Abstract
Sorghum (Sorghum bicolor (L.) Moench cv. Bok 8) plants were grown in either a high peat or a low organic matter substrate and inoculated with a pigmented strain of Azospirillum brasilense (Cd). Half of the plants were also inoculated with the vesicular–arbuscular mycorrhizal (VAM) fungus Glomus etunicatum, while the remaining plants were fertilized with levels of phosphorus that had been found to be comparable to P input resulting from mycorrhizal colonization. Plants were harvested 1, 3, 5, and 7 weeks postemergence. Total plant dry weight was statistically similar (p > 0.05) between the two treatments for each substrate at all harvests. For each substrate, Azospirillum counts per gram of root were significantly (p < 0.05) higher in mycorrhizal roots at all harvests than in P-fertilized roots, and also higher in the high peat substrate compared with the low organic matter substrate. The ratio of the total number of inoculated A. brasilense cells in the Glomus-colonized compared to the P-fertilized roots was positively and significantly correlated (r = 0.81; p < 0.05) with % VAM colonization. Colonization of sorghum roots by G. etunicatum thus enhanced the establishment and persistence of A. brasilense in the endorhizosphere of sorghum.Key words: Azospirillum brasilense, endomycorrhizae, Glomus etunicatum, rhizosphere, Sorghum bicolor.
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Claims 5
Claim · model-written summary
Total plant dry weight was statistically similar between mycorrhizal and phosphorus-fertilized sorghum plants.
- Treatment
- also inoculated with the vesicular–arbuscular mycorrhizal (VAM) fungus Glomus etunicatume1
- Interactor
- Glomus etunicatume1symbiont
- Second interactor
- Azospirillum brasilense
Azospirillum brasilensee0symbiont - Outcome
- Total plant dry weighte2
- Direction
- statistically similare2
- Comparator
- fertilized with levels of phosphoruse1
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum – Glomus – Azospirillum association”
e0“Sorghum (Sorghum bicolor (L.) Moench cv. Bok 8) plants were grown in either a high peat or a low organic matter substrate and inoculated with a pigmented strain of Azospirillum brasilense (Cd)”
e1“Half of the plants were also inoculated with the vesicular–arbuscular mycorrhizal (VAM) fungus Glomus etunicatum, while the remaining plants were fertilized with levels of phosphorus that had been found to be comparable to P input resulting from mycorrhizal colonization”
e2“Total plant dry weight was statistically similar (p > 0.05) between the two treatments for each substrate at all harvests”
Claim · model-written summary
Azospirillum counts per gram of root were significantly higher in mycorrhizal roots than in P-fertilized roots at all harvests.
- Treatment
- mycorrhizal rootse3
- Interactor
- Azospirillum
Azospirillume3symbiont - Second interactor
- Glomus etunicatume1symbiont
- Outcome
- Azospirillum counts per gram of roote3
- Direction
- highere3
- Comparator
- P-fertilized rootse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum – Glomus – Azospirillum association”
e1“Half of the plants were also inoculated with the vesicular–arbuscular mycorrhizal (VAM) fungus Glomus etunicatum, while the remaining plants were fertilized with levels of phosphorus that had been found to be comparable to P input resulting from mycorrhizal colonization”
e3“For each substrate, Azospirillum counts per gram of root were significantly (p < 0.05) higher in mycorrhizal roots at all harvests than in P-fertilized roots, and also higher in the high peat substrate compared with the low organic matter substrate”
Claim · model-written summary
Azospirillum counts per gram of root were higher in the high peat substrate than in the low organic matter substrate.
- Treatment
- high peat substratee3
- Interactor
- AzospirillumAzospirillume3symbiont
- Outcome
- Azospirillum counts per gram of roote3
- Direction
- highere3
- Comparator
- low organic matter substratee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum – Glomus – Azospirillum association”
e3“For each substrate, Azospirillum counts per gram of root were significantly (p < 0.05) higher in mycorrhizal roots at all harvests than in P-fertilized roots, and also higher in the high peat substrate compared with the low organic matter substrate”
Claim · model-written summary
The ratio of inoculated A. brasilense cells in Glomus-colonized to P-fertilized roots was positively and significantly correlated with percent VAM colonization.
- Treatment
- % VAM colonizatione4
- Interactor
- A. brasilenseAzospirillum brasilensee4symbiont
- Outcome
- ratio of the total number of inoculated A. brasilense cellse4
- Direction
- positivelye4
- Value
- r = 0.81e4
GlomusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum – Glomus – Azospirillum association”
e4“The ratio of the total number of inoculated A. brasilense cells in the Glomus-colonized compared to the P-fertilized roots was positively and significantly correlated (r = 0.81; p < 0.05) with % VAM colonization”
Claim · model-written summary
Colonization of sorghum roots by Glomus etunicatum enhanced establishment and persistence of Azospirillum brasilense in the endorhizosphere.
- Treatment
- Colonization of sorghum roots by G. etunicatume5
- Interactor
- A. brasilenseAzospirillum brasilensee5symbiont
- Second interactor
- G. etunicatume5symbiont
- Outcome
- establishment and persistence of A. brasilensee5
- Direction
- enhancede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum – Glomus – Azospirillum association”
e5“Colonization of sorghum roots by G. etunicatum thus enhanced the establishment and persistence of A. brasilense in the endorhizosphere of sorghum”
The same questions in other papers
mycorrhiza · growth · SorghumResults differ
5 papers in the same direction as this paper · 17 reporting no difference from an alternative
- negative
- positive
- positive
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- positive
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- positive
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See all 76 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.