afzal,M.
Cococarpus lancifolius Engl. grows wild in Djibouti, Somalia and East Africa, and South Asia. The species was introduced into Kuwait, where it is exposed to several stresses: oil pollution, salinity, high temperature and harsh climatic conditions. These conditions are prevalent in its semi-arid environment. In this study, the impact of salinity (2, 6 and 10%), temperature (20, 30 and 40 °C), polyethylene glycol (10, 30 and 60%) and drought has been investigated on C. lancifolius. Proline (Pro) accumulation (5.5 ± 0.03 µg/g dry weight; p=0.05-0.005), protein (16.47 ± 0.052 mg/g; p=0.001), free amino acids (10.92 ± 0.082 mg/g; p=0.006) and lipids (116.05 ± 2.17 µg/g; p=0.05) were measured in plants irrigated with 60% polyethylene glycol (PEG) for 6 days....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conocarpus lancifolius; Drought; Electron transport rate; Environmental stress; Salinity; Temperature; Photosynthesis.
Ano: 2012
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000200008

Flooding effects in seedlings of Cytharexyllum myrianthum Cham. and Genipa americana L.: responses of two neotropical lowland tree species
Provedor de dados: 88
Autores: ANDRADE,ANTÔNIO CARLOS SILVA DE; RAMOS,FLAVIO NUNES; SOUZA,ALEXANDRE FADIGAS DE; LOUREIRO,MARTA BRUNO; BASTOS,RODRIGO.
Six-month-old seedlings of Cytharexyllum myrianthum and Genipa americana, two common tree species in different flood-prone areas in Brazil, were flooded for up to 90 days to compare their survival and growth responses under these conditions. Seedlings of both species were found to be relatively tolerant to flooding but growth responses changed according to treatment and plant species. Growth of G. americana was reduced by flooding, showing a decrease in root and leaf dry mass, root/shoot ratio and height, without showing any adaptive morphological changes. On the other hand, growth of C. myrianthum seedlings was stimulated under flooding conditions, showing an increase in root dry mass, root/shoot ratio, height, stem diameter and some morphological changes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anaerobiosis; Environmental stress; Growth; Hypoxia; Submergence.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000500009

Exopolysaccharides produced by the symbiotic nitrogen-fixing bacteria of leguminosae
Provedor de dados: 90
Autores: Bomfeti,Cleide Aparecida; Florentino,Ligiane Aparecida; Guimarães,Ana Paula; Cardoso,Patrícia Gomes; Guerreiro,Mário César; Moreira,Fatima Maria de Souza.
The process of biological nitrogen fixation (BNF), performed by symbiotic nitrogen fixing bacteria with legume species, commonly known as α and β rhizobia, provides high sustainability for the ecosystems. Its management as a biotechnology is well succeeded for improving crop yields. A remarkable example of this success is the inoculation of Brazilian soybeans with Bradyrhizobium strains. Rhizobia produce a wide diversity of chemical structures of exopolysaccharides (EPS). Although the role of EPS is relatively well studied in the process of BNF, their economic and environmental potential is not yet explored. These EPS are mostly species-specific heteropolysaccharides, which can vary according to the composition of sugars, their linkages in a single...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exopolysaccharides; Nodules; Environmental stress; Soil aggregation; Rhizobia.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300001

Seedling growth of irrigated rice as a function of seed treatment with gibberellic acid
Provedor de dados: 22
Autores: Guadagnin, Cristina Mayumi Ide; Schuch, Luis Osmar Braga; Venske, Eduardo; Zimmer, Paulo Dejalma; Aumonde, Tiago Zanatta.
This study aimed to evaluate the early growth stages of irrigated rice (Oryza sativa L.) seedlings from cultivars SCS-112, BRS-7 Taim, BR IRGA 410 and IRGA 417, under three different temperatures, i.e. 15, 20 and 25 °C, as a result of seed imbibition in a gibberellic acid (GA3) solution at concentrations of  zero, 150, 300, 450, 600 and 750 mg L-1. The lengths of the shoot and the primary root of seedlings were recorded at three, seven and 21 days from sowings on germination paper. Interactions between the main factors were observed for all the response variables. Rice cultivars have differential sensitivity to variation in the concentration of gibberellic acid on seed treatment according to the temperature and the time of evaluation. Cultivar BRS-7 Taim...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental stress; Growth regulators; Oryza sativa L.; Seed vigor.
Ano: 2017
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/14299

Seed inoculation with Azospirilum brasiliense in corn plants submitted to water limitation
Provedor de dados: 22
Autores: Coelho, Antônio Eduardo; Tochetto, Cláudia; Turek, Thais Lemos; Michellon, Luiz Henrique; Fioreze, Samuel Luiz.
The objective of this work was to evaluate the seed inoculation with Azospirilum brasilense in corn plants under limitation of the water supply. Two assays were carried out in greenhouse conditions, using low nitrogen substrate pots. At first one, corn seeds were inoculated or not with A. brasilense and treated or not with a biostimulant (IBA+GA+KT). At the second experiment, two corn genotypes were inoculated or not with A. brasilense. In both assays, plants were submitted to limited condition of water supply at initial vegetative growth. During this period gas exchange parameters were determined at the plants. After stress period, dry matter and nitrogen content were determined in roots and above ground parts of the plants. In addition, substrate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diazotrophic bacterium; Environmental stress; Nitrogen; Zea mays.
Ano: 2017
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/14004

Factors affecting vegetable stand establishment
Provedor de dados: 63
Autores: Grassbaugh,E. M.; Bennett,M. A.
Several factors can influence stand establishment in vegetable crop production. Environmental conditions such as soil physical characteristics, temperature and moisture, various cultural practices, and diseases may all be limiting factors in establishing maximum stands and achieving the highest possible yields. Measures taken to increase stands include soil improvements, implementing cultural practices, and use of chemical and biological seed treatments. Combining seed treatments and cultural/tillage practices to minimize environmental constraints can lead to maximum stands and yields in the production of high quality vegetable crops.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stand establishment; Priming; Biological control; Environmental stress.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500021

Mechanisms of plant responses to global climate change
Provedor de dados: 106
Autores: Ed Sarobol.
Tipo: Collection
Palavras-chave: Agriculture; Climate change; Environmental stress; Stress; Hormone; Gene; Plant adaptation; เกษตรกรรม; การตอบสนองของพืช; การปรับปรุงพันธุ์พืช; การเปลี่ยนแปลงสภาพภูมิอากาศโลก; สภาพแวดล้อม; กลไกการทำงานของพืช; ความเครียด; ฮอร์โมน; ยีน; การปรับตัว.
Ano: 2011
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5123

Pathogenicity evaluation of Cytospora eucalypticola isolated from Eucalyptus spp: cankers in Uruguay
Provedor de dados: 102
Autores: Alonso,Raquel; Lupo,Sandra; Bettucci,Lina.
Cytospora eucalypticola has been frequently associated with twig and stem cankers and as endophyte of Eucalyptus globulus and E. grandis in Uruguay. Mycelium discs of two C. eucalypticola isolates obtained from actively growing colonies were inoculated, both superficially and on experimentally wounded stems of E. globulus and E. grandis. No inoculated and control plants have shown any discoloration, gumosis or necrosis nor did they display lesions ten months after inoculation. Callus tissue was formed, partially or wholly occluding the wounds. The ability to penetrate healthy tissues and the inability to produce lesions evidenced that the presence of C. eucalypticola in twig and stem cankers could result from saprotrophic expansion of the endophytic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Endophyte; Stem wound; Inouculation; Saprotrophic expansion; Environmental stress; Endofíto; Ferida do caule; Inoculação; Expansão saprofítica; Estresse abiótico.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000300012

River damming affects seedling communities of a floodplain forest in the Central Amazon
Provedor de dados: 39
Autores: Rocha,Maíra da; Feitosa,Yuri Oliveira; Wittmann,Florian; Piedade,Maria Teresa Fernandez; Resende,Angélica Faria de; Assis,Rafael Leandro de.
ABSTRACT The flood pulse of black water rivers in the Amazon basin determines the composition of species along the flood gradient in igapó forests. The Balbina dam, built on the Uatumã River, has altered the flood pulse and caused changes in the floristic composition of adult trees throughout the downstream area. There is a lack of studies on how communities of seedlings in igapó forests respond to changes in the flood pulse. This study investigates the response of seedling communities in the igapó forest downstream the Balbina dam and compares it with two pristine areas. The areas were sampled with transects of 1x25 m within 36 plots (25x25 m) along the flood gradient. Richness and dominance were calculated by simple regression and ordination analyses....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dams; Environmental stress; Flood gradient; Floodplain; Hydrologic cycle; Seedlings; Tropical rivers.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100192

Patterns of growth, development and herbivory of Palicourea rigida are affected more by sun/shade conditions than by Cerrado phytophysiognomy
Provedor de dados: 39
Autores: Moura,Renan Fernandes; Alves-Silva,Estevão; Del-Claro,Kleber.
ABSTRACT Plant development is influenced by several abiotic factors, which in turn influence morphological traits and life history. We investigated whether leaf area, herbivory, toughness, fluctuating asymmetry, structural complexity and the number of inflorescences of Palicourea rigida are influenced by sun/shade conditions or by Cerrado phytophysiognomy (typical cerrado or rupestrian field). We expected to find greater structural complexity, leaf toughness and more inflorescences in sun plants; shaded plants were expected to exhibit a greater degree of fluctuating asymmetry (an index of plant stress), reduced leaf toughness and greater herbivory. As for phytophysiognomies, we expected to find higher levels of leaf toughness and reduced structural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Environmental stress; Fluctuating asymmetry; Leaf area loss; Rubiaceae; Rupestrian grassland.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000200286

Sensitivity and Variability of Two Plant Water Stress Indicators: Exploring Criteria for Choosing a plant Monitoring Method for Avocado Irrigation Management
Provedor de dados: 117
Autores: Celedón,José M; Gil,Pilar M; Ferreyra,Raul; Maldonado,Patricio; Barrera,Cristián.
Avocado (Persea americana Mill.) is a fruit-tree species highly susceptible to water deficit, which makes irrigation management a difficult task for growers. When irrigation is inadequate, trees suffer growth reduction, fruit losses, and roots damage. This study addressed the question of how to assess water stress in avocado trees and the considerations to choose an indicator to measure the plant water stress. In this work the sensitivity and variability of two water stress indicators in response to water deficit were analyzed: stem water potential (SWP) and maximum daily trunk shrinkage (MDTS). During a period of high water demand, avocado trees planted in a clay loam soil were subjected to water stress by withholding irrigation and compared to control...
Tipo: Journal article
Palavras-chave: Dendrometers; Stem water potential; Environmental stress; Persea americana.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300012