Abstract
Rhizosheaths are structures composed of mucilage secreted from plants and adherent soil particles that form a cylinder around the root. Using scanning electron microscopy (SEM), we observed bacteria associated with rhizosheaths of the grasses Achnatherum hymenoides, Calamovilfa longifolia, Hesperostipa comata, and Pascopyrum smithii from a sand dune area in Harding County in northwestern South Dakota. The greatest numbers of bacteria, observed with SEM (529 mm-2), and the greatest number of culturable bacteria (9.9 × 107 CFU · g-1 or 5178 CFU · mm-2) were on rhizosheaths of C. longifolia. Rhizosheaths of all the grasses examined contained a higher density of bacteria than the surrounding soil. Nitrogen fixation, as assayed by reduction of acetylene to ethylene, was present in some rhizosheaths. Bacterial nifH gene sequences amplified from bacteria associated with rhizosheaths were most similar to those from Alcaligenes latus and Mesorhizobium loti.
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Claims 5
Claim · model-written summary
Bacteria counted by SEM were most numerous on Calamovilfa longifolia rhizosheaths, at 529 mm-2.
- Taxon
- C. longifolia
Sporobolus rigiduse1 - Organ / stage
- rhizosheathse1
- Outcome
- numbers of bacteriae1
- Value
- 529 mm-2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The greatest numbers of bacteria, observed with SEM (529 mm-2), and the greatest number of culturable bacteria (9.9 × 107 CFU · g-1 or 5178 CFU · mm-2) were on rhizosheaths of C. longifolia”
Claim · model-written summary
Culturable bacteria were most numerous on Calamovilfa longifolia rhizosheaths, at 9.9 × 107 CFU · g-1 or 5178 CFU · mm-2.
- Taxon
- C. longifoliaSporobolus rigiduse1
- Organ / stage
- rhizosheathse1
- Outcome
- number of culturable bacteriae1
- Value
- 9.9 × 107 CFU · g-1 or 5178 CFU · mm-2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The greatest numbers of bacteria, observed with SEM (529 mm-2), and the greatest number of culturable bacteria (9.9 × 107 CFU · g-1 or 5178 CFU · mm-2) were on rhizosheaths of C. longifolia”
Claim · model-written summary
Rhizosheaths of the grasses had a higher density of bacteria than the surrounding soil.
Verbatim
e2“Rhizosheaths of all the grasses examined contained a higher density of bacteria than the surrounding soil”
Claim · model-written summary
Nitrogen fixation was present in some rhizosheaths of the grasses.
Verbatim
e0“Using scanning electron microscopy (SEM), we observed bacteria associated with rhizosheaths of the grasses Achnatherum hymenoides, Calamovilfa longifolia, Hesperostipa comata, and Pascopyrum smithii”
e3“Nitrogen fixation, as assayed by reduction of acetylene to ethylene, was present in some rhizosheaths”
Claim · model-written summary
nifH gene sequences from rhizosheath bacteria were most similar to those of Alcaligenes latus and Mesorhizobium loti.
- Taxon
- grassese0
- Interactor
- Mesorhizobium loti
Mesorhizobium lotie4symbiont - Second interactor
- Alcaligenes latusAzohydromonas latae4other
- Gene
- nifHe4
- Outcome
- nifH gene sequencese4
- Qualifier
- most similar to those from Alcaligenes latus and Mesorhizobium lotie4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Using scanning electron microscopy (SEM), we observed bacteria associated with rhizosheaths of the grasses Achnatherum hymenoides, Calamovilfa longifolia, Hesperostipa comata, and Pascopyrum smithii”
e4“Bacterial nifH gene sequences amplified from bacteria associated with rhizosheaths were most similar to those from Alcaligenes latus and Mesorhizobium loti”