Consulta: subjectFacets:"Nitrogenase"
Registros recuperados: 7
Data/hora: 09/06/2024 13:47:38

Effect of water stress on nitrogen fixation and nodule structure of common bean
Provedor de dados: 86
Autores: 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

Efeito do boro na nodulação da ervilha cultivada em solos de várzea
Provedor de dados: 86
Autores: Azevedo,Watson Rogério de; Faquin,Valdemar; Moreira,Fátima Maria de Souza; Oliveira Júnior,Antônio Claret de; Lisboa,Carolina Cardoso.
O objetivo deste trabalho foi avaliar o efeito do boro na nodulação da ervilha (Pisum sativum L. cv. Torta de Flor Roxa), cultivada em solos de várzea em condições de casa de vegetação, entre maio e julho de 1998. Amostras de Neossolo Flúvico, Gleissolo Háplico, Gleissolo Melânico e Organossolo Mésico artificialmente drenado foram coletadas na camada de 0-20 cm. Essas amostras foram previamente cultivadas com rabanete, e receberam calcário, P, K, S, Cu e Zn e seis doses de B (0,0, 0,25, 0,5, 1,5, 3,0 e 6,0 mg dm-3). Por ocasião do cultivo da ervilha aplicou-se apenas K (100 mg dm-3). O delineamento experimental foi inteiramente casualizado, em esquema fatorial 4x6, com três repetições. Foram cultivadas três plantas por vaso, cujas sementes, na época da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inoculação; Rhizobium leguminosarum; Simbiose; Nitrogenase.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002000800011

Efeito do fósforo na captação de minerais e pigmentação de Azolla caroliniana Willd. (Azollaceae)
Provedor de dados: 88
Autores: Adalberto,Paulo R.; Massabni,Antonio C.; Goulart,Antonio J.; Monti,Rubens; Lacava,Pedro M.
O bioacúmulo de minerais, a fixação de nitrogênio e a concentração de pigmentos em Azolla caroliniana foram estabelecidos sob estresse nutritivo. As culturas foram mantidas em frascos de poliestireno, utilizando gradiente de fosfato entre 10-7 e 10-3 mol.L-1. Os minerais (P, S, B e Sn) foram quantificados por espectrometria de emissão ótica com plasma de acoplamento induzido e o teor de nitrogênio pelo método de Kjeldahl. A atividade da nitrogenase foi determinada pela reação de redução do acetileno e as concentrações de pigmentos foram determinadas por fotometria nos extratos metanólicos acidificados. A absorção de macronutrientes (N, P, S) mostrou-se relacionada ao suprimento de fósforo, enquanto a absorção de micronutrientes (B e Sn) não sofreu este...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antocianina; Azolla caroliniana; Bioacumulação de minerais; Nitrogenase.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000300017

Glutamine synthetase and glutamate synthase activities in relation to nitrogen fixation in Lotus spp.
Provedor de dados: 93
Autores: GONNET,SUSANA; DÍAZ,PEDRO.
Lotus corniculatus, L. tenuis, L. pedunculatus, and L. subbiflorus inoculated with Mesorhizobium loti NZP2037 strain were grown in a growth chamber. The plants dry weight (DW), the nodule fresh weight (FW), the nitrogenase activity, the nodule glutamine synthetase (GS) and glutamate synthase (GOGAT) activities, as well as the leghemoglobin content and the amino acid in the stem were measured 28 days after inoculation. The highest DW of plants was measured in L. tenuis and the highest FW of nodules was measured in L. pedunculatus. Nitrogenase activity in L. tenuis, L. pedunculatus and L. subbiflorus was six fold the activity in L. corniculatus. Nodule GS and GOGAT activities did not follow this same pattern. L. tenuis had the highest values of GS and GOGAT...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fixation; Nitrogenase; Mesorhizobium loti; Leghemoglobin; Ammonia assimilation.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-31312000000300003

การศึกษาความสัมพันธ์ระหว่างฟอสฟอรัสและกิจกรรมของเอนไซม์ไนโตรจีเนสของเชื้ออะโซสไปริลลัมในข้าวโพดพันธุ์สุวรรณ 5
Provedor de dados: 106
Autores: Sirinapa Chungopast; Thongchai Mala; Jirawat Phumphet; Wantanee Phungsang.
Phosphorus is one of essential nutrient element not only for plant growth but also for enhancing soil microorganisms. Phosphorus currently has been attributed to influence nitrogenase activity of nitrogen fixing microorganisms. This experiment aimed to study the interaction between phosphorus and nitrogenase activity of Azospirillum. The P sources came from soil, rock phosphate and activity of Bacillus megaterium. CRD with 4 replications, using Suwan 5 maize as the test plant, was carried in 2 experiments. The first experiment consisted 9 treatments and was conducted in laboratory, while the second experiment, consisted 8 treatments, was done in green house. The result showed significant nitrogenase activity in week 4 of incubation. The activity tended to...
Palavras-chave: Maize; Nitrogenase; Phosphorus; Azospirillum; Suwan 5 maize; ข้าวโพด; อะโซสไปริลลัม; หินฟอสเฟต; ฟอสฟอรัส; ไนโตรจีเนส; กิจกรรมของเอนไซม์; พันธุ์สุวรรณ 5.
Ano: 2010
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4672

COMPOSITION AND FUNCTION OF THE MICROBIAL COMMUNITY RELATED WITH THE NITROGEN CYCLING ON THE POTATO RHIZOSPHERE
Provedor de dados: 37
Autores: FLÓREZ-ZAPATA,NATHALIA; GARCÍA,JUAN CARLOS; DEL PORTILLO,PATRICIA; RESTREPO,SILVIA; URIBE-VELEZ,DANIEL.
In the S. tuberosum group phureja crops, mineral fertilizer and organic amendments are applied to meet the plants´ nutritional demands, however the effect of such practices on the associated rizospheric microbial communities are still unknown. Nitrogen plays an important role in agricultural production, and a great diversity of microorganisms regulates its transformation in the soil, affecting its availability for the plant. The aim of this study was to assess the structure of microbial communities related with the N cycle of S. tuberosum group phureja rizospheric soil samples, with contrasting physical-chemical properties and fertilization strategy. Few significant differences between the community composition at the phylum level were found, only...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen cycle; Nitrification; Nitrogenase; Pyrosequencing; Solanum phureja.
Ano: 2013
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2013000300004

Nitrogenase activity of Beijerinckia derxii is preserved under adverse conditions for its growth
Provedor de dados: 58
Autores: Barbosa,Heloiza R.; Moretti,Marcos A.; Thuler,Daniela S.; Augusto,Elisabeth F.P.
In order to evaluate the response of Beijerinckia derxii ICB-10 to different environmental factors, growth curves and specific nitrogenase activity were studied. Tested conditions were as follows: a) media with different pH values (2.5, 2.8, 4.2 and 5.7); b) medium supplemented with 230 µM aluminium sulphate; c) media with two different potassium phosphate concentrations (50 mM and 100 mM); d) shaken or still cultures; e) medium supplemented with 40 mM sodium thiosulphate. Growth curves and specific nitrogenase activity at pH 4.2 were closely similar to those for cultures at pH 5.7 (standard condition), whereas no growth occurred at pH 2.5. Changes in growth curves and/or specific nitrogenase activity were observed under the following conditions: I) pH 2.8...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beijerinckia; Nitrogenase; Nitrogen fixation; Growth; Environmental factors.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000300007