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Registros recuperados: 11
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Isolation and physiological characterization of two novel, piezophilic, thermophilic chemolithoautotrophs from a deep-sea hydrothermal vent chimney ArchiMer
Takai, Ken; Miyazaki, Masayuki; Hirayama, Hisako; Nakagawa, Satoshi; Querellou, Joel; Godfroy, Anne.
P>Two novel, thermophilic piezophiles, capable of chemolithoautotrophic growth, are successfully cultivated and isolated from a black smoker chimney at the TAG field (Mid Atlantic Ridge: MAR) by using a piezophilic cultivation technique. Both strains (strains 106 and 108) represent dominant cultivated populations of the microbial communities in the chimney surface habitat. Strain 106 represents typically thin, long spiral cells under the piezophilic growth condition but short bent cells under the non-piezophilic condition. It is a strictly chemolithoautotrophic gammaproteobacterium using reduced sulfur compounds as the electron donors, and nitrate and O-2 as the electron acceptors. Based on the 16S rRNA gene sequence, strain 106 would represent a novel...
Tipo: Text Palavras-chave: Sp. nov.; Ecological signifiance; Hydrostatic pressure; Subsurface biosphere; Base composition; High temperature; Membrane lipids; Gen. nov.; Microorganisms; Diversity.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6652.pdf
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Performance of Different Tomato Genotypes in the Arid Tropics of Sudan during the Summer Season. I. Vegetative Growth JARTS
Abdelmageed, Adil H.A.; Gruda, Nazim; El-Balla, Mustafa Mohamed Ali.
Selected, eleven tomato genotypes of diverse origin were grown in a glasshouse of the Humboldt University of Berlin, Germany during 2002 and under field conditions in Shambat, University of Khartoum, Sudan for two successive seasons (2002/2003, 2003/2004). High temperatures under field conditions resulted in poor stand and stunted growth of tomato plants. Highly significant differences were encountered among the different genotypes for leaf area, leaf area ratio, leaf weight ratio, stem fresh and dry weight and leaf fresh and dry weight. Based on results obtained from this study, the genotype ‘Summerset’ proved to be more tolerant under high temperature conditions in comparison to other investigated genotypes and may be useful for exploitation under arid...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Plant production tomato; Genotypes; Heat tolerance; High temperature; Vegetative growth.
Ano: 2010 URL: http://www.jarts.info/index.php/jarts/article/view/28
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Performance of Different Tomato Genotypes in the Arid Tropics of Sudan during the Summer Season. II. Generative Development JARTS
Abdelmageed, Adil H.A.; Gruda, Nazim.
Eleven tomato genotypes of diverse origin were grown in Shambat, University of Khartoum, Sudan, in a randomized block design with three replications for two successive seasons (2002/2003, 2003/2004). The same genotypes were firstly evaluated under glasshouse conditions at the Humboldt University of Berlin, Germany during 2002. Highly significant differences were encountered among the different genotypes for most of the generative characters, such as number of days to flowering, number of flowers per plant, number of fruits per plant, fruit fresh weight per plant and fruit set percentage. Based on results obtained from this study, the genotype ‘Summerset’ proved to be high yielding under high temperature conditions in comparison to other genotypes.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Plant production tomato; Genotypes; Heat tolerance; High temperature; Vegetative growth.
Ano: 2010 URL: http://www.jarts.info/index.php/jarts/article/view/29
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Pollen viability of Tepary bean (Phaseolus acutifolius A. Gray.) mutant lines under water stress conditions and inoculation with rhizobia Acta Agron. (Palmira)
Crespo-Muñoz,Sergio; Rivera-Peña,Mariela; Rosero-Alpala,Deisy Alexandra; Muñoz-Florez,Jaime Eduardo; Rao,Idupulapati M; Muñoz-Florez,Ligia Carmenza.
Abstract Tepary bean, Phaseolus acutifolius A. Gray, is tolerant to drought and high temperatures but has low genetic diversity in its cultivated forms. To increase this diversity, a research program on mutation induction was initiated. The aim of this study was to establish the effect of different agro-morpho-physiological parameters on pollen viability and quantity in 123 mutant lines M5 of P. acutifolius and parental genotypes, by processing micrographs of pollen stained with acetocarmine. The experiment was conducted under greenhouse conditions and the experimental design was a split-split plot with three replicates; in addition, the factors evaluated were as follows: soil moisture conditions, inoculation with Bradyrhizobium sp. or Rhizobium tropici,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Abiotic stress; High temperature; Humidity content; Fabaceae; Rhizobiaceae; Inoculation; Mutation induction.
Ano: 2018 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000200319
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Purification and characterization of a thermostable alkaline cellulase produced by Bacillus licheniformis 380 isolated from compost Anais da ABC (AABC)
MARCO,ÉVILIN G. DE; HECK,KARINA; MARTOS,EMERSON T.; VAN DER SAND,SUELI T..
ABSTRACT During composting processes, the degradation of organic waste is accomplished and driven by a succession of microbial populations exhibiting a broad range of functional competencies. A total of 183 bacteria, isolated from a composting process, were evaluated for cellulase activity at different temperatures (37, 50, 60, and 70°C) and pH values. Out of the 22 isolates that showed activity, isolate 380 showed the highest cellulase activity. Its ability to produce cellulase was evaluated in culture medium supplemented with carboxymethyl cellulose, microcrystalline cellulose, wheat straw, and rice husk. The culture medium supplemented with carboxymethyl cellulose induced higher enzyme activity after 6 hours of incubation (0.12 UEA mL-1 min-1). For...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alkalophilic enzyme; Carboxymethyl celullase; Compost; High temperature.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502359
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Temperature response of photosynthesis and its interaction with light intensity in sweet orange leaf discs under non-photorespiratory condition Ciência e Agrotecnologia
Ribeiro,Rafael Vasconcelos; Machado,Eduardo Caruso; Oliveira,Ricardo Ferraz de.
This study aimed to evaluate the response of photosynthesis (A), given by photosynthetic O2 evolution, to increasing temperature from 25 to 50ºC in sweet orange (Citrus sinensis (L.) Osbeck) leaf discs under non-photorespiring conditions. In order to evaluate the response of gross photosynthesis to temperature and the balance between photosynthetic and respiratory activities, respiration (Rd) rates were also measured, i.e. the O2 uptake in each temperature. In addition, light response curves of photosynthesis were performed by varying the photosynthetic photon flux density (PPFD) from 0 to 1160 µmol m-2 s-1 at 25 and 40ºC. The highest A values were observed at 35 and 40ºC, whereas the highest Rd values were noticed at 50ºC. A higher relationship A/Rd was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Citrus sinensis; Heat stress; High temperature; O2 evolution.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542006000400012
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The chlorophyll a fluorescence as an indicator of the temperature stress in the leaves of Prunus persica Braz. J. Plant Physiol.
Martinazzo,Emanuela Garbin; Ramm,Aline; Bacarin,Marcos Antonio.
Plants growing in temperate regions are often exposed to stress conditions caused by high temperatures. Photosynthesis is one of the metabolic processes most sensitive to high temperature stress, and it is often inhibited before other cellular functions. Using peach leaf disks, we studied the transient chlorophyll a fluorescence along with the gas exchanges at temperatures of 25 (control) 30, 35, 40 and 45°C in the dark for a period of 30 minutes. Temperatures above 35°C caused significant changes in the transient fluorescence of chlorophyll a, including an increase in the initial fluorescence (F0), a decrease in maximum fluorescence values (F M) and the appearance of K and L bands. The values of the net assimilation rate decreased as the temperature...
Tipo: Info:eu-repo/semantics/article Palavras-chave: High temperature; Photosynthesis; Prunus persica.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000400002
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Ultrastructure and biochemical traits of bread and durum wheat grains under heat stress Braz. J. Plant Physiol.
Dias,Ana S.; Bagulho,Ana S.; Lidon,Fernando C..
The yield and grain quality (as well as technological traits) of two heat-stressed genotypes of bread (Triticum aestivum L.) and durum wheat (Triticum turgidum subsp. durum) having different tolerance to high temperatures after anthesis were investigated. Heat stress, during grain filling, triggered grain shrinkage with a reduced weight and ultrastructural changes in the aleurone layer and in the endosperm cells. Heat stress also decreased the sedimentation index SDS, an effect associated with increased protein content in the grain but with decreased levels of essential amino acids. Although the responses to heat stress were similar among the Triticum genotypes, it is further suggested that during grain filling, high temperatures might affect gluten...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Grain weight; Grain quality; High temperature; Triticum aestivum; Triticum turgidum subsp. durum.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000400008
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Variability of isolated colonies in bean nodulating Rhizobium strains before and after exposure to high temperature BJM
Raposeiras,Rui; Pinto,Patrícia P.; Passos,Raul V.M.; Seldin,Lucy; Paiva,Edilson; Scotti,M. Rita; Sá,Nadja M.H..
Irregular response to bean plants to Rhizobium inoculation has been attributed to among other factors, low competitive ability, low N2 fixation efficiency and genetic instability of the symbiont. This genetic instability caused by high rates of genomic rearrangements and/or plasmid deletions can be accentuated by high temperatures. This fact may limit the utilization of these strains as inoculants, especially in tropical soils. In this study, the variability of isolated colonies derived from effective R. leguminosarum bv. phaseoli (SLP1.3 and BR 10.026) and R tropici (SLA2.2 and BR322) strains was evaluated before and after exposure to high temperatures (four consecutive thermal shocks at 45ºC). This evaluation involved plant dry matter analysis of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Rhizobium tropici; Rhizobium leguminosarum bv. phaseoli; Bean plants; High temperature; Cerrado soils.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000200010
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การคัดเลือกสายพันธุ์ข้าวกลายพันธุ์หอมนิลจากโครงการ TILLING ให้ทนทานต่อสภาพอุณหภูมิสูงในระยะเจริญพันธุ์ ภายใต้อุโมงค์จำลองสภาวะโลกร้อน Thai Agricultural
Nat Panichawong; Sulaiman Je-arbu; Boonthong Wasuri; Thiwa Phakoktoom; Phoonphipob Kasemsub; Apichart Vanavichit; Chanate Malumpong.
High temperatures during reproductive stages causes male sterility and fertilization failures resulting in yield decreasing dramatically. The purpose of this study was selecting rice mutant lines that tolerant to high temperatures during reproductive stages. The simulation tunnel for global warming condition was controlled gradually increasing temperature from the real environment temperature (25-30 degrees Celsius) in the morning to 40 to 45 degrees Celsius at 10 am and remain this condition for 6 hours and then the system in the tunnel was decreased the temperature to equal outside temperature at night time. For the fast screening of Hom nin mutant1,500 lines found that the mutants lines showed both tolerance and non-tolerance for high temperature...
Tipo: Collection Palavras-chave: Rice; Selection; High temperature; Heat tolerance; ข้าว; การคัดเลือก; อุณหภูมิสูง; การทนต่อร้อน; พันธุ์กลาย; พันธุ์หอมนิล.
Ano: 2012 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5375
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ผลของการบ่มข้าวเปลือกที่อุณหภูมิและความชื้นสัมพัทธ์สูงต่อความหนืดและโครงสร้างโมเลกุลขององค์ประกอบในแป้งข้าวเหนียวและแป้งข้าวเจ้า Thai Agricultural
Parichat Hongsprabhas; Natdanai Fafaungwithayakul; Teerarat Likitwattanasade.
This study investigated the influences of paddy aging at 60 C and 70% relative humidity for 5 days on pasting properties of rice flours and molecular structures of major constituents in rice grain. The rice cultivars investigated included waxy rice Sanpah-Tawng 1 (SPT1), which contained 1.3% amylose and 8.3% protein. Non-waxy rice paddies; namely Pathum Thani 1 (PTT1), which had 14.1% amylose and 6.7% protein, as well as and Leuang Pratew 123 (LPT123), which contained 28.6% amylose and 9.6% protein, were also investigated. Paddy aging significantly changed the RVA pasting characteristics of rice flour pastes from all cultivars investigated (p<0.05). All aged rice flour pastes had higher final viscosity than that of new rice flour paste. Fourier...
Tipo: Collection Palavras-chave: Paddy aging; Molecular structure; Protien; Rice flour; High temperature; Relative humidity; Viscosity; ข้าวเปลือก; การบ่ม; โครงสร้างโมเลกุล; โปรตีน; แป้งข้าว; อุณหภูมิ; ความชื้นสัมพัทธ์; ความหนืด.
Ano: 2012 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5327
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