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| Registros recuperados: 96 | |
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| Oliveira,Adilson Serafim de; Ferreira,Cristiane Silva; Graciano-Ribeiro,Dalva; Franco,Augusto César. |
| Wetlands are common in the Cerrado (Brazilian savannas) biome, however flooding of these wetlands impairs growth and development of most plants. We evaluated flood tolerance of typical Cerrado trees. Seedlings of Aspidosperma macrocarpon (Apocynaceae), Tabebuia rosea (Bignoniaceae), Handroanthus chrysotrichus (Bignoniaceae), Myracrodruon urundeuva (Anacardiaceae), Kielmeyera coriacea (Calophyllaceae) and Copaifera langsdorffii (Fabaceae) were flooded up to the stem base for 30 days. Stems with cortical cracks, secondary aerenchyma and hypertrophic lenticels were observed in flooded plants of M. urundeuva,H. chrysotrichus and T. rosea while adventitious roots were formed in flooded plants of T. rosea and H. chrysotrichus. However, only T. rosea developed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aerenchyma; Biomass partitioning; Flood tolerance; Hypoxia; Water stress. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000400478 |
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| Martinez, Mauro; Arata, Agustín Francisco; Lázaro, Laura; Stenglein, Sebastian Alberto; Dinolfo, María Inés. |
| Waterlogging stress is one of the abiotic factors which causes damage to crops affecting yield components and grain quality of wheat and barley. On the other hand, Fusarium poae is one of the most common Fusarium species isolated from wheat and barley. The aim of this study was to evaluate the effects of waterlogging and F. poae on disease parameters, yield components and grain quality of durum and bread wheat and barley. The experiment was carried out using pots under greenhouse conditions. Four treatments were applied: control/control (W0F0), control/F. poae (W0F1), waterlogging/control (W1F0) and waterlogging/F. poae (W1F1). The results showed that incidence, severity and FHB index of F. poae were higher in W0F1 compared to W1F1 suggesting that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Disease parameters; Hordeins; Hypoxia; Glutenins; Grain quality; Severity.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42629 |
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| Casarotto, Gabriele; Kaspary, Tiago Edu; Cutti, Luan; Thomas, André Luis; Barbosa Neto, Jose Fernandes. |
| The flooded environment brings about injuries to soybeans that vary depending on the adaptation ability of the genotype. Oxygen deprivation promotes the induction of the expression of genes related to glycolysis and fermentation pathways to maintain energy metabolism and, in addition to reducing-power consuming processes, act in the formation of adaptive structures and the maintenance of the redox status of the plant. The aim of this work was to evaluate the relative expression of genes related to soil flooding response in two contrasting soybean cultivars. Soybean plants of the sensitive (BRS 154) and tolerant (I27) cultivars at the V1 development stage were submitted to the flooding and control conditions (without flooding) for 0, 24, 48, and 96 hours.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max (L.) Merr.; Hypoxia; Abiotic stress; Metabolic alterations; RT-qPCR.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42709 |
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| Martinez, Mauro; Arata, Agustín Francisco; Lázaro, Laura; Stenglein, Sebastian Alberto; Dinolfo, María Inés. |
| Waterlogging stress is one of the abiotic factors which causes damage to crops affecting yield components and grain quality of wheat and barley. On the other hand, Fusarium poae is one of the most common Fusarium species isolated from wheat and barley. The aim of this study was to evaluate the effects of waterlogging and F. poae on disease parameters, yield components and grain quality of durum and bread wheat and barley. The experiment was carried out using pots under greenhouse conditions. Four treatments were applied: control/control (W0F0), control/F. poae (W0F1), waterlogging/control (W1F0) and waterlogging/F. poae (W1F1). The results showed that incidence, severity and FHB index of F. poae were higher in W0F1 compared to W1F1 suggesting that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Disease parameters; Hordeins; Hypoxia; Glutenins; Grain quality; Severity.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42629 |
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| Silveira, Helbert Rezende de Oliveira; Universidade Federal de Lavras; Santos, Meline de Oliveira; Universidade Federal de Lavras; Alves, Jose Donizeti; Universidade Federal de Lavras; Souza, Kamila Rezende Dázio de; Universidade Federal de Lavras; Andrade, Cinthia Aparecida; Universidade Federal de Lavras; Alves, Raphaella Gomes Martins; Universidade Federal de Lavras. |
| The objective of the present study was to evaluate the interference of water excess in soil on the growth of young coffee plants of the Mundo Novo and Catuaí cultivars.Plants were subjected to the following three different substrate water availability conditions: control (well-watered), continuous substrate waterlogged, and intermittent substrate waterlogged. Several growth-related traits were evaluated over the course of 19 weeks. Based on the number and quality of the affected variables from all forms of analyses, the Catuaí cultivar showed greater sensitivity to waterlogging. Both cultivars exhibited growth inhibition in response to substrate waterlogging stress, which was exacerbated by premature leaf dropping. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.01.00.00-9; 5.01.03.00-8 soil waterlogging; Hypoxia; Mundo novo cultivar; Catuaí cultivar 5.01.03.06-7. |
| Ano: 2014 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17557 |
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| Pontara, Vanessa; Bueno, Marcelo Leandro; Scremin-Dias, Edna. |
| The aim of this study was to analyze the effect of flooding in Triplaris gardneriana Wedd, cultivated in drained soil (control) and in flooded condition. The experiment was developed in a greenhouse, using plants with 90 days after the emergency. The response to treatment was evaluated at 0, 30, 60 and 90 days. Growth measurements were made, such as biomass allocation, relative growth rate (RGR). Adventitious roots were not measured only observed, as well as the development of hypertrophied lenticels. The RGR was continuously reduced along the 90 days in flooding conditions for the roots, stem and leaves, compared to control. The flooding of the substrate caused alterations such as: increasing of the cortex width and diameter of the central cylinder of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ciências Biológicas; Botânica Pantanal; Hypoxia; RGR; Flooding Botânica. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/31267 |
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| Heon Ryu,Mi; Hee Park,Jeong; Eun Park,Ji; Chung,Jin; Hun Lee,Chang; Ryoun Park,Hae. |
| Tumor cells are often found under hypoxic conditions due to the rapid outgrowth of their vascular supply, and, in order to survive hypoxia, these cells induce numerous signaling factors. Akt is an important kinase in cell survival, and its activity is regulated by the upstream phosphoinositide 3-kinase (PI3K) and receptor tyrosine kinases (RTKs). In this study, we examined Akt activation and RTKs/PI3K/Akt signaling using the hypoxia-mimetic cobalt chloride in oral squamous carcinoma cells. Cobalt chloride increases Akt phosphorylation in both a dose- and time-dependent manner. Blocking the activation of the PI3K/Akt pathway using LY294002 abolished Akt activation in response to cobalt chloride, suggesting that Akt phosphorylation by cobalt chloride is... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hypoxia; DNA synthesis; S-phase. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452010000100003 |
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| GAMBOA,JORGE; CACEDA,RICARDO; GAMBOA,ALFREDO; MONGE-C,CARLOS. |
| Red blood cell carbonic anhydrase (CA) activity has not been studied in high altitude natives. Because CA is an intraerythocytic enzyme and high altitude natives are polycythemic, it is important to know if the activity of CA per red cell volume is different from that of their sea level counterparts. Blood was collected from healthy subjects living in Lima (150m) and from twelve subjects from Cerro de Pasco (4330m), and hematocrit and carbonic anhydrase activity were measured. As expected, the high altitude natives had significantly higher hematocrits than the sea level controls (p=0.0002). No difference in the CA activity per milliliter of red cells was found between the two populations. There was no correlation between the hematocrit and CA activity. |
| Tipo: Journal article |
Palavras-chave: Carbonic anhydrase; Hypoxia; Polycythemia. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000300006 |
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| ITURRIAGA,RODRIGO. |
| Nitric oxide (NO) has been proposed as an inhibitory modulator of carotid body chemosensory responses to hypoxia. It is believed that NO modulates carotid chemoreception by several mechanisms, which include the control of carotid body vascular tone and oxygen delivery and reduction of the excitability of chemoreceptor cells and petrosal sensory neurons. In addition to the well-known inhibitory effect, we found that NO has a dual (dose-dependent) effect on carotid chemoreception depending on the oxygen pressure level. During hypoxia, NO is primarily an inhibitory modulator of carotid chemoreception, while in normoxia NO increased the chemosensory activity. This excitatory effect produced by NO is likely mediated by an impairment of mitochondrial electron... |
| Tipo: Journal article |
Palavras-chave: Carotid body; Chemoreceptor; Cytochrome oxidase; Hypoxia; Nitric oxide; Oxidative phosphorylation. |
| Ano: 2001 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000200019 |
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| Kissmann,Camila; Habermann,Gustavo. |
| In this descriptive paper, we described germination responses of Styrax pohlii, S. camporum and S. ferrugineus seeds at 5, 10, 15, 20, 25, 30, 35, 40 and 45 °C. We also assessed the percentage germination (%G) of S. pohlii seeds with different seed water contents because, as a forest species, it seems to have recalcitrant seed behavior. Intrigued by the capacity of seeds of this species to germinate directly from puddles formed on poorly drained soils of riparian forests, where it typically occurs, we also tested the effect of de-pulping fruits on germination of S. pohlii seeds under hypoxia and normoxia conditions. In addition, we checked whether distinct concentrations of gibberellic acid (GA3) could break S. ferrugineus seed dormancy, a typical seed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hypoxia; Styrax pohlii; S. camporum; S. ferrugineus; Temperature; Desiccation seed tolerance. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052013000300001 |
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| KALININ,A. L.; SEVERI,W.; GUERRA,C. D. R.; COSTA,M. J.; RANTIN,F. T.. |
| Ventilation volume (<img src="http:/img/fbpe/rbbio/v60n2/a08vg.gif" alt="a08vg.gif (265 bytes)" align="absmiddle"> mlH2O.min1 ), respiratory frequency (fR breaths.min1) and tidal volume (V T mlH2O.breath1 ) were measured in a group of Piaractus mesopotamicus (650.4 ± 204.7 g; n = 10) during normoxia and in response to graded hypoxia. The fR was maintained constant, around 100 breaths.min1, from normoxia until the O2 tension of the inspired water (PiO2) of 53 mmHg, below which it increased progressively, reaching maximum values (157.6 ± 6.3 breaths.min1) at 10 mmHg. The V T rose from 1.8 ± 0.1 to 6.0 ± 0.5 and 5.7 ± 0.4 mlH2O. breath1 in the PiO2 of 16 and 10 mmHg, respectively. The <img src="http:/img/fbpe/rbbio/v60n2/a08vg.gif"... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hypoxia; Normoxia; Ventilatory parameters; Buccal and opercular volumes; Piaractus mesopotamicus. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200008 |
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| Marshall,J.M.. |
| This review describes the ways in which the primary bradycardia and peripheral vasoconstriction evoked by selective stimulation of peripheral chemoreceptors can be modified by the secondary effects of a chemoreceptor-induced increase in ventilation. The evidence that strong stimulation of peripheral chemoreceptors can evoke the behavioural and cardiovascular components of the alerting or defence response which is characteristically evoked by novel or noxious stimuli is considered. The functional significance of all these influences in systemic hypoxia is then discussed with emphasis on the fact that these reflex changes can be overcome by the local effects of hypoxia: central neural hypoxia depresses ventilation, hypoxia acting on the heart causes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hypoxia; Adenosine; Chemoreceptors; Vasodilatation; Noradrenaline. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000700002 |
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| Registros recuperados: 96 | |
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