Nodule Occupancy
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. Rhizobium strains competitiveness on bean nodulation in Cerrado soils.
The objective of this work was to identify the most competitive and effective Rhizobium strains in order to increase common bean yield by nitrogen fixation as alternative or complementation to the nitrogen fertilization. Competitiveness tests were lead in axenic conditions, in Cerrado soil pots and in three field experiments, with native Rhizobium strains th
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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2. Rapid Colored-Nodule Assay for Assessing Root Exudate-Enhanced Competitiveness of Bradyrhizobium japonicum
The effects of root exudate (RE) treatment on nodule occupancy by Bradyrhizobium japonicum were investigated by a rapid colored-nodule assay, which is based on the observation that B. japonicum L-110 and its antibiotically marked derivatives form dark-red nodules on certain soybean (Glycine max) cultivars, whereas other strains form beige nodules. The effica
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3. Trifolitoxin Production Increases Nodulation Competitiveness of Rhizobium etli CE3 under Agricultural Conditions
A major barrier to the use of nitrogen-fixing inoculum strains for the enhancement of legume productivity is the inability of commercially available strains to compete with indigenous rhizobia for nodule formation. Despite extensive research on nodulation competitiveness, there are no examples of field efficacy studies of strains that have been genetically i
American Society for Microbiology.
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4. Nodulation of Glycine max by Six Bradyrhizobium japonicum Strains with Different Competitive Abilities †
The root nodule locations of six Bradyrhizobium japonicum strains were examined to determine if there were any differences which might explain their varying competitiveness for nodule occupancy on Glycine max. When five strains were added to soybeans in plastic growth pouches in equal proportions with a reference strain (U.S. Department of Agriculture, strai
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5. 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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6. Influence of Lime and Phosphate on Nodulation of Soil-Grown Trifolium subterraneum L. by Indigenous Rhizobium trifolii†
Previous research had identified four serogroups of Rhizobium trifolii indigenous to the acidic Abiqua soil (fine, mixed, mesic Cumulic Ultic Haploxeroll). Nodulation of subterranean clover (Trifolium subterraneum L.) by two of the serogroups, 6 and 36, was differentially influenced by an application of CaCO3 which raised the pH of the soil from 5.0 to 6.5.
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7. Localization of Bacteria and Hemoglobin in Root Nodules of Parasponia andersonii Containing Both Bradyrhizobium Strains and Rhizobium leguminosarum biovar trifolii
Dual occupancy of Parasponia andersonii nodules with different Bradyrhizobium strains and Rhizobium leguminosarum biovar trifolii was frequently obtained when two strains were inoculated into plants grown aseptically in tubes. Since reisolates of Bradyrhizobium strains from dually occupied nodules acquired the ability to nodulate Trifolium repens, the spatia
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8. Compatibility of Rhizobial Genotypes within Natural Populations of Rhizobium leguminosarum Biovar viciae for Nodulation of Host Legumes
Populations of Rhizobium leguminosarum biovar viciae were sampled from two bulk soils, rhizosphere, and nodules of host legumes, fava bean (Vicia faba) and pea (Pisum sativum) grown in the same soils. Additional populations nodulating peas, fava beans, and vetches (Vicia sativa) grown in other soils and fava bean-nodulating strains from various geographic si
American Society for Microbiology.
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9. Competitive Ability and Efficiency in Nodule Formation of Strains of Bradyrhizobium japonicum†
In the American Midwest, superior N2-fixing inoculant strains of Bradyrhizobium japonicum consistently fail to produce the majority of nodules on the roots of field-grown soybean. Poor nodulation by inoculant strains is partly due to their inability to stay abreast of the expanding soybean root system in numbers sufficient for them to be competitive with ind
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10. Bradyrhizobium japonicum-Environment Interactions: Nodulation and Interstrain Competition in Soils along an Elevational Transect †
The effects of temperature and soil type on interstrain competition of Bradyrhizobium japonicum and on nodulation and nitrogen accumulation in five soybean varieties belonging to four maturity groups were investigated at three sites devoid of soybean rhizobia along an elevational transect in Hawaii. Competition patterns of the three B. japonicum strains were
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11. Nodulation and Competition for Nodulation of Selected Soybean Genotypes among Bradyrhizobium japonicum Serogroup 123 Isolates
Twenty recently obtained field isolates of Bradyrhizobium japonicum serogroup 123 were tested for their nodule mass production on the standard commercial soybean (Glycine max (L.) Merr. cv. Williams) and on two soybean plant introduction (PI) genotypes previously determined to restrict nodulation by strain USDA 123. Four of the field isolates showed similar
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12. Early Infection and Competition for Nodulation of Soybean by Bradyrhizobium japonicum 123 and 138 †
Interactions of soybean with Bradyrhizobium japonicum 123 (serogroup 123) and 138 (serogroup c1) were used to examine the relationship between early infection rates, competition for nodulation, and patterns of nodule occupancy. Both strains formed more infections in autoclaved soil (sterile soil) than in untreated soil (unsterile soil). Inoculation did not i