Abstract
The purpose of this study was to test the hypothesis that vesicular arbuscular mycorrhizal (VAM) fungi affect net assimilation of CO(2) (A) of different-aged citrus leaves independent of mineral nutrition effects of mycorrhizae. Citrus aurantium L., sour orange plants were grown for 6 months in a sandy soil low in phosphorus that was either infested with the VAM fungus, Glomus intraradices Schenck & Smith, or fertilized with additional phosphorus and left nonmycorrhizal (NM). Net CO(2) assimilation, stomatal conductance, water use efficiency, and mineral nutrient status for expanding, recently expanded, and mature leaves were evaluated as well as plant size and relative growth rate of leaves. Nutrient status and net gas exchange varied with leaf age. G. intraradices-inoculated plants had well-established colonization (79% of root length) and were comparable in relative growth rate and size at final harvest with NM plants. Leaf mineral concentrations were generally the same for VAM and NM plants except for nitrogen. Although leaf nitrogen was apparently sufficient for high rates of A, VAM plants did have higher nitrogen concentrations than NM at the time of gas exchange measurements. G. intraradices had no effect on A, stomatal conductance, or water use efficiency, irrespective of leaf age. These results show that well-established VAM colonization does not affect net gas exchange of citrus plants that are comparable in size, growth rate, and nutritional status with NM plants.
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Claims 4
Claim · model-written summary
Glomus intraradices had no effect on net CO2 assimilation, stomatal conductance or water use efficiency in sour orange, irrespective of leaf age.
- Taxon
- Citrus aurantium
Citrus ×aurantiume0 - Treatment
- G. intraradicese1
- Interactor
- G. intraradicesRhizophagus intraradicese1symbiont
- Outcome
- A, stomatal conductance, or water use efficiencye1
- Direction
- no effecte1
- Comparator
- nonmycorrhizal (NM)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Citrus aurantium L., sour orange plants were grown for 6 months in a sandy soil low in phosphorus that was either infested with the VAM fungus, Glomus intraradices Schenck & Smith, or fertilized with additional phosphorus and left nonmycorrhizal (NM)”
e1“G. intraradices had no effect on A, stomatal conductance, or water use efficiency, irrespective of leaf age”
Claim · model-written summary
VAM plants had higher leaf nitrogen concentrations than nonmycorrhizal plants at the time of gas exchange measurements.
- Taxon
- Citrus aurantiumCitrus ×aurantiume0
- Treatment
- G. intraradices-inoculatede2
- Interactor
- G. intraradicesRhizophagus intraradicese2symbiont
- Outcome
- nitrogen concentrationse3
- Direction
- highere3
- Comparator
- NMe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Citrus aurantium L., sour orange plants were grown for 6 months in a sandy soil low in phosphorus that was either infested with the VAM fungus, Glomus intraradices Schenck & Smith, or fertilized with additional phosphorus and left nonmycorrhizal (NM)”
e2“G. intraradices-inoculated plants had well-established colonization (79% of root length) and were comparable in relative growth rate and size at final harvest with NM plants”
e3“VAM plants did have higher nitrogen concentrations than NM at the time of gas exchange measurements”
Claim · model-written summary
Leaf mineral concentrations were generally the same in VAM and NM plants, except for nitrogen.
- Taxon
- Citrus aurantiumCitrus ×aurantiume0
- Treatment
- VAMe4
- Interactor
- VAMe4symbiont
- Outcome
- Leaf mineral concentrationse4
- Direction
- generally the samee4
- Qualifier
- except for nitrogene4
- Comparator
- NM plantse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Citrus aurantium L., sour orange plants were grown for 6 months in a sandy soil low in phosphorus that was either infested with the VAM fungus, Glomus intraradices Schenck & Smith, or fertilized with additional phosphorus and left nonmycorrhizal (NM)”
e4“Leaf mineral concentrations were generally the same for VAM and NM plants except for nitrogen”
Claim · model-written summary
G. intraradices-inoculated sour orange plants were comparable to NM plants in relative growth rate and size at final harvest.
- Taxon
- Citrus aurantiumCitrus ×aurantiume0
- Treatment
- G. intraradices-inoculatede2
- Interactor
- G. intraradicesRhizophagus intraradicese2symbiont
- Outcome
- relative growth rate and size at final harveste2
- Direction
- comparablee2
- Comparator
- NM plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Citrus aurantium L., sour orange plants were grown for 6 months in a sandy soil low in phosphorus that was either infested with the VAM fungus, Glomus intraradices Schenck & Smith, or fertilized with additional phosphorus and left nonmycorrhizal (NM)”
e2“G. intraradices-inoculated plants had well-established colonization (79% of root length) and were comparable in relative growth rate and size at final harvest with NM plants”
The same questions in other papers
mycorrhiza · nutrient: content · Citrus x aurantium (sour orange)Positive and negative results
2 in the opposite direction
- positive
- positive
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.