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1.
Sci. agric. ; 75(6): 461-469, Nov.-Dec.2018. tab
Artigo em Inglês | VETINDEX | ID: vti-18646

Resumo

A significant number of bacterial species, particularly in the rhizosphere, may benefit plant growth and development. This group of bacteria is known as plant growth-promoting rhizobacteria (PGPR). This study identified genetically isolates of common bean nodules used to trap bacteria from Amazon pastureland and investigated their capacity of nodulating and promoting growth of common bean when inoculated or co-inoculated with CIAT899 strain (Rhizobium tropici). Two experiments were carried out in a greenhouse, in axenic conditions, using the common bean cultivar Talismã. In the first experiment, 56 PGPR strains were evaluated individually regarding growth promotion and nodulation. In the second experiment, inoculation of seven PGPR strains previously selected in the first experiment was evaluated in three forms of N supply: Co-inoculation with CIAT 899 in the presence of low N-mineral concentration; individual inoculation in the presence of high N-mineral concentration; and individual inoculation in the presence of low N-mineral concentration. The 16S rRNA gene sequencing showed predominance of Pseudomonas genus, identified in 35 % of the sequenced strains. Other genera were identified: Rhizobium, Burkholderia, Xanthomonas and Bacillus. Inoculation of the seven strains with CIAT 899 promoted distinct plant growth in different forms of N supply. In addition, N-mineral supply can be replaced by co-inoculation with strains of Pseudomonas sp. (UFLA 02-281 and UFLA 02-293) and Bacillus sp. (UFLA 02-298) identified in this study.(AU)


Assuntos
Phaseolus/crescimento & desenvolvimento , Rizosfera , Desenvolvimento Vegetal , Pseudomonas , Biologia do Solo , Brasil
2.
Sci. agric ; 73(4): 301-310, 2016. tab
Artigo em Inglês | VETINDEX | ID: biblio-1497584

Resumo

Certain nodulating nitrogen-fixing bacteria in legumes and other nodule endophytes perform different plant-growth promoting processes. The objective of this study was to evaluate 26 bacterial strains isolated from cowpea nodules grown in floodplain soils in the Brazilian savannas, regarding performance of plant-growth promoting processes and ability to enhance cowpea growth. We also identified these strains by 16S rRNA sequencing. The following processes were evaluated: free-living biological nitrogen fixation (BNF), solubilization of calcium, aluminum and iron phosphates and production of indole-3-acetic acid (IAA). The abilities to nodulate and promote cowpea growth were evaluated in Leonard jars. Partial sequencing of the 16S rRNA gene identified 60 % of the strains as belonging to genus Paenibacillus. The following four genera were also identified: Bacillus, Bradyrhizobium, Enterobacter and Pseudomonas. None of the strains fixed N2 free-living. Among the strains, 80 % solubilized Ca phosphate and one solubilized Al phosphate and none solubilized Fe phosphate. The highest IAA concentrations (52.37, 51.52 and 51.00 g mL1) were obtained in the 79 medium with tryptophan by Enterobacter strains UFPI B5-7A, UFPI B5-4 and UFPI B5-6, respectively. Only eight strains nodulated cowpea, however, all increased production of total dry matter. The fact that the strains evaluated perform different biological processes to promote plant growth indicates that these strains have potential use in agricultural crops to increase production and environmental sustainability.


Assuntos
Bactérias , Fixação de Nitrogênio , Biotecnologia , Fosfatos , Nódulos Radiculares de Plantas , Paenibacillus , Pradaria
3.
Sci. agric. ; 73(4): 301-310, 2016. tab
Artigo em Inglês | VETINDEX | ID: vti-15520

Resumo

Certain nodulating nitrogen-fixing bacteria in legumes and other nodule endophytes perform different plant-growth promoting processes. The objective of this study was to evaluate 26 bacterial strains isolated from cowpea nodules grown in floodplain soils in the Brazilian savannas, regarding performance of plant-growth promoting processes and ability to enhance cowpea growth. We also identified these strains by 16S rRNA sequencing. The following processes were evaluated: free-living biological nitrogen fixation (BNF), solubilization of calcium, aluminum and iron phosphates and production of indole-3-acetic acid (IAA). The abilities to nodulate and promote cowpea growth were evaluated in Leonard jars. Partial sequencing of the 16S rRNA gene identified 60 % of the strains as belonging to genus Paenibacillus. The following four genera were also identified: Bacillus, Bradyrhizobium, Enterobacter and Pseudomonas. None of the strains fixed N2 free-living. Among the strains, 80 % solubilized Ca phosphate and one solubilized Al phosphate and none solubilized Fe phosphate. The highest IAA concentrations (52.37, 51.52 and 51.00 g mL1) were obtained in the 79 medium with tryptophan by Enterobacter strains UFPI B5-7A, UFPI B5-4 and UFPI B5-6, respectively. Only eight strains nodulated cowpea, however, all increased production of total dry matter. The fact that the strains evaluated perform different biological processes to promote plant growth indicates that these strains have potential use in agricultural crops to increase production and environmental sustainability.(AU)


Assuntos
Fixação de Nitrogênio , Bactérias , Nódulos Radiculares de Plantas , Pradaria , Paenibacillus , Fosfatos , Biotecnologia
4.
Braz. j. vet. res. anim. sci ; 44(3): 183-190, 2007. graf, tab
Artigo em Português | VETINDEX | ID: vti-5410

Resumo

Objetivou-se determinar a atividade sérica das enzimas aspartato aminotransferase (AST), creatina quinase (CK) e lactato desidrogenase (LDH) de cavalos da raça Árabe submetidos a exercício em esteira de alta velocidade. Onze eqüinos adultos da raça Árabe foram condicionados e submetidos ao Teste Padrão de Exercício Progressivo em esteira. Antes, imediatamente após o término do exercício, e nos momentos pós-exercício, 30min, 60min, 3h, 6h, 12h, 24h, 3 dias e 5 dias, foram coletadas amostras de sangue venoso para as determinações séricas das enzimas aspartato aminotransferase (AST), creatina quinase (CK) e lactato desidrogenase (LDH). As concentrações séricas da AST, da CK e da LDH elevam-se imediatamente e retornam a valores semelhantes ao de repouso 30 minutos após o término do Teste Padrão de Exercício Progressivo. A atividade enzimática da aspartato aminotransferase (AST) eleva-se de 12 horas a 24 horas, da creatina quinase (CK) de 3 horas a 6 horas e da lactato desidrogenase (LDH) 24 horas após o término do Teste Padrão de Exercício Progressivo.(AU)


The aim of this study was to determine the serum activities of enzymes aspartate aminotransferase, creatine kinase and lactate dehydrogenase in Arabian horses submitted to exercise on high-speed equine treadmill. Eleven mature Arabian horse were training and submitted to Standard Incremental Exercise Test on high-speed equine treadmill. Venous blood samples were taken before exercise, immediately and 30 min, 60min, 3h, 6h, 24h, 3 days and 5 days after exercise. The serum activity aspartate aminotransferase, creatine kinase and lactate dehydrogenase were determined. The serum activies of AST, CK and LDH increase immediately and returned to baseline value 30 minutes after exercise. The AST enzyme activity increased at 12 hours and 24 hours, CK at 3 hours and 6 hours, and LDH at 24 hours after Standard Incremental Exercise Test.(AU)


Assuntos
Animais , Masculino , Feminino , Aspartato Aminotransferases/efeitos adversos , Aspartato Aminotransferases/sangue , Creatina Quinase/efeitos adversos , Creatina Quinase/sangue , L-Lactato Desidrogenase/efeitos adversos , L-Lactato Desidrogenase/sangue , Exercício Físico/fisiologia , Equidae
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