oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Response of Crotalaria juncea to nickel exposure
Cardoso, Patrícia Felippe;Grat?o, Priscila Lupino;Gomes-Junior, Rui Alberto;Medici, Leonardo Oliveira;Azevedo, Ricardo Antunes;
Brazilian Journal of Plant Physiology , 2005, DOI: 10.1590/S1677-04202005000200010
Abstract: the response of crotalaria juncea seedlings to nickel (ni) was investigated. ni was shown to accumulate mainly in the root system, with little being translocated to the shoots. catalase (cat) and glutathione reductase (gr) responses to ni were also analyzed. cat activity did not exhibit a clear trend in response to ni exposure, whereas gr activity appeared to respond to the stress induced by ni. the results suggest that in c. juncea gr participates in the detoxification of ni-induced reactive oxygen species via the glutathione-ascorbate cycle.
Growth of Crotalaria juncea L. supplied with mineral nitrogen
Mendon?a, Elenira Henrique Miranda;Schiavinato, Marlene Aparecida;
Brazilian Archives of Biology and Technology , 2005, DOI: 10.1590/S1516-89132005000200003
Abstract: plants of crotalaria juncea inoculated with rhizobium were treated with nutrient solution containing 10 or 20mg of either n/no3 or n/nh4.plant-1.week-1 . the control plants received nutrient solution without n. an investigation was conducted on the effect of these sources of n on growth and nitrogen fixation of plants with 30, 60 and 90 days after sowing (das). those that received mineral n presented higher growth than -n plants, but the presence of nodules occurred in all the treatments. plants treated with nh4 presented higher n content until 60 days. the highest concentrations of leghemoglobin and protein in nodules were found at 30 das and there was no difference in leghemoglobin content between treatments for any age and in protein from 60 das. nitrogenase activity did not vary from 60 to 90 days, with the exception of plants that received 20mg n/no3, where it was higher at 60 days
Nitrogen-15 labeling of Crotalaria juncea green manure
Ambrosano, Edmilson José;Trivelin, Paulo Cesar Ocheuze;Cantarella, Heitor;Rossetto, Raffaella;Muraoka, Takashi;Bendassolli, José Albertino;Ambrosano, Gláucia Maria Bovi;Tamiso, Luciano Grassi;Vieira, Felipe de Campos;Prada Neto, Ithamar;
Scientia Agricola , 2003, DOI: 10.1590/S0103-90162003000100027
Abstract: most studies dealing with the utilization of 15n labeled plant material do not present details about the labeling technique. this is especially relevant for legume species since biological nitrogen fixation difficults plant enrichment. a technique was developed for labeling leguminous plant tissue with 15n to obtain labeled material for nitrogen dynamics studies. sun hemp (crotalaria juncea l.) was grown on a paleudalf, under field conditions. an amount of 58.32 g of urea with 70.57 ± 0.04 atom % 15n was sprayed three times on plants grown on eight 6-m2-plots. the labelled material presented 2.412 atom % 15n in a total dry matter equivalent to 9 mg ha-1 this degree of enrichment enables the use of the green manure in pot or field experiments requiring 15n-labeled material.
Chrysoperla externa (Neuroptera: Chrysopidae) and Utetheisa ornatrix (Lepidoptera: Arctiidae) on organically grown Crotalaria juncea (Fabaceae) Chrysoperla externa (Neuroptera: Chrysopidae) e Utetheisa ornatrix (Lepidoptera: Arctiidae) sobre Crotalaria juncea (Fabaceae) cultivada organicamente  [cached]
M.A. Costa,W.S. Tavares,A.I.A. Pereira,I. Cruz
Planta Daninha , 2012, DOI: 10.1590/s0100-83582012000300001
Abstract: Chrysoperla externa (Neuroptera: Chrysopidae) larvae can avoid foraging on plants of Crotalaria juncea (Fabaceae) after the issuance of floral buds, when the prey of Utetheisa ornatrix (Lepidoptera: Arctiidae) incorporate toxic pyrrolizidine alkaloids from this plant. This reduces the predation and favors increasing the number of adults and eggs of this defoliator on crops of this plant. The aim of the present paper was to evaluate some biological and ecological aspects of C. externa and U. ornatrix on the organic crop of C. juncea in the EMBRAPA Maize and Sorghum in Sete Lagoas, Minas Gerais State, Brazil. Chrysoperla externa and U. ornatrix were more abundant in the vegetative and flowering stages of C. juncea, respectively, with caterpillars of this defoliator feeding on leaves and seeds of this plant. The duration of the stages/instars, survival, lifetime fecundity, and oviposition showed that the branches of C. juncea are a suitable food for U. ornatrix. The abundance of adults and larvae of C. externa was lower in the flowering and pods stages of C. juncea, respectively, when the postures of U. ornatrix are present, probably due to the toxicity of the eggs of this prey to this predator. During these stages, C. externa may be reared with alternative hosts, and when the crops of C. juncea are scarce, an artificial diet should be used for rearing this defoliator in the laboratory for biological research and the development of biological control tactics. Larvas de Chrysoperla externa (Neuroptera: Chrysopidae) podem evitar o forrageamento sobre plantas de Crotalaria juncea (Fabaceae) após a emiss o de bot es florais, quando presas de Utetheisa ornatrix (Lepidoptera: Arctiidae) incorporam alcalóides pirrolizidínicos tóxicos dessa planta. Isso reduz a preda o e favorece o aumento do número de adultos e ovos desse desfolhador sobre cultivos dessa planta. O objetivo deste trabalho foi avaliar alguns aspectos biológicos e ecológicos de C. externa e U. ornatrix sobre cultivo organico de C. juncea na EMBRAPA Milho e Sorgo, em Sete Lagoas, Minas Gerais, Brasil. Chrysoperla externa e U. ornatrix foram mais abundantes nos estádios vegetativo e de florescimento de C. juncea, respectivamente, com lagartas desse desfolhador se alimentando sobre folhas e sementes dessa planta. A dura o dos estágios/estádios, sobrevivência, fecundidade de vida e oviposi o mostraram que ramos de C. juncea é um alimento adequado para U. ornatrix. A abundancia de adultos e larvas de C. externa foi menor nas fases de flora o e vagens de C. juncea, respectivamente, quando posturas de
Sulfur utilization by rice and Crotalaria juncea from sulfate - 34S applied to the soil  [cached]
Trivelin Paulo Cesar Ocheuze,Bendassolli José Albertino,Muraoka Takashi,Carneiro Jr. Francisco
Scientia Agricola , 2002,
Abstract: In tropical soils with intensive agriculture an increasing sulfur deficiency has been verified in several crops. The low available S in these soils is caused by the continuous use of concentrated NPK fertilizers. The objective of this work was to evaluate the utilization by rice (Oriza sativa L.) and crotalaria juncea (Crotalaria juncea L.) of sulfur applied to the soil, under greenhouse conditions. Pots with 3 kg of an Argisol (Paleudalf) were used to test the isotopic technique with the stable isotope 34S, adding a solution of sodium sulfate labeled with 34S (14.30 ± 0.05 atom % of 34S) to the soil (70 mg SO4-S per kg-1 of soil) 18 days after sowing both species. The shoots of the crotalaria and rice were harvested, respectively on the 72nd and 122nd days after S fertilization. The concentration and the amount of sulfur in the crotalaria were higher than in rice, due to the higher legume requirement for this nutrient. The sulfur requirement and the short time interval between fertilization and harvest of the crotalaria resulted in a small amount of native SO4-S mineralized in the soil and a small quantity of 34SO4 immobilized by soil microorganisms. Thus, the percentage of sulfur in the crotalaria derived from the fertilizer (Sdff) was higher than in the rice (%Sdff crotalaria = 91.3 ± 3.5%; %Sdff rice = 66.3 ± 0.8%). The expressive values of %Sdff indicate a low rate of mineralization of SO4-S probably as a consequence of the low available sulfur content in the soil.
Sulfur utilization by rice and Crotalaria juncea from sulfate - 34S applied to the soil
Trivelin, Paulo Cesar Ocheuze;Bendassolli, José Albertino;Muraoka, Takashi;Carneiro Jr., Francisco;
Scientia Agricola , 2002, DOI: 10.1590/S0103-90162002000100030
Abstract: in tropical soils with intensive agriculture an increasing sulfur deficiency has been verified in several crops. the low available s in these soils is caused by the continuous use of concentrated npk fertilizers. the objective of this work was to evaluate the utilization by rice (oriza sativa l.) and crotalaria juncea (crotalaria juncea l.) of sulfur applied to the soil, under greenhouse conditions. pots with 3 kg of an argisol (paleudalf) were used to test the isotopic technique with the stable isotope 34s, adding a solution of sodium sulfate labeled with 34s (14.30 ± 0.05 atom % of 34s) to the soil (70 mg so4-s per kg-1 of soil) 18 days after sowing both species. the shoots of the crotalaria and rice were harvested, respectively on the 72nd and 122nd days after s fertilization. the concentration and the amount of sulfur in the crotalaria were higher than in rice, due to the higher legume requirement for this nutrient. the sulfur requirement and the short time interval between fertilization and harvest of the crotalaria resulted in a small amount of native so4-s mineralized in the soil and a small quantity of 34so4 immobilized by soil microorganisms. thus, the percentage of sulfur in the crotalaria derived from the fertilizer (sdff) was higher than in the rice (%sdffcrotalaria = 91.3 ± 3.5%; %sdffrice = 66.3 ± 0.8%). the expressive values of %sdff indicate a low rate of mineralization of so4-s probably as a consequence of the low available sulfur content in the soil.
EVALUACIóN DE LA ACTIVIDAD BIOLóGICA DE EXTRACTOS DE Crotalaria Juncea MEDIANTE EL MODELO Drosophila melanogaster EVALUATION OF BIOLOGICAL ACTIVITY OF Crotalaria Juncea EXTRACTS THROUGH A Drosophila melanogaster MODEL  [cached]
Giann C PE?ALOZA A,Carlos A PELáEZ J
Vitae , 2008,
Abstract: El crecimiento desmesurado de la población mundial ha presionado a la búsqueda de métodos para el control de plagas, de modo tal que sea posible una producción racional y sostenida de alimentos, y adicionalmente, se garantice la conservación de los ecosistemas. Con el modelo biológico Drosophila melanogaster es posible evaluar la actividad de extractos de diferente polaridad obtenidos a partir de Crotalaria juncea (Fabaceae). El modelo facilita la identificación y purificación de las fracciones activas, y permite establecer que dichos extractos ejercen dos tipos de actividad inhibitoria sobre su ciclo de vida. La primera,se manifiesta con la disminución del número de adultos en los tratamientos frente al control; y la segunda, causa la inhibición de los estadios larvarios del modelo, lo cual se manifiesta en una disminución en el número de pupas. Con el uso de ensayos biodirigidos y de técnicas espectroscópicas de resonancia magnética nuclear (RMN), se establece la estructura de un principio activo que causa los dos tipos de inhibición sobre el modelo, un alcaloide pirrolizidínico del tipo retronécico, conocido como Junceína. El uso del modelo biológico como herramienta analítica cuantitativa, permite establecer la correlación de las variables dosis y respuesta. The disproportionate growth of world population has led the search methods to control pests that permit a rational and sustained production of food, which additionally ensure the conservation of ecosystems. The activity of extracts with different polarity obtained from C. juncea was evaluated using the biological model of Drosophila melanogaster. This model allows the identification and purification of active fractions, and allows establishing that these extracts exert two different inhibitory activities over the life cycle of Drosophila melanogaster. The first activity showed the reduction in the number of adults compared with the control group. The second activity caused the inhibition of the larval estate then it resulted in diminution of the pupal number. The use of the biological assay and spectroscopy techniques as Nuclear Magnetic Resonance, allowed the establishment that the structure of active principle of Crotalaria juncea is in agreement with a pyrrolizidinic alkaloid of retronecic type well known as Junceine. The use of biological model as quantitative analytical tool, allows the establishment of correlation between dosage and response variables.
Fontes e níveis de salinidade na germina??o de sementes de Crotalaria juncea L.
Nunes, Anísio da Silva;Louren??o, André Luís Faleiros;Pezarico, Carmen Regina;Scalon, Silvana de Paula Quint?o;Gon?alves, Manoel Carlos;
Ciência e Agrotecnologia , 2009, DOI: 10.1590/S1413-70542009000300013
Abstract: this study was carried out in order to evaluate the effect of calcium chloride (cacl2), sodium chloride (nacl), and potassium chloride (kcl) salts on germination of crotalaria juncea l. seeds. the seeds were placed in gerbox boxes lined with two filter paper sheets and wet with test-solution. in each treatment, 200 seeds were used, distributed in four replicates of 50 seeds. the induction of the salt stress was done with solutions of nacl, cacl2 and kcl with osmotic potential of 0, -0.4, -0.8, -1.2, -1.6, and -2.0 mpa. germination percentage, phytotoxicity, seedling size, mass of dry matter, and ivg were assessed. the experimental design was completely randomized, in a (3x5)+1 factorial structure, composed of three salt sources in five levels and a test-solution. the increasing concentration of kcl caused toxicity, hindering the ivg, the germination percentage. and the seedling growth of c. juncea, while the concentrations of nacl and cacl2 did not cause significant difference in seed germination and seedling vigor.
A STUDY ON THE ANTITUMOUR COMPONENT OF CROT ALARIA JUNCEA L.
菽麻(Crotalaria juncea L.)抗肿瘤化学成份的研究

Wang Huiru,Li Xinming,Yan Guangqiong,Shang Tinglan,
王会儒
,李新明,严光琼,尚廷兰

植物科学学报 , 1983,
Abstract: 我们从菽麻(Crotalaria juncea L.)种子中提取、分离出菽麻生物碱Ⅰ,对多种动物瘤谱具有较明显的抑制作用。并且对生物碱Ⅰ进行了熔点、旋光、红外光谱、核磁共振谱、质谱等理化测定,均与Trichodesmine性状一致。
Influência do diametro na densidade básica dos caules de crotalaria juncea e quenafe (Hibiscus cannabinus)
Azzini, Anísio;Zimback, Léo;Salgado, Antonio Luiz de Barbos;
Bragantia , 1982, DOI: 10.1590/S0006-87051982000100017
Abstract: the basic density of sunn hemp (crotalaria juncea) and kenaf (hibiscus cannabinus) stalks were determined by the maximum moisture content method and water displacement method. the density of the solid substance of sunn hemp and kenaf stalks was also determined. the results showed a direct relationship between diameter of the stalks and basic density. the density of the solid substance of sunn hemp and kenaf stalks was similar to the density of wood substance.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.