Abstract
S ummary Roots and soils from western Nebraska fields of native and planted grasslands, and winter wheat of varied fallow‐wheat cultivation duration, were evaluated for vesicular–arbuscular (VA) mycorrhizal root infection and spore numbers and types. Increased cultivation decreased percentage mycorrhizal infection in wheat and reduced spore numbers of Glomus fasciculatus , the dominant VA mycorrhizal fungus in these soils. Spore numbers of other VA mycorrhizal fungi did not change significantly with cultivation although mean numbers of G. mosseae increased with continued wheat production. Water relations and growth were determined for greenhouse‐grown non‐raycorrhizal, G. fasciculatus ‐infected, and G. mosseae ‐infected wheat in wet and dry soils. Stomatal conductances were higher in mycorrhizal than in non‐mycorrhizal plants in both wet and dry treatments. Stomatal closure in‐mycorrhizal plants occurred at lower leaf water potentials (Ψ 1 ) and after greater desiccation than in non‐mycorrhizal plants, but some leaves of G. mosseae‐infected plants showed no stomatal response to drought and continued to transpire at Ψ as low as ‐4.1 MPa. Leaf osmotic adjustment was greatest for G. fasciculatus ‐infected plants. Non‐mycorrhizal and G. fasciculatus‐infected plants had equal dry wts in both wet and dry conditions. Infection by G. fasciculatus appeared to increase wheat drought tolerance while infection by G. mosseae did not.
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Claims 11
Claim · model-written summary
Increased wheat cultivation decreased the percentage of mycorrhizal infection in wheat.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- Increased cultivatione1
- Outcome
- percentage mycorrhizal infectione1
- Direction
- decreasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Increased cultivation decreased percentage mycorrhizal infection in wheat”
Claim · model-written summary
Increased cultivation reduced spore numbers of Glomus fasciculatus.
- Taxon
- winter wheatTriticum aestivumt0
- Interactor
- Glomus fasciculatuse2symbiont
- Outcome
- spore numbers of Glomus fasciculatuse2
- Direction
- reducede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WINTER WHEAT”
e2“reduced spore numbers of Glomus fasciculatus”
Claim · model-written summary
Mean numbers of Glomus mosseae spores increased with continued wheat production.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- continued wheat productione3
- Interactor
- G. mosseae
Funneliformis mosseaee3symbiont - Outcome
- mean numbers of G. mosseaee3
- Direction
- increasede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WINTER WHEAT”
e3“mean numbers of G. mosseae increased with continued wheat production”
Claim · model-written summary
Spore numbers of other VA mycorrhizal fungi did not change significantly with cultivation.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- cultivatione4
- Interactor
- other VA mycorrhizal fungie4symbiont
- Outcome
- Spore numbers of other VA mycorrhizal fungie4
- Direction
- did not changee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WINTER WHEAT”
e4“Spore numbers of other VA mycorrhizal fungi did not change significantly with cultivation”
Claim · model-written summary
Stomatal conductance was higher in mycorrhizal than in non-mycorrhizal wheat plants in both wet and dry treatments.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- mycorrhizale5
- Outcome
- Stomatal conductancese5
- Direction
- highere5
- Qualifier
- in both wet and dry treatmentse5
- Comparator
- non‐mycorrhizal plantse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WINTER WHEAT”
e5“Stomatal conductances were higher in mycorrhizal than in non‐mycorrhizal plants in both wet and dry treatments”
Claim · model-written summary
Stomatal closure in mycorrhizal wheat occurred at lower leaf water potentials and after greater desiccation than in non-mycorrhizal plants.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- mycorrhizale6
- Outcome
- leaf water potentialse6
- Direction
- lowere6
- Qualifier
- after greater desiccatione7
- Comparator
- non‐mycorrhizal plantse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WINTER WHEAT”
e6“Stomatal closure in‐mycorrhizal plants occurred at lower leaf water potentials”
e7“after greater desiccation than in non‐mycorrhizal plants”
Claim · model-written summary
Some leaves of Glomus mosseae-infected wheat showed no stomatal response to drought and kept transpiring at a leaf water potential as low as -4.1 MPa.
- Taxon
- winter wheatTriticum aestivumt0
- Interactor
- G. mosseaeFunneliformis mosseaee1symbiont
- Outcome
- stomatal response to droughte1
- Value
- ‐4.1 MPae1
- Qualifier
- continued to transpiree1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WINTER WHEAT”
e1“but some leaves of G. mosseae‐infected plants showed no stomatal response to drought and continued to transpire at Ψ as low as ‐4.1 MPa”
Claim · model-written summary
Leaf osmotic adjustment was greatest in Glomus fasciculatus-infected wheat.
- Taxon
- winter wheatTriticum aestivumt0
- Interactor
- G. fasciculatuse1symbiont
- Outcome
- Leaf osmotic adjustmente1
- Direction
- greateste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WINTER WHEAT”
e1“Leaf osmotic adjustment was greatest for G. fasciculatus‐infected plants”
Claim · model-written summary
Non-mycorrhizal and Glomus fasciculatus-infected wheat had equal dry weights in both wet and dry conditions.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- G. fasciculatuse1
- Interactor
- G. fasciculatuse1symbiont
- Outcome
- dry wtse1
- Direction
- equale1
- Qualifier
- in both wet and dry conditionse1
- Comparator
- Non‐mycorrhizale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WINTER WHEAT”
e1“Non‐mycorrhizal and G. fasciculatus‐infected plants had equal dry wts in both wet and dry conditions”
Claim · model-written summary
Infection by Glomus fasciculatus appeared to increase wheat drought tolerance.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- Infection by G. fasciculatuse1
- Interactor
- G. fasciculatuse1symbiont
- Outcome
- wheat drought tolerancee1
- Direction
- increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WINTER WHEAT”
e1“Infection by G. fasciculatus appeared to increase wheat drought tolerance while infection by G. mosseae did not”
Claim · model-written summary
Infection by Glomus mosseae did not increase wheat drought tolerance.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- infection by G. mosseaee1
- Interactor
- G. mosseaeFunneliformis mosseaee1symbiont
- Outcome
- drought tolerancee1
- Direction
- did note1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WINTER WHEAT”
e1“Infection by G. fasciculatus appeared to increase wheat drought tolerance while infection by G. mosseae did not”
The same questions in other papers
infection · tolerance: abiotic · Triticum aestivum (wheat)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- 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.