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| Registros recuperados: 117 | |
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| Alyemeni,Mohammed Nasser; Hayat,Shamsul; Wijaya,Leonard; Anaji,Abdullah. |
| Prior to sowing, seeds of Brassica juncea Czern and Coss cv. Varuna were soaked in water (controls) or in 50, 100 or 150 mM of sodium chloride (NaCl) for 6 h. The resulting plants, at 15, 30 and 45 days after sowing (DAS) were either not treated (controls) or were treated with aqueous solutions of the hormone 28-homobrassinolide (HBL), which was applied to their foliage in concentrations of 10-10, 10-8 or 10-6 M. The concentration of NaCl showed an inverse correlation with the activity of nitrate reductase (EC 1.6.6.1), the activity of carbonic anhydrase (EC 4.2.1.1), chlorophyll content at 60 DAS, the rate of photosynthesis at 60 DAS, and seed yield at 140 DAS (at harvest), all of which decreased in parallel with increases in NaCl concentration. However,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carbonic anhydrase; Chlorophyll; Homobrassinolide; Nitrate reductase; Seed yield. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000300007 |
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| Renner,Gladys Daniela Rogge; Randi,Áurea Maria. |
| It is an endangered tree fern that grows in mixed umbrophylus forests in the tropics. Sterilized spores were germinated at 25 ± 2ºC under a 16-hour photoperiod, in Dyer and MS medium supplemented with 0 to 5% sucrose. The germination was lower with the addition of sucrose. Dry mass was higher in 30-day-old gametophytes cultivated in Dyer medium with the addition of 3 to 5% of sucrose. The dry mass decreased in 30-day-old gametophytes cultivated in Dyer and MS media without sucrose and in MS medium with the addition of 4 or 5% of sucrose. The effect of different irradiance on the germination and early gametophyte development of D. sellowiana was analyzed in the autumn of 1998 (May until July). Conical flasks containing spores were kept over a period of 49... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sugar; Chlorophyll; Gametophyte; Germination; Irradiance. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062004000200017 |
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| Becker, Fernanda Salamoni; Vilas Boas, Ana Carolina; Sales, Adones; Tavares, Lucas Silveira; Siqueira, Heloisa Helena de; Vilas Boas, Eduardo Valério de Barros. |
| This work aimed to evaluate the physicochemical characteristics and enzymatic activity of “Sabará” jabuticaba fruits, which were cultivated in Lavras, Minas Gerais State, Brazil, at different maturation stages. The fruits were harvested and separated into five different stages: totally green fruit, fruit with incipient pigmentation, fruit with a light purple predominance, totally purple fruit and totally dark purple fruit. These fruits were physicochemically analyzed and evaluated for polygalacturonase enzymatic activity. Chlorophyll degradation and the synthesis of anthocyanin on fruit rinds were observed, as well as the degradation of the cell wall and its consequent softening. In the pulp, increased soluble solids, pH and sugars were observed, while... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 50700006 CIÊNCIA E TECNOLOGIA DE ALIMENTOS 50701045 FISIOLOGIA PÓS-COLHEITA Myrciaria jaboticaba; Pectin; Polygalacturonase; Chlorophyll; Anthocyanin. FISIOLOGIA PÓS-COLHEITA. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19499 |
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| Dias, Bruna Borba; Universidade Federal de Santa Catarina; Leite, Maysa de Lima; Universidade Estadual de Ponta Grossa, Paraná; Farago, Paulo Vitor; Universidade Estadual de Ponta Grossa, Paraná; Oliveira, André Vicente de; Universidade Estadual de Ponta Grossa, Paraná; Beruski, Gustavo Castilho; Universidade Estadual de Ponta Grossa, Paraná. |
| O presente trabalho teve o objetivo de analisar os efeitos do enxofre e da chuva ácida simulada sobre a estrutura foliar do feijoeiro (Phaseolus vulgaris L), nos aspectos morfoanatômicos, teores de clorofila a, b, total e feofitina. As plantas-controle sofreram simulações de chuva com pH 6,0 e as plantas-teste sofreram simulação de chuva ácida com pH 3,0. As concentrações de clorofila a, b e total diminuíram no estádio de floração (R6). Já, no estádio R7, onde surgem as primeiras vagens, os teores aumentaram, indicando possível resistência e/ou adaptação dos espécimes às simulações ácidas. O tratamento ácido afetou a concentração de clorofila que foi degradada por processos oxidativos sem a sua conversão em feofitina. Também se observou diminuição na... |
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Palavras-chave: 5.00.00.00-4; 5.01.03.06-7; Phaseolus vulgaris; Chuva ácida; Enxofre; Clorofila; Anexos epidérmicos Ciências Agrárias e Fisiologia de Plantas Cultivadas Phaseolus vulgaris; Acid rain; Sulfur; Chlorophyll; Epidermal annexes. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/4273 |
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| Brito, Giovani Greigh; Empresa Brasileira de Pesquisa Agropecuária; Sofiatti, Valdinei; Empresa Brasileira de Pesquisa Agropecuária; Brandão, Ziany Neiva; Empresa Brasileira de Pesquisa Agropecuária; Silva, Vivianny Belo; Empresa Brasileira de Pesquisa Agropecuária; Silva, Franklin Magnum; Empresa Brasileira de Pesquisa Agropecuária; Silva, Dalva Almeida; Empresa Brasileira de Pesquisa Agropecuária. |
| Analytical techniques used to extract chlorophyll from plant leaves are destructive and based on the use of organic solvents. This study proposes a non-destructive quantification of the photosynthetic pigment concentration in cotton leaves using two portable chlorophyll meters, the SPAD-502 and the CLOROFILOG 1030. After obtaining 200 leaf discs, each with an area of 113 mm2, the greening rate in each disc was determined by the average of five readings from both meters. Immediately after measurement, 5 mL of dimethyl sulfoxide (DMSO) was added, and the samples were kept in a water bath at 70ºC for 30 min. After cooling, 3 mL of the liquid extract was used for analyses by spectrophotometry at 470, 646 and 663 nm. Mathematical models were adjusted from... |
| Tipo: Pesquisa Empirica de Campo |
Palavras-chave: Fisiologia de plantas cultivadas Gossypium hirsutum; Chlorophyll; Carotenoids; Cotton 5.01.03.06-7 Gossypium hirsutum; Chlorophyll; Carotenoids; Cotton. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/10926 |
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| Silva, Dayane Meireles da; Fonte, Nathalia dos Santos da; Souza, Kamila Rezende Dázio de; Rodrigues-Brandão, Isabel; Libeck, Ian Teodoro; Alves, Jose Donizeti. |
| The objective of this study was to evaluate the relationship between excess manganese and waterlogging tolerance in 18th selection cycle Zea mays L. cv. Saracura plants. Maize plants were transferred to plastic receptacles containing solutions with different concentrations of manganese. Leaves and roots were evaluated at the beginning of treatment and after 7, 14, and 21 days for chlorophyll content, biomass production and antioxidant metabolism. Mn was strongly translocated from the roots to the leaves, triggering a decrease in chlorophyll content. Excess Mn promoted an increase in reactive oxygen species that was accompanied by higher levels of antioxidative enzyme activity and lipid peroxidation. Zea mays L. cv. Saracura efficiently sequestered... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.03.03.00-9 hypoxia; Chlorophyll; Oxidative stress Fisiologia Vegetal. |
| Ano: 2017 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30997 |
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| Maranhão, Camila Maida de Albuquerque; UESB; Silva, Cristina Cavalcante Felix da; UESB; Bonomo, Paulo; UESB; Pires, Aureliano José Vieira; UESB. |
| O estudo foi conduzido com o objetivo de se avaliar a produção de matéria seca da parte aérea (PMSA) e da raiz (PMSR), a composição bromatológica, o teor de clorofila (valor SPAD), assim como se realizar uma análise de correlação entre o teor de clorofila (índice SPAD) e o teor de nitrogênio na planta e produção de matéria seca da parte aérea de duas cultivares de braquiária. O ensaio foi conduzido em esquema fatorial 4 x 2, sendo quatro doses de N (0, 75, 150 e 225 mg dm-3 de N) e duas cultivares de braquiária (Brachiaria brizantha cv. Marandu e Brachiaria decumbens cv. Basilisk) dispostos no delineamento em blocos casualizados com cinco repetições. A PMSA foi incrementada com o aumento das doses de N, enquanto que com a PMSR aconteceu o inverso,... |
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Palavras-chave: Brachiaria brizantha; Bachiaria decumbens; Clorofila; Raíz Brachiaria brizantha; Bachiaria decumbens; Chlorophyll; Roots. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/4305 |
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| Mendes, Cristina Rodrigues; UFSM; Lima, Maria da Graça de Souza; UFPel; Quadros, Fernando Luiz Ferreira de; UFSM; Abreu, Claudete Miranda; FURG; Garagorry, Fábio Cervo; UFSM. |
| A importância do fogo na origem e na manutenção das áreas de pastagens é bastante discutida. O objetivo foi verificar a influência da queima no teor de pigmentos fotossintéticos, proteína solúvel e carboidratos em gramíneas nativas de pastagem sob pastoreio rotacionado. Foram avaliadas as lâminas foliares de oito gramíneas, de pastagem natural, representantes de quatro grupos funcionais. Foram quantificados teores de pigmentos, proteínas solúveis, carboidratos solúveis, amido e açúcares redutores. A maioria das espécies sem queima teve maior teor de pigmentos. De modo geral, não houve efeito do fogo sobre a proteína solúvel, porém as espécies D. sabulorum, A. affinis e A. laevis se destacaram como o grupo de maior teor proteico solúvel dentre as espécies... |
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Palavras-chave: Carotenóide; Clorofila; Fotossíntese; Fogo; Grupos funcionais Carotenoid; Chlorophyll; Photosynthesis; Fire; Functional groups. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/8400 |
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| Cabello-Pasini,Alejandro; Macías-Carranza,Víctor. |
| Leaf absorptance (A), transmittance (T) and reflectance (R) of visible solar radiation strongly correlate with chlorophyll concentration in a number of plant species, however, little is known about the optical properties of grapevine leaves. Consequently, the objective of this study was to evaluate the optical properties of intact leaves for estimating chlorophyll concentration in Cabernet Sauvignon, Merlot and Tempranillo vaieties. Leaves from Cabernet Sauvignon, Merlot and Tempranillo vines were collected at San Antonio de las Minas, Baja California, México, in 2009, and A, T and R determined with a spectroradiometer. While leaf age played a significant role on the leaf chlorophyll concentration, the chlorophyll a+b concentration vs. R, T and A... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Absorptance; Chlorophyll; Reflectance; Transmittance; Optical properties. |
| Ano: 2011 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952011000800007 |
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| BÜNDCHEN,MÁRCIA; BOEGER,MARIA REGINA T.; REISSMANN,CARLOS B.; GERONAZZO,KELLY M.. |
| ABSTRACT The purpose of this study was to analyze the seasonal variation in the nutrient and pigment content of leaves from five tree species - of which three are perennial (Cupania vernalis, Matayba elaeagnoides and Nectandra lanceolata) and two are deciduous (Cedrela fissilis and Jacaranda micrantha) - in an ecotone between a Deciduous Seasonal Forest and a Mixed Ombrophilous Forest in the state of Santa Catarina, Brazil. Leaf samples were collected in the four seasons of the year to determine the content of macronutrients (N, K, P, Mg, Ca, S) and photosynthetic pigments (Chla, Chlb, Chltot, Cartot, Chla:Chlb and Cartot:Chltot). The principal component analysis showed that leaf pigments contributed to the formation of the first axis, which explains most... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chlorophyll; Araucaria forest; Deciduous Forest; Macronutrients. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200467 |
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| ALVARENGA,IVAN C.A.; PACHECO,FERNANDA V.; ALVARENGA,AMAURI A.; BERTOLUCCI,SUZAN K.V.; PINTO,JOSÉ EDUARDO B.P.. |
| Abstract Yarrow (Achillea millefolium L., Asteraceae) is an important medicinal plant used worldwide for its medicinal properties such as the analgesic, antioxidant and anti-inflammatory ones. The aim of this study was to evaluate the growth and production of photosynthetic pigments and of volatile constituents of Achillea millefolium L. under different irrigation depths. The treatments were the application of 55, 110, 220, 440 and 880 mm of water for a period of 110 days. Data were submitted to polynomial regression analysis at 5% probability, while the volatile constituents were analyzed by standard deviation. Different irrigation depths provided quadratic growth responses being the highest dry matter production at the depth of 440 mm. The contents of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water stress; 1; 8 cineol; Chlorophyll; Terpenes. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703901 |
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| SHEYKHBAGLOU,ROGHAYYEH; SEDGHI,MOHAMMAD; FATHI-ACHACHLOUIE,BAHRAM. |
| ABSTRACT Soybean (Glycine max L.) seed contains amounts of protein, lipid, carbohydrate and mineral elements, which protein and lipid have been known as a main part for soybean’s trade value. In this study, in order to investigate the effect of ferrous nano-oxide particles on nutritional compounds of soybean seed, an experiment with 5 treatments and 3 replications was conducted as a randomized complete block design. Treatments were 5 concentrations of ferrous nano-oxide particles including 0, 0.25, 0.5, 0.75 and 1 g L-1 which were sprayed 3 times at 4 and 8 leaves stage and pod initiation. Lipid and protein contents, fatty acids profile, some of mineral elements such as Fe, Mg, Ca and P, chlorophyll a, b and total chlorophyll content were determined.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soybean; Ferrous nano-oxide; Nutritional compounds of soybean seed; Fatty acids profile; Chlorophyll. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100485 |
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| Muradoglu,Ferhad; Gundogdu,Muttalip; Ercisli,Sezai; Encu,Tarik; Balta,Fikri; Jaafar,Hawa ZE; Zia-Ul-Haq,Muhammad. |
| BACKGROUND: Cadmium (Cd) is well known as one of the most toxic metals affecting the environment and can severely restrict plant growth and development. In this study, Cd toxicities were studied in strawberry cv. Camarosa using pot experiment. Chlorophyll and malondialdehyde (MDA) contents, catalase (CAT), superoxide dismutase (SOD), ascorbate peroxidase (APX) activities and mineral nutrient concentrations were investigated in both roots and leaves of strawberry plant after exposure Cd. RESULTS: Cd content in both roots and leaves was increased with the application of increasing concentrations of Cd. We found higher Cd concentration in roots rather than in leaves. Chlorophyll a and b was decreased in leaves but MDA significantly increased under increased... |
| Tipo: Journal article |
Palavras-chave: Antioxidant enzymes; Cadmium; Chlorophyll; Heavy metal stress; Strawberry. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100011 |
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| Todeschini,Matheus Henrique; Milioli,Anderson Simionato; Trevizan,Diego Maciel; Bornhofen,Elesandro; Finatto,Taciane; Storck,Lindolfo; Benin,Giovani. |
| ABSTRACT The nitrogen use efficiency (NUE) is defined as the capacity of a given genotype in take advantage of the applied nitrogen (N) and transform it in biomass and grains. The objective of this study was to evaluate 12 wheat cultivars as to the NUE and its components. The experiment was conducted in a controlled environment, in a randomized block design with three replications. Twelve wheat cultivars were submitted to four N supply levels (0, 80, 160 and 240 kg of N∙ha–1). The data were submitted to analysis of variance, means multiple comparison, polynomial regression, and path analysis. The nitrogen remobilization efficiency (NRE) was the main NUE component of the evaluated cultivars, in both low and high conditions of nitrogen fertilization. In the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triticum aestivum; Nitrogen nutrition; Path analysis; Chlorophyll; Yield. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000300351 |
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| Hasbullah,Nor Azlina; Taha,Rosna Mat; Saleh,Azani; Mohamed,Normadiha. |
| In the present study, in vitro mutagenesis techniques were applied to investigate the effects of gamma irradiation at 0, 10, 20, 30, 40, 50 and 60 Gy on physiological changes in callus of Gerbera jamesonii Bolus ex. Hook f. Biochemical changes in chlorophyll and soluble protein content of pre- and post- irradiated Gerbera callus were studied. Non-irradiated callus demonstrated the highest amount of chlorophyll content as compared to callus irradiated at 10, 20, 30, 40, 50 and 60 Gy. In addition, the amount of chlorophyll b was relatively higher than chlorophyll a in both the irradiated and non-irradiated callus, except for callus irradiated at 10 Gy. Biochemical differentiation based on total soluble protein content revealed gradual reduction after day 9... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gerbera jamesonii; Gamma irradiation; Callus; In vitro; Chlorophyll; Soluble protein. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000300012 |
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| Silva,Marcelo de Almeida; Jifon,John Lonfover; Santos,Claudiana Moura dos; Jadoski,Cleber Junior; Silva,Jorge Alberto Gonçalves da. |
| The objective of this study was to compare the gas exchange, photosynthetic capacity and water potential of sugarcane genotypes cultivated under water deficit conditions imposed during the initial growth phase. Experiments were performed in a greenhouse using two sugarcane genotypes namely: HoCP93-776 (drought susceptible) and TCP02-4587 (drought tolerant). Sixty days after planting, two different water treatments were applied (i.e., with or without water deficit). At 0,30 and 60 days after the treatment, gas exchange variables were evaluated for their relationship with water use, intrinsic instantaneous water use efficiency and instantaneous carboxylation efficiency. The SPAD index, photosynthetic pigments, water potential and relative water content in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp.; Photosynthesis; Stomatal conductance; Chlorophyll; Drought tolerance; Water potential. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000500004 |
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| Dias,Jaqueline; Pimenta,José Antonio; Medri,Moacyr Eurípedes; Boeger,Maria Regina Torres; Freitas,Claudinei Toledo de. |
| The aim of this work was to compare the physiological parameters of sun and shade leaves of a specimen of L. molleoides. The higher-positional leaves, classified as sun leaves, presented similar photosynthetic rate, lower chlorophyill contents (a, b and total), same a chlorophyll /b chlrorophyll rate, lower transpiratory rate, same stomatal conductance and intercellular concentration of CO2 as the lower-positional leaves, classified as shade leaves. Nutrient concentration, except for Ca and Mg, was the same for both sun and shade leaves.The physiological parameter responses indicated that although receiving lower light intensity, the shade leaves had the same capacity to grow and develop as the sun leaves. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Photosynthesis; Sun leaves; Shade leaves; Light intensity; Chlorophyll; Lithraea molleoides. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000100011 |
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| Haddad,Claudia R. B.; Mazzafera,Paulo. |
| Leaf senescence induced by sodium chloride was studied in Hydrocotyle bonariensis Lam. and Foeniculum vulgare L. Both species belong to Umbelliferae family, however only H. bonariensis grows spontaneously in sandy soils of coastal regions (saline soils). Leaves of plants receiving nutrient solutions containing different concentrations of NaCl were evaluated for fresh and dry weights and chlorophyll content. The denaturating electrophoretic profiles of leaf proteins were also studied. Sodium chloride changed the protein profile of F. vulgare and hastened the leaf senescence of both the species. However, plants of H. bonariensis receiving 599 mM NaCl lasted longer than F. vulgare. Therefore, the occurrence of H. bonariensis in saline soils might be related... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chlorophyll; Protein; Salinity; Senescence. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000200005 |
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| Registros recuperados: 117 | |
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