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| Registros recuperados: 153 | |
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| Williams,Earle; Dall' Antonia,Alaor; Dall' Antonia,Vitoria; Almeida,Jorge Mathias de; Suarez,Francisco; Liebmann,Brant; Malhado,Ana Claudia Mendes. |
| The most severe drought in tropical South America during the 20th century occurred in 1926. This extreme El Nino year is further documented anecdotally, in an update of the river stage observations at Manaus, and in annual rainfall records. The annual rainfall anomaly is an east-west dipole over tropical South America, with drought to the west over the Amazon basin whose discharge is documented at Manaus, and with a surplus to the east and including the Nordeste region of Brazil. Speculations about a role for aerosol in aggravating the drought are discussed. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rainfall; Climatic history; Drought. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672005000200013 |
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| Nurrohman, Reza Kusuma; Nugroho, Bayu Dwi Apri; Sudira, Putu; Ngadisih, Ngadisih; Murtiningrum, Murtiningrum. |
| Rainfall distribution pattern is very important for sustainable production in the agricultural sector in Tropical region. The near future rainfall amount under changing climate was predicted from 2009 to 2028 by Adaptive Neuro Fuzzy Inference System (ANFIS), which was trained with the rainfall observation data from 1979 to 2013, spatiotemporally in the Central Java Province, Indonesia. Our analysis showed that the predicted rainfall data using ANFIS can represent actual rainfall conditions. Rainfall predicted from 2009 – 2028 in Central Java will experience a decrease in high rainfall in an area of 1615125,2 hectare, which can cause drought. The area that predicted to experience drought in the future are Kebumen, Jepara, Pati, Rembang, Kudus, Grobogan,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climate Change; Rainfall Pattern; ANFIS; Drought; Central Java. |
| Ano: 2021 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6461 |
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| Bilibio, Carolina; Hensel, Oliver. |
| Evapotranspiration covers are key to minimizing water percolation in waste systems. On potash tailings piles, evapotranspiration covers are important because they may decrease the leaching of brines generated from precipitation erosion. Considering this, the water deficit of four different potash tailings piles covering materials were evaluated using the CropWat model. This study was based on a lysimeter experiment carried out in Heringen, Germany. The experiment consisted of 4 different technogenic substrates made of municipal incineration wastes and coal combustion residues covered with a mixture of perennial grasses. By using the FAO CropWat model, the effective precipitation, crop evapotranspiration, actual evapotranspiration and the water deficit were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Effective precipitation; Drought; Perennial ryegrass; Lysimeters; Crop coefficient. |
| Ano: 2021 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6327 |
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| Dawood, Mona Gergis. |
| Two field experiments were conducted during two successive seasons (2014/2015 and 2015/2016) at the Experimental Station of National Research Centre, Nubaria district, Beheira Governorate, Egypt, to study the effect of foliar treatment of quinoa plants with trehalose (Tre) (100µM and 500µM) on growth, photosynthetic pigments, seed yield quantity & quality, in fever of nutritional and antioxidant compounds in the yielded quinoa seeds which subjected to water deficiency (skipping two irrigation times at 50 & 60 days after sowing). Water deficiency caused marked decreases in quinoa plant growth parameters (shoot height, fresh and dry weights of shoot/plant) and photosynthetic pigments with marked increases in root growth parameters (root length, fresh... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidant activity; Drought; Flavonoids; Oil; Phenolics; Protein; Quinoa; Trehalose. |
| Ano: 2018 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4539 |
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| SARUHAN,NESLIHAN; TERZI,RABIYE; SAGLAM,AYKUT; KADIOGLU,ASIM. |
| The ascorbate-glutathione (ASC-GSH) cycle has an important role in defensive processes against oxidative damage generated by drought stress. In this study, the changes that take place in apoplastic and symplastic ASC-GSH cycle enzymes of the leaf and petiole were investigated under drought stress causing leaf rolling in Ctenanthe setosa (Rose.) Eichler (Marantaceae). Apoplastic and symplastic extractions of leaf and petiole were performed at different visual leaf rolling scores from 1 to 4 (1 is unrolled, 4 is tightly rolled and the others are intermediate forms). Glutathione reductase (GR), a key enzyme in the GSH regeneration cycle, and ascorbate (ASC) were present in apoplastic spaces of the leaf and petiole, whereas dehydroascorbate reductase (DHAR),... |
| Tipo: Journal article |
Palavras-chave: Ctenanthe setosa; Antioxidant enzymes; Antioxidant substances; Drought; Leaf rolling. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000300006 |
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| ASHKAVAND,PEYMAN; ZARAFSHAR,MEHRDAD; TABARI,MASOUD; MIRZAIE,JAVAD; NIKPOUR,AMIRREZA; BORDBAR,SEYED KAZEM; STRUVE,DANIEL; STRIKER,GUSTAVO GABRIEL. |
| We studied the physiological responses of Prunus mahaleb (Mahaleb) seedlings to drought stress when previously irrigated (or not) with different concentrations of SiO2 nanoparticles (SNPs). SNPs were applied at four concentrations (0, 10, 50 and 100 mg L-1) for 45 days, and then seedlings were subjected to three watering treatments including low (300 mL water every 3 d), moderate (150 mL water every 3 d) and severe drought stress (no irrigation) for 19 days. Results showed that gas exchange photosynthesis, stomatal conductance, and transpiration rate were significantly less impacted by severe drought stress when seedlings were pretreated with SNPs at high concentrations. Beneficial effects of SNPs pretreatment were evident in the nutritional status of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pre-treatment; Silica nanoparticles; Drought; Stress alleviation; Photosynthesis.. |
| Ano: 2018 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722018000200007 |
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| Blain,Gabriel Constantino. |
| The aim of this study was to describe monthly series of the Standardized Precipitation Index obtained from four weather stations of the State of São Paulo, Brazil. The analyses were carried out by evaluating the normality assumption of the SPI distributions, the spectral features of these series and, the presence of climatic trends in these datasets. It was observed that the Pearson type III distribution was better than the gamma 2-parameter distribution in providing monthly SPI series closer to the normality assumption inherent to the use of this standardized index. The spectral analyses carried out in the time-frequency domain did not allow us to establish a dominant mode in the analyzed series. In general, the Mann-Kendall and the Pettitt tests... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pearson type III distribution; Drought; Climate trends. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052012000100018 |
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| Stolf,Renata; Medri,Moacyr Eurípedes; Pimenta,José Antônio; Boeger,Maria Regina Torres; Dias,Jaqueline; Lemos,Noélle Giacomini; Oliveira,Maria Cristina Neves de; Brogin,Rodrigo Luís; Yamanaka,Naoki; Neumaier,Norman; Farias,José Renato Bouça; Nepomuceno,Alexandre Lima. |
| In a greenhouse experiment, morpho-anatomical and micromorphometrical analyses of two soybean cultivars, MG/BR46 (Conquista) and BR16-tolerant and sensitive to drought, respectively-were used to study their water-deficit-tolerance strategies. Drought treatments were applied at reproductive stages from R2 to R7, where evaluations were conducted at 30 days and 45 days after stress started, respectively. The total length of Conquista plants (shoot + root) was greater than of BR16 plants. Pod dry weight was adversely affected due to the lack of moisture, decreasing productivity even of Conquista plants. Both the cultivars had normal development of root hairs; however, it was observed a decrease in the cortex:central cylinder ratio in BR16 stressed for 30 days,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anatomy; Leguminous; Drought; Root. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000600002 |
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| Marchese,José A.; Ferreira,Jorge F.S.; Rehder,Vera L.G.; Rodrigues,Osmar. |
| Despite the importance of Artemisia annua L. as the only source of the anti-parasitic drug artemisinin, little is known on the effects of biotic and abiotic stress on artemisinin accumulation. Water deficit is the most limiting factor on plant growth, however it can trigger secondary metabolite accumulation, depending on the plant growth stage and intensity. A. annua cultivated in growth chambers was submitted to five water deficit treatments (watered, 14, 38, 62 e 86 hours without irrigation). Water deficits of 38 and 62 hours (Yw = -1.39 and -2.51 MPa, respectively) increased leaf artemisinin content, but only 38 hours led to a significant increase in both leaf and plant artemisinin (29%), with no detriment to plant biomass production. The other... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Malaria; Secondary metabolism; Terpene; Drought; Water stress. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000100001 |
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| Registros recuperados: 153 | |
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