Bradyrhizobia
Mostrando 1-12 de 37 artigos, teses e dissertações.
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1. Avaliação da sobrevivência de bradirrizóbios em sementes de soja tratadas com fungicidas, protetor celular "power" e o inoculante "nitragin optimize"
O Brasil é considerado o segundo maior produtor de soja do mundo, e ocupa o primeiro lugar em exportação desse grão. A aplicação de técnicas agrícolas modernas tem grande importância no alcance e manutenção desse patamar. Entre essas técnicas destacam-se o surgimento do inoculante, o tratamento de sementes com fungicida e a adubação de micronut
Publicado em: 2009
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2. Subgroups of the Cowpea Miscellany: Symbiotic Specificity within Bradyrhizobium spp. for Vigna unguiculata, Phaseolus lunatus, Arachis hypogaea, and Macroptilium atropurpureum†
Rhizobia classified as Bradyrhizobium spp. comprise a highly heterogeneous group of bacteria that exhibit differential symbiotic characteristics on hosts in the cowpea miscellany cross-inoculation group. To delineate the degree of specificity exhibited by four legumes in the cowpea miscellany, we tested the symbiotic characteristics of indigenous cowpea brad
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3. Preincubation of Bradyrhizobium japonicum with Genistein Accelerates Nodule Development of Soybean at Suboptimal Root Zone Temperatures.
In the soybean (Glycine max [L.] Merr.) N2-fixing symbiosis, suboptimal root zone temperatures (RZTs) slow nodule development, especially at temperatures below 17[deg]C. A step in the infection process that occurs within the first 24 h is particularly sensitive to suboptimal RZT. The first phase in the establishment of the soybean-Bradyrhizobium japonicum sy
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4. Variation of Clonal, Mesquite-Associated Rhizobial and Bradyrhizobial Populations from Surface and Deep Soils by Symbiotic Gene Region Restriction Fragment Length Polymorphism and Plasmid Profile Analysis
Genetic characteristics of 14 Rhizobium and 9 Bradyrhizobium mesquite (Prosopis glandulosa)-nodulating strains isolated from surface (0- to 0.5-m) and deep (4- to 6-m) rooting zones were determined in order to examine the hypothesis that surface- and deep-soil symbiont populations were related but had become genetically distinct during adaptation to contrast
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5. Divergent mechanisms of 5′ 23S rRNA IVS processing in the α-proteobacteria
Widespread occurrence of a separate small RNA derived from the 5′-end of 23S rRNA and of an intervening sequence (IVS) which separates this domain from the main segment of 23S rRNA in the α-proteobacteria implies that processing reactions which act to excise the IVS are also maintained in this group. We previously characterized the first example of proces
Oxford University Press.
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6. Influence of 5-Methyltryptophan-Resistant Bradyrhizobium japonicum on Soybean Root Nodule Indole-3-Acetic Acid Content †
Bradyrhizobium japonicum mutants resistant to 5-methyltryptophan were isolated. Some of these mutants were found to accumulate indole-3-acetic acid (IAA) and tryptophan in culture. In greenhouse studies, nodules from control plants inoculated with wild-type bradyrhizobia contained 0.04, 0.10, and 0.58 μg of free, ester-linked, and peptidyl IAA g (fresh weig
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7. Bradyrhizobium japonicum Inoculant Mobility, Nodule Occupancy, and Acetylene Reduction in the Soybean Root System
In the American Midwest, superior inoculant rhizobia applied to soybeans usually occupy only 5 to 20% of nodules, and response to inoculation is the exception rather than the rule. Attempts to overcome this problem have met with limited success. We evaluated the ability of Bradyrhizobium japonicum, supplied as a seed coat inoculant, to stay abreast of the in
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8. Bradyrhizobia from Wild Phaseolus, Desmodium, and Macroptilium Species in Northern Mexico
rRNA genetic markers were analyzed in 97 isolates of nodule bacteria from six legume species in Chihuahua, Mexico. The most common genotypes were widely shared across host species and had 16S rRNA sequences identical to those of strains from an eastern North American legume (Amphicarpaea) that are closely related to Bradyrhizobium elkanii.
American Society for Microbiology.
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9. Cloning of nod gene regions from mesquite rhizobia and bradyrhizobia and nucleotide sequence of the nodD gene from mesquite rhizobia.
Nitrogen-fixing symbiosis between bacteria and the tree legume mesquite (Prosopis glandulosa) is important for the maintenance of many desert ecosystems. Genes essential for nodulation and for extending the host range to mesquite were isolated from cosmid libraries of Rhizobium (mesquite) sp. strain HW17b and Bradyrhizobium (mesquite) sp. strain HW10h and we
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10. Fragmentations of the large-subunit rRNA in the family Rhizobiaceae.
A 130-nucleotide-long rRNA species corresponding to the 5' end of the 23S rRNA gene was found in 96 strains belonging to different Rhizobium, Bradyrhizobium, and Agrobacterium species. Additional fragmentation in the central region of the large-subunit rRNA occurred in all agrobacteria, except Agrobacterium vitis, and in most Rhizobium leguminosarum and Rhiz
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11. Evidence for a Third Uptake Hydrogenase Phenotype among the Soybean Bradyrhizobia
The existence of a hydrogen uptake host-regulated (Hup-hr) phenotype was established among the soybean bradyrhizobia. The Hup-hr phenotype is characterized by the expression of uptake hydrogenase activity in symbiosis with cowpea but not soybean. Uptake hydrogenase induction is not possible under free-living cultural conditions by using techniques developed
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12. A Selective Medium for the Isolation and Quantification of Bradyrhizobium japonicum and Bradyrhizobium elkanii Strains from Soils and Inoculants †
The ecological examination of members of the family Rhizobiaceae has been hampered by the lack of a selective medium for isolation of root nodule bacteria from soil. A novel non-antibiotic-containing medium has been developed which allows selective isolation of Bradyrhizobium japonicum and B. elkanii strains from soil and inoculants. The medium, BJSM, is bas