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Registros recuperados: 8
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Deficit irrigation in grapevine cv. Syrah during two growing seasons in the brazilian semiarid REA
Bassoi,Luís H.; Correia,Joselina de S.; Santos,Ana R. L. dos; Silva,Juliano A.; Costa,Bruno R. S..
Irrigation plays an important role for grape’s yield as well as on its quality for winemaking. Thus, the effects of deficit irrigation strategies on yield and quality of wine grapes cv. Syrah were evaluated in Petrolina, State of Pernambuco, Brazil. Evaluations were carried out throughout the second and third growing seasons, which were from November 2010 to February 2011 (rainy season) and from May to September 2011 (dry season), respectively. Vines were drip irrigated and the experimental design was completely randomized with three treatments and four replications. The treatments were full irrigation (FI), performed according crop evapotranspiration; regulated deficit irrigation (RDI), in which irrigation was interrupted in phenological growth stage of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vitis vinifera L.; Soil water content; Leaf water potential.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000300430
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Effect of leaf Water potential on cold tolerance of Coffea arabica L. BABT
Caramori,Lázara Pereira Campos; Caramori,Paulo Henrique; Manetti Filho,João.
Young coffee plants from cultivar Mundo Novo of Coffea arabica were grown without irrigation for 32 consecutive days, to evaluate the effect of leaf water potential on damage caused by low temperatures, under controlled conditions. A wide range of leaf water potentials were evaluated, from - 0.45MPa (wet soil) at the beginning of the experimental period, to - 4.8MPa (severe leaf wilting) at the end. Results showed that under moderate water stress, there was a higher frequency of undamaged plants and lower frequency of severely damaged plants. These results help explain part of the regional variability observed after a frost and stress the importance of new studies associating cold and drought tolerance in coffee.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cold tolerance; Coffee; Leaf water potential; Water stress.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000600006
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Effect of water stress on nitrogen fixation and nodule structure of common bean PAB
Ramos,Maria Lucrecia Gerosa; Parsons,Richard; Sprent,Janet Irene; James,Euan Kelvin.
The aim of this work was to investigate the effect of water stress on N2 fixation and nodule structure of two common bean (Phaseolus vulgaris L.) cultivars Carioca and EMGOPA-201. Plants were harvested after five and eight days of water stress. Carioca had lower nodule dry weight on both water stress periods; shoot dry weight was lower at five days water stress and did not differ from control after eight days stress. Both cultivars had lower nitrogenase activity than control after five and eight days water stress. For both cultivars, after eight days stress bacteroid membranes were damaged. Carioca presented more pronounced damage to infected tissue, with host cell vacuolation and loss of the peribacteroid membrane at five days after stress; at eight days...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phaseolus vulgaris; Nitrogenase; Leaf water potential; Nodulation.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000300002
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Freeze tolerance differs between two ecotypes of Paspalum vaginatum (Poaceae) Acta Botanica
Fabbri,Liliana Teresa; Ploschuk,Edmundo Leonardo; López,María Virginia; Insausti,Pedro; Rua,Gabriel Hugo.
Morphological and physiological responses to freezing were evaluated in two ecotypes of the perennial turfgrass Paspalum vaginatum. Leaf extension rate, number of active meristems, leaf water potential and net photosynthesis were measured on plants of both a commercial cultivar, 'Sea Isle 2000', and a wild ecotype from the Flooding Pampa grasslands of Argentina. Plants were propagated by cloning, cultivated in pots, and examined during 18 consecutive days under two treatments: a non-frozen control treatment (15.5±7 ºC) and a frozen treatment with two stages: Stage 1 with four hours of freezing stress for 10 nights (-5ºC), and Stage 2 with 12 hours of freezing stress for eight nights (five nights at -5ºC and three nights at -8ºC). After these treatments,...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Freezing tolerance; Leaf water potential; Meristem injury; Paspalum vaginatum; Photosynthesis; Seashore paspalum; Turfgrass.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100152
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Response of a clingstone peach cultivar to regulated deficit irrigation Scientia Agricola
Sotiropoulos,Thomas; Kalfountzos,Dimitrios; Aleksiou,Ioannis; Kotsopoulos,Spyros; Koutinas,Nikolaos.
Regulated deficit irrigation (RDI) involves inducing water stress during specific fruit growth phases by irrigating at less than full evapotranspiration. The objectives of this research were to study the effects of RDI perfomed at stage II of fruit growth and postharvest, on productivity of clingstone peaches, fruit quality as well as photosynthetic rate and midday leaf water potential. The research was conducted in a commercial clingstone peach (Prunus persica L. Batch cv. A-37) orchard in Greece. Trees were irrigated by means of microsprinklers and their frequency was determined using local meteorological station data and the FAO 56 Pennman-Monteith method. Photosynthetic rate was measured by a portable infrared gas analyzer. Midday leaf water potential...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fruit drop; Leaf water potential; Photosynthetic rate; Water savings.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200006
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Silicon and boron mitigate the effects of water deficit on sunflower AGRIAMBI
Neves,Jose M. G.; Aquino,Leonardo A. de; Berger,Paulo G.; Neves,Júlio C. L.; Rocha,Genelício C.; Barbosa,Edimilson A..
ABSTRACT The objective of this study was to evaluate the effect of Ca and Mg silicate and B on the gas exchange, leaf water potential and chlorophyll fluorescence parameters in the sunflower variety Embrapa 122 -V2000 under water stress conditions. The trial was conducted in Red Yellow Latosol with very clayey texture, with contrasting levels of Si and B and subjected to water deficit. The experimental design was randomized blocks in a 24 factorial arrangement, with five replicates. Treatments consisted of the combination of two acidity corrective agents (calcium magnesium silicate and dolomitic limestone), two levels of base saturation (30 and 70%), two levels of B (0.18 mg dm-3 - value available in the soil and 1.20 mg dm-3) and two water regimes (with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Helianthus annuus; Chlorophyll fluorescence; Gas exchange; Leaf water potential.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000300175
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Soil moisture and soybean physiology affected by drought in an integrated crop-livestock system PAB
Martins,Amanda Posselt; Costa,Sérgio Ely Valadão Gigante de Andrade; Anghinoni,Ibanor; Kunrath,Taise Robinson; Cecagno,Diego; Reichert,José Miguel; Balerini,Fabrício; Dillenburg,Lúcia Rebello; Carvalho,Paulo César de Faccio.
Abstract: The objective of this work was to evaluate the impact of grazing intensities after 11 years of an integrated crop-livestock system, under no-tillage, on soil moisture and soybean physiological parameters during a summer season affected by drought. The experiment was established in 2001 on a Rhodic Hapludox. Treatments consisted in the succession of soybean (summer) and a mixed pasture of black oat + Italian ryegrass (winter), under different beef-cattle grazing intensities: intensive grazing, with 0.10-m pasture height; moderate grazing, with 0.20-m pasture height; and no grazing. During the soybean cycle, in the 2011/2012 crop season, rainfall was 40% of the climatological normal. The soil moisture was within the limits of available water both...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Leaf temperature; Leaf water potential; Water availability.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000800978
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Water stress before harvest of pepper-rosmarin PAB
Alvarenga,Ivan Caldeira Almeida; Valadares,Rafael Vasconcelos; Martins,Ernane Ronie; Oliveira,Flávio Gonçalves; Figueiredo,Lourdes Silva de; Kobayashi,Mauro Koji.
The objective of this work was to assess the effect of different periods of water stress before harvest of pepper-rosmarin (Lippia sidoides) on the contents of essential oil and flavonoids. The experiment was carried out during 270 days of cultivation, with drainage lysimeters, in a completely randomized block design with five treatments: 0, 2, 4, 6, and 8 days of water suppression before harvest, with four replicates. Fresh and dry matter yield, essential oil content, total flavonoids content, and water potential and temperature of leaves were determined. There was a decrease of approximately 50% in oil content and of 60% in total flavonoid content with the reduction of leaf water potential in 0.3 MPa. Essential oil is more sensitive to water stress than...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lippia sidoides; Essential oil; Flavonoids; Leaf water potential; Medicinal plant; Water stress.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000700005
Registros recuperados: 8
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