Abstract
• The mechanisms by which the mycorrhizal symbiosis protects soybean ( Glycine max ) plants against premature nodule senescence induced by drought stress is investigated here by evaluating the activity of a set of antioxidant enzymes in relation to nodule senescence. • Superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) activity was determined in well watered or drought-stressed soybean plants inoculated with Bradyrrhizobium japonicum alone or in combination with Glomus mosseae . • In roots, only GR activity was higher in mycorrhizal than in non-mycorrhizal plants. The other antioxidant activities were similar, or lower (APX), in droughted, mycorrhizal plants than in the corresponding nonmycorrhizal ones. Similarly, in nodules, SOD, CAT and APX activities were lower in droughted, mycorrhizal plants than in nonmycorrhizal plants whereas, again, GR activity was higher in nodules from mycorrhizal plants. • We propose that the consistently higher GR activity in roots and nodules of mycorrhizal plants might have contributed to decreased oxidative damage to biomolecules, which are involved in premature nodule senescence. Additional drought-avoidance mechanisms induced by the AM symbiosis might also contribute to the lower oxidative stress in mycorrhizal plants.
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Claims 6
Claim · model-written summary
In roots of soybean, GR activity was higher in plants with Glomus mosseae than in non-mycorrhizal plants.
- Taxon
- Glycine max
Glycine maxe0 - Organ / stage
- rootse2
- Treatment
- in combination with Glomus mosseaee1
- Interactor
- Glomus mosseae
Funneliformis mosseaee1symbiont - Second interactor
- Bradyrrhizobium japonicume1symbiont
- Outcome
- GR activitye2
- Direction
- highere2
- Comparator
- non-mycorrhizal plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean ( Glycine max )”
e1“inoculated with Bradyrrhizobium japonicum alone or in combination with Glomus mosseae”
e2“In roots, only GR activity was higher in mycorrhizal than in non-mycorrhizal plants”
Claim · model-written summary
Under drought, the other antioxidant activities in roots were similar or lower in mycorrhizal than in nonmycorrhizal soybean plants.
- Taxon
- Glycine maxGlycine maxe0
- Organ / stage
- rootse2
- Treatment
- droughtede3
- Outcome
- other antioxidant activitiese3
- Direction
- similar, or lowere3
- Comparator
- the corresponding nonmycorrhizal onese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean ( Glycine max )”
e2“In roots, only GR activity was higher in mycorrhizal than in non-mycorrhizal plants”
e3“The other antioxidant activities were similar, or lower (APX), in droughted, mycorrhizal plants than in the corresponding nonmycorrhizal ones”
Claim · model-written summary
Under drought, SOD, CAT and APX activities in nodules were lower in mycorrhizal than in nonmycorrhizal soybean plants.
- Taxon
- Glycine maxGlycine maxe0
- Organ / stage
- nodulese4
- Treatment
- droughtede4
- Outcome
- SOD, CAT and APX activitiese4
- Direction
- lowere4
- Comparator
- nonmycorrhizal plantse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean ( Glycine max )”
e4“in nodules, SOD, CAT and APX activities were lower in droughted, mycorrhizal plants than in nonmycorrhizal plants”
Claim · model-written summary
GR activity was higher in nodules of mycorrhizal soybean plants.
- Taxon
- Glycine maxGlycine maxe0
- Organ / stage
- nodulese5
- Treatment
- mycorrhizale5
- Outcome
- GR activitye5
- Direction
- highere5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean ( Glycine max )”
e5“GR activity was higher in nodules from mycorrhizal plants”
Claim · model-written summary
Consistently higher GR activity in roots and nodules of mycorrhizal plants might decrease oxidative damage to biomolecules.
- Taxon
- Glycine maxGlycine maxe0
- Outcome
- decreased oxidative damage to biomoleculese6
- Qualifier
- consistently higher GR activity in roots and nodules of mycorrhizal plantse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean ( Glycine max )”
e6“the consistently higher GR activity in roots and nodules of mycorrhizal plants might have contributed to decreased oxidative damage to biomolecules”
Claim · model-written summary
Drought-avoidance mechanisms induced by the AM symbiosis might lower oxidative stress in mycorrhizal soybean plants.
- Taxon
- Glycine maxGlycine maxe0
- Outcome
- oxidative stresse7
- Qualifier
- drought-avoidance mechanisms induced by the AM symbiosise7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean ( Glycine max )”
e7“Additional drought-avoidance mechanisms induced by the AM symbiosis might also contribute to the lower oxidative stress in mycorrhizal plants”
The same questions in other papers
Funneliformis mosseae · physiology: antioxidant enzymes · Glycine max (soybean)Results agree
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- positive
drought · physiology: antioxidant enzymes · Glycine max (soybean)Results differ
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See all 24 papers →mycorrhiza · physiology: antioxidant enzymes · Glycine max (soybean)Results agree
4 papers in the same direction as this paper
- positive
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See all 5 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.