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Title of Journal: Biol Fertil Soils

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Abbravation: Biology and Fertility of Soils

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Springer-Verlag

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DOI

10.1007/bf02705605

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1432-0789

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Evaluation of bradyrhizobia strains isolated from

Authors: Mariana Melchiorre Marcos J de Luca Gustavo Gonzalez Anta Paola Suarez Carlos Lopez Ramiro Lascano Roberto W Racca
Publish Date: 2010/09/22
Volume: 47, Issue: 1, Pages: 81-89
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Abstract

Bradyrhizobium strains were isolated from nodules obtained from fieldgrown soybean plants sampled in 12 soybean production locations in Argentina These fields had been annually cropped with soybean and did not show decreases in yields even though they had been neither Nfertilized nor inoculated for at least the last 5 years We hypothesized that the isolated strains maintained high competitiveness and efficiency in fixing adequate N2 levels A set of strains that showed the highest nodular occupancy in each sampling location were assayed for symbiotic performance under greenhouse and field conditions and comparatively evaluated with Bradyrhizobium japonicum E109 the strain officially recommended for inoculant formulation in Argentina An inoculant pool formed by four strains obtained from nodules collected from Cañada Rica developed higher nodular biomass than B japonicum E 109 in assays carried out in greenhouses under well irrigated conditions Additionally neither nodule production nor specific nitrogenase activity decreased with respect to B japonicum E 109 when plants were drought stressed during 7 days from sowing The mean yields obtained under field conditions and plotted against the principal component one CP1 obtained with an additive main effect and multiplicative interaction AMMI model showed that the inoculant pool from Cañada Rica had higher contribution to yield than strain E 109 although with lower environmental stability The inoculant pool from Cañada Rica could be considered an improved inoculant and be used for preliminary assays to formulate inoculants in ArgentinaThe authors thank Dr Mario Aguilar and his group IBBMCONICET La PlataArgentina for their assistance in the use of GelCompar II software and Dr Cecilia Bruno for her assistance in statistical data analysis MM and RL are CONICET researchers RR is CONICETINTA researcher MdL and CL are INTA researchers PS is INTAtechnician and GGA is manager of Rizobacter Argentina SA This work was partially supported by Rizobacter Argentina SA

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  1. Ammonia-oxidizing communities in agricultural soil incubated with organic waste residues
  2. Isolation and characterization of a mycorrhiza helper bacterium from rhizosphere soils of poplar stands
  3. Microbial community shifts in Pythium ultimum -inoculated suppressive substrates
  4. Evaluation of bradyrhizobia strains isolated from field-grown soybean plants in Argentina as improved inoculants
  5. Characterization of nitrifying bacteria communities of soils from different ecological regions of China by molecular and conventional methods
  6. Microbial community responsible for the decomposition of rice straw in a paddy field: estimation by phospholipid fatty acid analysis
  7. Short-term effects of forest recovery on soil carbon and nutrient availability in an experimental chestnut stand
  8. Decomposition of pea and maize straw in Pakistani soils along a gradient in salinity
  9. The effect of rhizobiophages on Sinorhizobium meliloti - Medicago sativa symbiosis
  10. Effect of entomopathogenic nematodes on the plant-parasitic nematode Nacobbus aberrans
  11. Impact on C and N dynamics of simultaneous application of pig slurry and wheat straw, as affected by their initial locations in soil
  12. Effects of warming and increased precipitation on soil carbon mineralization in an Inner Mongolian grassland after 6 years of treatments
  13. Phosphatase activities in soil after repeated untreated and alum-treated poultry litter applications
  14. Temperature sensitivity of soil organic matter decomposition—what do we know?
  15. Nodulation status of native woody legumes and phenotypic characteristics of associated rhizobia in soils of southern Ethiopia
  16. Soil organic carbon pools and productivity in relation to nutrient management in a 20-year-old rice–berseem agroecosystem
  17. Isoproturon mineralization in an agricultural soil
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  22. Contribution of earthworm activity to the infiltration of nitrogen in a wheat agroecosystem
  23. Dynamics of fine and coarse roots and nitrogen mineralization in a humid subtropical forest ecosystem of northeast India
  24. Relationship between archaeal community structure and vegetation type in a fen on the Qinghai–Tibetan Plateau
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