Journal ArticleDOI
Symbiotic effectiveness of fast-growing rhizobial strains isolated from soybean nodules in Brazil
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TLDR
The symbiotic effectiveness of 30 fast-growing rhizobial strains isolated from soybean nodules in Brazil and of Sinorhizobium fredii reference strains was evaluated under greenhouse and field conditions and limits, at this time, their recommendation for use in commercial inocula are limits.Abstract:
The symbiotic effectiveness of 30 fast-growing rhizobial strains (doubling times of 85–225 min and acid reaction in yeast mannitol medium) isolated from soybean nodules in Brazil and of Sinorhizobium fredii reference strains was evaluated under greenhouse and field conditions Most Brazilian fast-growing strains were genetically related to the Rhizobium tropici-Rhizobium genomic species Q-Agrobacterium spp branch and five to the Bradyrhizobium japonicum and B elkanii species Under axenic conditions, some of the fast-growing strains fixed as much N2 as the B japonicum/B elkanii strains carried in Brazilian commercial inocula However, in a co-inoculation experiment, very few strains were able to compete against B elkanii strain SEMIA 5019 Although isolated from acid soils (pH 30–51), the competitiveness of Brazilian fast growers and of S fredii reference strains against B japonicum/B elkanii was low under acid conditions (pH 51 and pH 54), but increased when the pH was raised to 68 and 79 Therefore, as the great majority of Brazilian soils are acidic and show a very high population of naturalized B japonicum/B elkanii, the low competitiveness of S fredii and of the Brazilian rhizobial strains investigated in this study, under the given conditions, limits, at this time, their recommendation for use in commercial inocularead more
Citations
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Journal ArticleDOI
Widespread fitness alignment in the legume-rhizobium symbiosis
TL;DR: Positive correlations between legume and rhizobium fitness imply that most ineffective rhizobia are 'defective' rather than 'defectors'; this extends to natural variants, with only one significant fitness conflict.
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A meta-analysis of the effectiveness of diverse rhizobia inoculants on soybean traits under field conditions
TL;DR: This study highlights the need to understand more fully the rationale behind the continued use of these devices, as well as the barriers to their use, in the developing world.
Journal ArticleDOI
Emerging strategies for precision microbiome management in diverse agroecosystems.
TL;DR: In this paper, the authors introduce the historical arc of agricultural microbiome research, highlight current progress and emerging strategies for intentional microbiome manipulation to enhance crop performance and sustainability, and identify key knowledge gaps in our understanding of microbe-assisted crop production.
References
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Journal ArticleDOI
A Manual for the Practical Study of Root-Nodule Bacteria.
J. A. Callow,J. M. Vincent +1 more
TL;DR: A manual for the practical study of root-nodule bacteria, and a guide to the collection of and usage of such manuals.
Book
A manual for the practical study of root-nodule bacteria
TL;DR: A manual for the practical study of root-nodule bacteria is presented in this article, where the authors present a set of root nodule genes and root nodes.
Journal ArticleDOI
Environmental factors affecting n2 fixation in grain legumes in the tropics, with an emphasis on brazil
TL;DR: Biological nitrogen (N 2 ) fixation is key to sustainable agricultural systems in tropical soils, which are frequently deficient in N, but high temperature, drought and soil acidity constrain legume root-nodule formation and function in the tropics.
Journal ArticleDOI
NOTES: Transfer of Rhizobium japonicum Buchanan 1980 to Bradyrhizobium gen. nov., a Genus of Slow-Growing, Root Nodule Bacteria from Leguminous Plants
TL;DR: The slow-growing, non-acid-producing root nodule bacteria of leguminous plants should be separated from the fast- growing, acid-producing strains and placed in a new genus, and the name proposed is Bradyrhizobium.
Journal ArticleDOI
Polyphasic Taxonomy of Rhizobia: Emendation of the Genus Sinorhizobium and Description of Sinorhizobium meliloti comb. nov., Sinorhizobium saheli sp. nov., and Sinorhizobium teranga sp. nov.
Philippe de Lajudie,Anne Willems,Bruno Pot,Dirk Dewettinck,Gloria M. Maestrojuan,Marc Neyra,Matthew D. Collins,Bernard Dreyfus,Karel Kersters,Monique Gillis +9 more
TL;DR: Two of the clusters identified on the basis of SDS-PAGE data are genotypically and phenotypically distinct groups that belong on the Rhizobium meliloti-RhZobium fredii rRNA branch and contains strains isolated in Africa, in Brazil, and in New Zealand from different leguminous species.