Abstract
To investigate the effects of arbuscular mycorrhizal (AM) fungus (Glomus intraradices) colonization on drought-stress tolerance, leaf water potential, chlorophyll concentration, P content and carbohydrate composition were examined in perennial ryegrass (Lolium perenne L.) plants exposed to drought-stressed or well-watered conditions. Drought stress significantly decreased leaf water potential, P content and leaf growth. These drought-induced damages were moderated by mycorrhizal colonization. Drought stress decreased the concentration of soluble sugars in shoots. AM plants had a higher foliar soluble sugar than non-AM plants under drought stress condition. Drought stress depressed the accumulation of starch and fructan in shoots, but stimulated in roots. Under drought-stressed condition, starch concentration in roots was higher in non-AM plants than in AM plants. Fructan was the largest pool of carbohydrates, showing the highest initial concentration and the highest net increase for 28 days of treatment. Drought stress slightly decreased fructan concentration in shoots, but remarkably increased in roots. Under drought-stressed condition, fructan concentrations in non-AM and AM shoots at day 28 were 18.7% and 13.3% lower than the corresponding values measured at well-watered plants. However, in the roots, fructan accumulation caused by drought was lessen 13.6% by mycorrhizal colonization. The results obtained suggest that mycorrhizal colonization improves drought tolerance of the host plants by maintaining higher leaf water status and P status, and by retaining more foliar soluble sugars.
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Claims 14
Claim · model-written summary
Drought significantly decreased ryegrass leaf water potential, P content and leaf growth.
- Taxon
- perennial ryegrass
Lolium perennee1 - Treatment
- Drought stresse0
- Outcome
- leaf water potential, P content and leaf growthe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress significantly decreased leaf water potential, P content and leaf growth.”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
Mycorrhizal colonization moderated drought-induced damage in ryegrass.
- Taxon
- perennial ryegrassLolium perennee1
- Treatment
- mycorrhizal colonizatione0
- Interactor
- Glomus intraradicesRhizophagus intraradicese2symbiont
- Outcome
- drought-induced damagese0
- Direction
- moderatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These drought-induced damages were moderated by mycorrhizal colonization.”
e1“perennial ryegrass (Lolium perenne L.)”
e2“arbuscular mycorrhizal (AM) fungus (Glomus intraradices)”
Claim · model-written summary
Drought decreased soluble sugar concentration in ryegrass shoots.
- Taxon
- perennial ryegrassLolium perennee1
- Organ / stage
- shootse0
- Treatment
- Drought stresse0
- Outcome
- concentration of soluble sugarse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress decreased the concentration of soluble sugars in shoots.”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
Under drought, AM ryegrass had higher foliar soluble sugar than non-AM ryegrass.
- Taxon
- perennial ryegrassLolium perennee1
- Treatment
- AM plantse0
- Interactor
- Glomus intraradicesRhizophagus intraradicese2symbiont
- Outcome
- foliar soluble sugare0
- Direction
- highere0
- Qualifier
- drought stress conditione0
- Comparator
- non-AM plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AM plants had a higher foliar soluble sugar than non-AM plants under drought stress condition.”
e1“perennial ryegrass (Lolium perenne L.)”
e2“arbuscular mycorrhizal (AM) fungus (Glomus intraradices)”
Claim · model-written summary
Drought depressed starch and fructan accumulation in ryegrass shoots.
- Taxon
- perennial ryegrassLolium perennee1
- Organ / stage
- shootse0
- Treatment
- Drought stresse0
- Outcome
- accumulation of starch and fructane0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress depressed the accumulation of starch and fructan in shoots, but stimulated in roots.”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
Drought stimulated starch and fructan accumulation in ryegrass roots.
- Taxon
- perennial ryegrassLolium perennee1
- Organ / stage
- rootse0
- Treatment
- Drought stresse0
- Outcome
- accumulation of starch and fructane0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress depressed the accumulation of starch and fructan in shoots, but stimulated in roots.”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
Under drought, root starch was higher in non-AM than AM ryegrass.
- Taxon
- perennial ryegrassLolium perennee1
- Organ / stage
- rootse0
- Treatment
- non-AM plantse0
- Interactor
- Glomus intraradicesRhizophagus intraradicese2symbiont
- Outcome
- starch concentratione0
- Direction
- highere0
- Comparator
- AM plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under drought-stressed condition, starch concentration in roots was higher in non-AM plants than in AM plants.”
e1“perennial ryegrass (Lolium perenne L.)”
e2“arbuscular mycorrhizal (AM) fungus (Glomus intraradices)”
Claim · model-written summary
Fructan was the largest carbohydrate pool and had the highest initial concentration and net increase over 28 days.
- Taxon
- perennial ryegrassLolium perennee1
- Outcome
- Fructan was the largest pool of carbohydratese0
- Qualifier
- 28 days of treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fructan was the largest pool of carbohydrates, showing the highest initial concentration and the highest net increase for 28 days of treatment.”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
Drought slightly decreased shoot fructan concentration.
- Taxon
- perennial ryegrassLolium perennee1
- Organ / stage
- shootse0
- Treatment
- Drought stresse0
- Outcome
- fructan concentratione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress slightly decreased fructan concentration in shoots, but remarkably increased in roots.”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
Drought markedly increased root fructan concentration.
- Taxon
- perennial ryegrassLolium perennee1
- Organ / stage
- rootse0
- Treatment
- Drought stresse0
- Outcome
- fructan concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress slightly decreased fructan concentration in shoots, but remarkably increased in roots.”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
At day 28, shoot fructan in drought-stressed non-AM ryegrass was 18.7% below well-watered plants.
- Taxon
- perennial ryegrassLolium perennee1
- Organ / stage
- shootse0
- Treatment
- non-AMe0
- Outcome
- fructan concentrationse0
- Direction
- lowere0
- Value
- 18.7%e0
- Qualifier
- day 28e0
- Comparator
- well-watered plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fructan concentrations in non-AM and AM shoots at day 28 were 18.7% and 13.3% lower than the corresponding values measured at well-watered plants.”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
At day 28, shoot fructan in drought-stressed AM ryegrass was 13.3% below well-watered plants.
- Taxon
- perennial ryegrassLolium perennee1
- Organ / stage
- shootse0
- Treatment
- AM shootse0
- Interactor
- Glomus intraradicesRhizophagus intraradicese2symbiont
- Outcome
- fructan concentrationse0
- Direction
- lowere0
- Value
- 13.3%e0
- Qualifier
- day 28e0
- Comparator
- well-watered plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fructan concentrations in non-AM and AM shoots at day 28 were 18.7% and 13.3% lower than the corresponding values measured at well-watered plants.”
e1“perennial ryegrass (Lolium perenne L.)”
e2“arbuscular mycorrhizal (AM) fungus (Glomus intraradices)”
Claim · model-written summary
Mycorrhizal colonization lessened drought-induced root fructan accumulation by 13.6%.
- Taxon
- perennial ryegrassLolium perennee1
- Organ / stage
- rootse0
- Treatment
- mycorrhizal colonizatione0
- Interactor
- Glomus intraradicesRhizophagus intraradicese2symbiont
- Outcome
- fructan accumulatione0
- Direction
- lessene0
- Value
- 13.6%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the roots, fructan accumulation caused by drought was lessen 13.6% by mycorrhizal colonization.”
e1“perennial ryegrass (Lolium perenne L.)”
e2“arbuscular mycorrhizal (AM) fungus (Glomus intraradices)”
Claim · model-written summary
The authors suggest mycorrhizal colonization improves ryegrass drought tolerance by maintaining leaf water and P status and foliar soluble sugars.
- Taxon
- perennial ryegrassLolium perennee1
- Treatment
- mycorrhizal colonizatione0
- Interactor
- Glomus intraradicesRhizophagus intraradicese2symbiont
- Outcome
- drought tolerancee0
- Qualifier
- maintaining higher leaf water status and P status, and by retaining more foliar soluble sugarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mycorrhizal colonization improves drought tolerance of the host plants by maintaining higher leaf water status and P status, and by retaining more foliar soluble sugars.”
e1“perennial ryegrass (Lolium perenne L.)”
e2“arbuscular mycorrhizal (AM) fungus (Glomus intraradices)”
The same questions in other papers
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2 in the opposite direction
- positive
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drought · quality: sugar starch · Lolium perenne (perennial ryegrass)Positive and negative results
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drought · physiology: osmolytes · Lolium perenne (perennial ryegrass)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
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drought · physiology: water · Lolium perenne (perennial ryegrass)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
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1 paper more in this group
See all 5 papers →mycorrhiza · Rhizophagus intraradices · Lolium perenne (perennial ryegrass)Results agree
2 papers in the same direction as this paper
- 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.