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Pesquisa : B03.300.390.400.645 [Categoria DeCS]
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Texto completo SciELO Brasil
Texto completo
Id: biblio-976384
Autor: Pessoa, Danielle A. N; Silva, Layze C. A; Mendonça, Fábio S; Almeida, Valdir M; Lopes, José R. G; Albuquerque, Laio G; Silva, Amanda A; Riet-Correa, Franklin.
Título: Evaluation of resistance to natural poisoning by Amorimia septentrionalis in goats which had received sodium monofluoroacetate degrading bacteria / Avaliação da resistência à intoxicação natural por Amorimia septentrionalis em caprinos que receberam bactérias degradadoras de monofluoroacetato de sódio
Fonte: Pesqui. vet. bras = Braz. j. vet. res;38(10):1913-1917, out. 2018. tab, ilus.
Idioma: en.
Projeto: CNPq.
Resumo: Amorimia septentrionalis is an important sodium monofluoroacetate (MFA) containing plant that causes sudden death in ruminants in northeastern Brazil. MFA degrading bacteria are being used in the prevention against poisoning by this plant. The aim of this study was to evaluate if goats which had per os received MFA degrading bacteria remained resistant when exposed to natural poisoning by A. septentrionalis. Eighteen goats were randomly distributed into three groups: the goats of Group 1 previously received, during 40 days, a solution containing the bacteria Ralstonia sp. and Burkholderia sp., those goats in the Group 2 received the bacteria Paenibacillus sp. and Cupriavidus sp. and goats from Group 3 did not receive any bacteria. After the administration period, during 60 days, the animals of all groups were released to graze on a one hectare paddock, with significant amount of A. septentrionalis. They were observed daily for the spontaneous consumption of A. septentrionalis leaves and the occurrence of clinical signs of poisoning or sudden death. Goats from all groups consumed significant amounts of A. septentrionalis during the experimental period. Goats that did not receive MFA-degrading bacteria (Group 3) became sick and died from the 25th to the 27th day of the experiment, whereas the goats of the groups that received MFA-degrading bacteria showed only clinical sings when A. septentrionalis regrowth after the 55th day of the experiment. The days elapsed from field observation to death of Group 3 goats (25.5±0.9 days) were significantly lower (p<0.05) than Group 1 (58.6±1.3 days) and Group 2 (57.8±1.5 days). Thus, it can be concluded that administration of MFA degrading bacteria increases the resistance to natural poisoning by A. septentrionalis.(AU)

Amorimia septentrionalis que contém monofluoroacetato de sódio (MFA) é responsável pela ocorrência de mortes súbitas em ruminantes no nordeste do Brasil. Bactérias degradadoras desse composto estão sendo utilizadas na prevenção contra a intoxicação por essa planta. O objetivo deste estudo foi avaliar se caprinos que receberam, via oral, bactérias degradadoras de MFA permaneciam resistentes quando expostos a intoxicação natural por A. septentrionalis. Dezoito caprinos foram divididos em três grupos, os caprinos do Grupo 1 receberam anteriormente, durante 40 dias, uma solução contendo as bactérias Ralstonia sp. e Burkholderia sp., os do Grupo 2 receberam, também por 40 dias as bactérias Paenibacillus sp. e Cupriavidus sp. e os do Grupo 3 não receberam nenhuma bactéria. Após o período de administração, durante 60 dias, os animais de todos os grupos foram soltos para pastar em um piquete de um hectare, que apresentava uma quantidade significativa da planta. Diariamente eles foram observados quanto ao consumo espontâneo das folhas de A. septentrionalis e quanto à presença de sinais clínicos de intoxicação ou morte. Os caprinos de todos os grupos consumiram quantidades significantes da planta durante o período experimental. Os caprinos que não receberam as bactérias degradantes de MFA (Grupo 3) adoeceram e morreram entre o 25º e o 27º dia de experimento, enquanto que os que receberam as bactérias degradantes de MFA (Grupo 1 e 2) só apresentaram sinais clínicos no 55º dia de experimento, o que coincidiu com a rebrota da planta. Os dias transcorridos desde a observação a campo até a morte dos caprinos do Grupo 3 (25,5±0,9 dias) foram significativamente menores (p<0,05) que os do Grupo 1 (58,6±1,3 dias) e do Grupo 2 (57,8±1,5 dias). Com isso pode-se concluir que a administração de bactérias degradadoras de MFA aumenta à resistência a intoxicação natural por A. septentrionalis.(AU)
Descritores: Intoxicação por Plantas/terapia
Intoxicação por Plantas/veterinária
Fluoracetatos/antagonistas & inibidores
Limites: Animais
Responsável: BR68.1 - Biblioteca Virginie Buff D'Ápice

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Texto completo SciELO Brasil
Texto completo
Id: biblio-889178
Autor: Liu, Di; Yang, Qianqian; Ge, Ke; Hu, Xiuna; Qi, Guozhen; Du, Binghai; Liu, Kai; Ding, Yanqin.
Título: Promotion of iron nutrition and growth on peanut by Paenibacillus illinoisensis and Bacillus sp. strains in calcareous soil
Fonte: Braz. j. microbiol;48(4):656-670, Oct.-Dec. 2017. tab, graf.
Idioma: en.
Projeto: National Natural Science Foundation of China; . Science and Technology Major Projects of Shandong Province.
Resumo: ABSTRACT This study aimed to explore the effects of two siderophore-producing bacterial strains on iron absorption and plant growth of peanut in calcareous soil. Two siderophore-producing bacterial strains, namely, YZ29 and DZ13, isolated from the rhizosphere soil of peanut, were identified as Paenibacillus illinoisensis and Bacillus sp., respectively. In potted experiments, YZ29 and DZ13 enhanced root activity, chlorophyll and active iron content in leaves, total nitrogen, phosphorus and potassium accumulation of plants and increased the quality of peanut kernels and plant biomass over control. In the field trial, the inoculated treatments performed better than the controls, and the pod yields of the three treatments inoculated with YZ29, DZ13, and YZ29 + DZ13 (1:1) increased by 37.05%, 13.80% and 13.57%, respectively, compared with the control. Based on terminal restriction fragment length polymorphism analysis, YZ29 and DZ13 improved the bacterial community richness and species diversity of soil surrounding the peanut roots. Therefore, YZ29 and DZ13 can be used as candidate bacterial strains to relieve chlorosis of peanut and promote peanut growth. The present study is the first to explore the effect of siderophores produced by P. illinoisensis on iron absorption.
Descritores: Arachis/crescimento & desenvolvimento
Sementes/crescimento & desenvolvimento
Microbiologia do Solo
Bacillus/isolamento & purificação
Transporte Biológico
Raízes de Plantas/microbiologia
Paenibacillus/isolamento & purificação
Inoculantes Agrícolas/metabolismo
Responsável: BR1.1 - BIREME

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Texto completo SciELO Brasil
Texto completo
Id: lil-769669
Autor: Zhao, Longfei; Xu, Yajun; Lai, Xin-He; Shan, Changjuan; Deng, Zhenshan; Ji, Yuliang.
Título: Screening and characterization of endophytic Bacillus and Paenibacillus strains from medicinal plant Lonicera japonica for use as potential plant growth promoters
Fonte: Braz. j. microbiol;46(4):977-989, Oct.-Dec. 2015. tab, graf.
Idioma: en.
Projeto: National Science Foundation of China; . Henan Provincial Education Department of Science and Technology Research Key Research Project; . Ministry of Education of Henan Province.
Resumo: Abstract A total of 48 endophytic bacteria were isolated from surface-sterilized tissues of the medicinal plant Lonicera japonica, which is grown in eastern China; six strains were selected for further study based on their potential ability to promote plant growth in vitro (siderophore and indoleacetic acid production). The bacteria were characterized by phylogenetically analyzing their 16S rRNA gene similarity, by examining their effect on the mycelial development of pathogenic fungi, by testing their potential plant growth-promoting characteristics, and by measuring wheat growth parameters after inoculation. Results showed that the number of endophytic bacteria in L. japonica varied among different tissues, but it remained relatively stable in the same tissues from four different plantation locations. Among the three endophytic strains, strains 122 and 124 both had high siderophore production, with the latter showing the highest phosphate solubilization activity (45.6 mg/L) and aminocyclopropane-1-carboxylic acid deaminase activity (47.3 nmol/mg/h). Strain 170 had the highest indoleacetic acid (IAA) production (49.2 mg/L) and cellulase and pectinase activities. After inoculation, most of the six selected isolates showed a strong capacity to promote wheat growth. Compared with the controls, the increase in the shoot length, root length, fresh weight, dry weight, and chlorophyll content was most remarkable in wheat seedlings inoculated with strain 130. The positive correlation between enzyme (cellulose and pectinase) activity and inhibition rate on Fusarium oxysporum, the IAA production, and the root length of wheat seedlings inoculated with each tested endophytic strain was significant in regression analysis. Deformity of pathogenic fungal mycelia was observed under a microscope after the interaction with the endophytic isolates. Such deformity may be directly related to the production of hydrolytic bacterial enzymes (cellulose and pectinase). The six endophytic bacterial strains were identified to be Paenibacillus and Bacillus strains based on the results of 16S rRNA gene sequencing analysis and their physiological and biochemical characteristics. Results indicate the promising application of endophytic bacteria to the biological control of pathogenic fungi and the improvement of wheat crop growth.
Descritores: Bacillus/classificação
Bacillus/crescimento & desenvolvimento
Bacillus/isolamento & purificação
China/crescimento & desenvolvimento
China/isolamento & purificação
Endófitos/crescimento & desenvolvimento
Endófitos/isolamento & purificação
Ácidos Indolacéticos/classificação
Ácidos Indolacéticos/genética
Ácidos Indolacéticos/crescimento & desenvolvimento
Ácidos Indolacéticos/isolamento & purificação
Ácidos Indolacéticos/metabolismo
Ácidos Indolacéticos/microbiologia
Lonicera/crescimento & desenvolvimento
Lonicera/isolamento & purificação
Dados de Sequência Molecular/classificação
Dados de Sequência Molecular/genética
Dados de Sequência Molecular/crescimento & desenvolvimento
Dados de Sequência Molecular/isolamento & purificação
Dados de Sequência Molecular/metabolismo
Dados de Sequência Molecular/microbiologia
Paenibacillus/crescimento & desenvolvimento
Paenibacillus/isolamento & purificação
Filogenia/crescimento & desenvolvimento
Filogenia/isolamento & purificação
Raízes de Plantas/classificação
Raízes de Plantas/genética
Raízes de Plantas/crescimento & desenvolvimento
Raízes de Plantas/isolamento & purificação
Raízes de Plantas/metabolismo
Raízes de Plantas/microbiologia
Sideróforos/crescimento & desenvolvimento
Sideróforos/isolamento & purificação
Triticum/crescimento & desenvolvimento
Triticum/isolamento & purificação
Responsável: BR1.1 - BIREME

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Texto completo SciELO Brasil
Texto completo
Id: lil-749711
Autor: Marra, Leandro M.; Oliveira-Longatti, Silvia M. de; Soares, Cláudio R.F.S.; Lima, José M. de; Olivares, Fabio L.; Moreira, Fatima M.S..
Título: Initial pH of medium affects organic acids production but do not affect phosphate solubilization
Fonte: Braz. j. microbiol;46(2):367-375, Apr-Jun/2015. tab, graf.
Idioma: en.
Projeto: CNPq.
Resumo: The pH of the culture medium directly influences the growth of microorganisms and the chemical processes that they perform. The aim of this study was to assess the influence of the initial pH of the culture medium on the production of 11 low-molecular-weight organic acids and on the solubilization of calcium phosphate by bacteria in growth medium (NBRIP). The following strains isolated from cowpea nodules were studied: UFLA03-08 (Rhizobium tropici), UFLA03-09 (Acinetobacter sp.), UFLA03-10 (Paenibacillus kribbensis), UFLA03-106 (Paenibacillus kribbensis) and UFLA03-116 (Paenibacillus sp.). The strains UFLA03-08, UFLA03-09, UFLA03-10 and UFLA03-106 solubilized Ca3(PO4)2 in liquid medium regardless of the initial pH, although without a significant difference between the treatments. The production of organic acids by these strains was assessed for all of the initial pH values investigated, and differences between the treatments were observed. Strains UFLA03-09 and UFLA03-10 produced the same acids at different initial pH values in the culture medium. There was no correlation between phosphorus solubilized from Ca3(PO4)2 in NBRIP liquid medium and the concentration of total organic acids at the different initial pH values. Therefore, the initial pH of the culture medium influences the production of organic acids by the strains UFLA03-08, UFLA03-09, UFLA03-10 and UFLA03-106 but it does not affect calcium phosphate solubilization.
Descritores: Acinetobacter/metabolismo
Ácidos Carboxílicos/metabolismo
Meios de Cultura/química
Rhizobium tropici/metabolismo
-Acinetobacter/crescimento & desenvolvimento
Acinetobacter/isolamento & purificação
Concentração de Íons de Hidrogênio
Paenibacillus/crescimento & desenvolvimento
Paenibacillus/isolamento & purificação
Rhizobium tropici/crescimento & desenvolvimento
Rhizobium tropici/isolamento & purificação
Nódulos Radiculares de Plantas/microbiologia
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME

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Texto completo SciELO Chile
Texto completo
Id: lil-548033
Autor: Erturk, Yasar; Ercisli, Sezai; Haznedar, Ayhan; Cakmakci, Ramazan.
Título: Effects of plant growth promoting rhizobacteria (PGPR) on rooting and root growth of kiwifruit (Actinidia deliciosa) stem cuttings
Fonte: Biol. Res;43(1):91-98, 2010. tab.
Idioma: en.
Resumo: The effects of plant growth promoting rhizobacteria (PGPR) on the rooting and root growth of semi-hardwood and hardwood kiwifruit stem cuttings were investigated. The PGPR used were Bacillus RC23, Paenibacillus polymyxa RC05, Bacillus subtilis OSU142, Bacillus RC03, Comamonas acidovorans RC41, Bacillus megaterium RC01 and Bacillus simplex RC19. All the bacteria showed indole-3-acetic acid (IAA) producing capacity. Among the PGPR used, the highest rooting ratios were obtained at 47.50 percent for semi-hardwood stem cuttings from Bacillus RC03 and Bacillus simplex RC19 treatments and 42.50 percent for hardwood stem cuttings from Bacillus RC03. As well, Comamonas acidovorans RC41 inoculations indicated higher value than control treatments. The results suggest that these PGPR can be used in organic nursery material production and point to the feasibility of synthetic auxin (IBA) replacement by organic management based on PGPR.
Descritores: Actinidia/crescimento & desenvolvimento
Ácidos Indolacéticos/farmacologia
Reguladores de Crescimento de Planta/farmacologia
Raízes de Plantas/crescimento & desenvolvimento
Caules de Planta/crescimento & desenvolvimento
-Actinidia/efeitos dos fármacos
Delftia acidovorans/química
Raízes de Plantas/efeitos dos fármacos
Caules de Planta/efeitos dos fármacos
Responsável: BR1.1 - BIREME

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