|
|
|
| Registros recuperados: 220 | |
|
|
| Echer,Márcia de Moraes; Guimarães,Vandeir Francisco; Inagaki,Adriano Mitio; Dalastra,Graciela Maiara; Hachmann,Tiago Luan. |
| ABSTRACT The aim of the present study was to verify changes in the levels of photosynthetic pigments as well as gas exchange in the Fuyutoyo and Red Cabbage cultivars, grown under no-tillage (NT) and conventional (CT) systems. A randomised block design with four replications was used, in a 2 x 2 factorial scheme, where the Fuyutoyo and Red Cabbage cultivars were evaluated under two tillage systems. The levels of chlorophyll a, chlorophyll b, total chlorophyll and anthocyanins in the leaves were evaluated in triplicate. Localised gas exchange was measured at different times of the day, together with different photosynthetic photon flux density curves (PPFD). The Fuyutoyo cultivar showed a higher mean value for chlorophyll a (34.58%), chlorophyll b (35.09%)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Photosynthesis; Net CO2 assimilation rate; Crop management; Brassica oleracea var. capitata. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000200416 |
| |
|
|
| Gonçalves-Trevisoli, Edilaine Della Valentina; Dartora, Janaína; Mendonça, Heloísa Ferro Constâncio; Rissato, Bruna Broti; Dildey, Omari Dangelo Forlin; Coltro-Roncato, Sidiane; Santana, José Carlos de; Klosowski, Élcio Silvério; Echer, Marcia de Morais; Tsutsumi, Cláudio Yuji. |
| The aim of the work was to evaluate the growth and productivity of lettuce cultivars cultivated in greenhouse with and without thermo-reflective screens. The experiment was conducted in greenhouse in Assis Chateaubriand, Paraná State. The experimental design was in a randomized block design with six replications and treatments arranged in a 2 x 4 factorial. The first factor consisted of culture environments (with and without thermo-reflective screens 50%) and the second of four cultivars of lettuce (Itapuã, Paola, Vera and Verônica). Five samples were performed weekly for evaluation of dry matter and leaf area used to obtain the absolute and relative growth rates, net assimilation rates, leaf area ratio and specific leaf area. At the last evaluation were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Growth analysis; Photosynthesis; Lactuca sativa L.; Solar radiation.. |
| Ano: 2017 |
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/14033 |
| |
|
|
| Dalanhol, Samanta Jaqueline; Mantoan, Luís Paulo Benetti; Amaro, Amanda Cristina Esteves; Ferreira, Gisela. |
| The aim of this study was to evaluate the effects of the application of plant growth regulator on gas exchange in A. emarginata seedlings subjected to different NaCl concentrations. We evaluated the gas exchange in A. emarginata seedlings subject to the presence and absence of plant growth regulator consisting of kinetin, gibberellic acid, and indolbutyric acid and three concentrations of NaCl (0 mM, 50 mM, and 100 mM). When assessing these factors individually, it was observed that in the presence of plant growth regulators, there was a reduction in stomatal conductance and transpiration, and NaCl concentration (50 mM and 100 mM) caused a reduction in CO2 assimilation, stomatal conductance, and transpiration. There was no significant interaction between... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Auxin; Cytokinin; Gibberellin; Photosynthesis; Sodium chloride.. |
| Ano: 2018 |
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/16139 |
| |
|
|
| Lazzarini, Luiz Eduardo Santos; Pacheco, Fernanda Ventorim; Silva, Samia Torres; Coelho, Adriane Duarte; Medeiros, Ana Paula Ribeiro; Bertolucci, Suzan Kelly Vilela; Pinto, José Eduardo Brasil Pereira; Soares, Joyce Doria Rodrigues. |
| The objective of this study was to demonstrate the effects of the use of LED bulbs in the physiology of cultivated plants. Light-emitting diodes (LEDs) have been proposed as a light source for controlled environments or in plant growth chambers, since they have desirable characteristics for plant development. The development and physiology of plants are strongly influenced by the environment light spectrum provided by the LEDs, among which we can mention the blue, red, green, and their combinations. The blue light, for example, is responsible for a number of important photomorphogenetic features in plants, including stomatal control. Studies indicate that the red wavelength is efficiently absorbed by the pigments present in the plants, since its wavelength... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chlorophyll; Light energy; Light spectrum; Photosynthesis; Pigments.. |
| Ano: 2017 |
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/16972 |
| |
|
|
| Ferlito,Filippo; Allegra,Maria; Torrisi,Biagio; Pappalardo,Helena; Gentile,Alessandra; Malfa,Stefano La; Continella,Alberto; Stagno,Fiorella; Nicolosi,Elisabetta. |
| ABSTRACT: The effect of basal zone defoliation on vines influences yield and ripening depending on the phenological stage and its intensity. Early basal defoliation (EBD) was carried out at flowering on the autochthonous Vitis vinifera (L.) cultivar ‘Nerello mascalese’ grown on the eastern slopes of Mount Etna, Sicily. The effects were evaluated over a two-year period. In the first year, the canopy retained 67 % of its original leaf area after EBD and in the second year, 58 %. Compared with control vines, mid-day leaf water potentials in the EBD vines enjoyed higher water status throughout the growing seasons in both years. EBD had no significant negative effects on yield but did have significant positive effects on the levels of total polyphenols, total... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vitis vinifera (L.); Photosynthesis; Canopy; Sustainability; Berry quality. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000600602 |
| |
|
|
| Jamil,Muhammad; Rehman,Shafiq ur; Lee,Kui Jae; Kim,Jeong Man; Kim,Hyun-Soon; Rha,Eui Shik. |
| When plants are grown under saline conditions, photosynthetic activity decreases leading to reduced plant growth, leaf area, chlorophyll content and chlorophyll fluorescence. Seeds and seedlings of radish (Raphanus sativus L.) were grown in NaCl solutions under controlled greenhouse conditions. The NaCl concentrations in complete nutrient solutions were 0 (control), 4.7, 9.4 and 14.1 dS m-1. The salinity reduced germination percentage and also delayed the germination rate as the salt level increased. Lengths and fresh weights of root and shoot decreased with the increasing salt concentration. Furthermore, photochemical efficiency of PS2 (Fv/Fm), photochemical quenching coefficient (qP), non photochemical quenching coefficient (qN), leaf area and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Raphanus sativus L.; Plant growth; Photosynthesis; Leaf area. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200002 |
| |
|
| |
|
| |
|
|
| Bispo,Wilka Messner da Silva; Araujo,Leonardo; Moreira,Wiler Ribas; Silva,Leandro de Castro; Rodrigues,Fabrício Ávila. |
| ABSTRACT Caused by the vascular fungus Ceratocystis fimbriata, mango wilt is considered to be one of the most serious threats in mango-producing regions worldwide. However, changes in leaf gas exchange level and the mechanisms underlying host responses to this fungal infection remain poorly described. This study aimed to evaluate potential changes in the leaf gas exchange of different mango cultivars (Ubá, Espada, Haden and Tommy Atkins) in response to two Brazilian isolates of C. fimbriata (CEBS15 and MSAK16) to non-invasively assess cultivar variability in relation to the basal level of resistance to mango wilt. Both isolates, regardless of the cultivar, caused reductions in stomatal conductance and, thus, a reduction in CO2 assimilation via diffusive... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mangifera indica; Mango wilt; Photosynthesis; Vascular disease. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200150 |
| |
|
| |
|
|
| Luca,Marcos Javier de; Hungría,Mariangela. |
| Soybean nitrogen (N) demands can be supplied to a large extent via biological nitrogen fixation, but the mechanisms of source/sink regulating photosynthesis/nitrogen fixation in high yielding cultivars and current crop management arrangements need to be investigated. We investigated the modulation of symbiotic nitrogen fixation in soybean [Glycine max (L.) Merrill] at different plant densities. A field trial was performed in southern Brazil with six treatments, including non-inoculated controls without and with N-fertilizer, both at a density of 320,000 plants ha−1, and plants inoculated with Bradyrhizobium elkanii at four densities, ranging from 40,000 to 320,000 plants ha−1. Differences in nodulation, biomass production, N accumulation and partition were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Biological nitrogen fixation; Photosynthesis; Source/sink manipulation; Plant density. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000300002 |
| |
|
|
| Moreira,Wiler Ribas; Bispo,Wilka Messner da Silva; Rios,Jonas Alberto; Debona,Daniel; Nascimento,Clístenes Williams Araújo; Rodrigues,Fabrício Ávila. |
| Brown spot (BS), caused by the fungus Bipolaris oryzae, is one of the most important diseases contracted by rice. We investigated the effect of magnesium (Mg) on the development of BS, caused by Bipolaris oryzae, and the effects of disease development on the photosynthetic performance of rice (Oryza sativa L.) plants (cv. Metica-1) grown in nutrient solutions containing 0.25 or 4.0 mM of Mg. Assessments of BS severity, leaf Mg and pigment concentrations (total chlorophylls and carotenoids), were carried out at 120 h after inoculation, in addition to gas exchange parameters,. Higher leaf concentration of Mg was observed in plants supplied with 4.0 mM Mg than in those supplied with 0.25 mM. The increase in leaf Mg was accompanied by a decrease in BS... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Foliar disease; Macronutrient; Photosynthesis; Plant nutrition. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400328 |
| |
|
|
| Lima Neto,Milton Costa; Martins,Marcio de Oliveira; Ferreira-Silva,Sérgio Luiz; Silveira,Joaquim Albenísio Gomes. |
| Higher plants display different adaptive strategies in photosynthesis to cope with abiotic stress. In this study, photosynthetic mechanisms and water relationships displayed byJatropha curcasL. (physic nuts) andRicinus communisL. (castor bean), in response to variations in environmental conditions, were assessed.R. communis showed higher CO2 assimilation, stomatal and mesophyll conductance thanJ. curcas as light intensity and intercellular CO2 pressure increased. On the other hand,R. communis was less effective in stomatal control in response to adverse environmental factors such as high temperature, water deficit and vapor pressure deficit, indicating lower water use efficiency. Conversely,J. curcas exhibited higher photosynthetic efficiency (gas exchange... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abiotic stress; Castor bean; Photosynthesis; Physic nut; Acclimation. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300260 |
| |
|
| |
|
| |
|
|
| Auntiporn Keansua; Sukumaporn Sriphadet; Jessada Phattaralerphong. |
| A study on changes in net photosynthesis (Pn), transpiration (Tr), stomatal conductance (Gs) and photosynthesis water use efficiency (WUE) of cutted rubber branch c.v. RRIM 600. Four methods included, do not put into the water, immediately put the branch into the water after cut, and put into the water after cut 5 and 10 minutes. The comparing of Pn, Tr, Gs and WUE values before and after cut were done. The result were found that Pn, Tr and Gs decrease immediately after branch was cut. The value decreased rapidly in first 15 minutes. Putting the branch into the water immediately, and putting the brance into the water 5 or and 10 minutes after cut expressed that the Pn, Tr, Gs and WUE could restored to the normal value before the branch was cut.... |
| Tipo: PhysicalObject |
Palavras-chave: Rubber; Cutted rubber branch; RRIM 600; Photosynthesis; Transpiration; Stomatal conductance; Water use efficiency; Plant physiology analysis; ยางพารา; กิ่งยางพารา; การสังเคราะห์ด้วยแสง; การตอบสนองต่อแสง; การเปิดปากใบ; การคายน้ำ; ประสิทธิภาพการใช้น้ำ; การวิเคราะห์สรีรวิทยาของพืช. |
| Ano: 2014 |
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5755 |
| |
|
| |
|
| |
|
| |
| Registros recuperados: 220 | |
|
|
|
