Abstract
Studies on Rhizobium-legume symbiosis show that trehalose content in nodules under drought stress correlates positively with an increase in plant tolerance to this stress. Fewer reports describe trehalose accumulation in mycorrhiza where, in contrast with rhizobia, there is no flux of carbohydrates from the microsymbiont to the plant. However, the trehalose dynamics in the Mycorrhiza-Rhizobium-Legume tripartite symbiosis is unknown. The present study explores the role of this tripartite symbiosis in the trehalose content of nodules grown under contrasting moisture conditions. Three wild genotypes (P. filiformis, P. acutifolis and P. vulgaris) and two commercial genotypes of Phaseolus vulgaris (Pinto villa and Flor de Mayo) were used. Co-inoculation treatments were conducted with Glomus intraradices and a mixture of seven native rhizobial strains, and trehalose content was determined by GC/MS. The results showed a negative effect of mycorrhizal inoculation on nodule development, as mycorrhized plants showed fewer nodules and lower nodule dry weight compared to plants inoculated only with Rhizobium. Mycorrhizal colonization was also higher in plants inoculated only with Glomus as compared to plants co-inoculated with both microsymbionts. In regard to trehalose, co-inoculation negatively affects its accumulation in the nodules of each genotype tested. However, the correlation analysis showed a significantly positive correlation between mycorrhizal colonization and nodule trehalose content.
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Claims 4
Claim · model-written summary
Mycorrhizal inoculation reduced nodule number and dry weight relative to Rhizobium alone.
- Taxon
- Beant0
- Treatment
- mycorrhizede0
- Outcome
- nodules and lower nodule dry weighte0
- Direction
- fewere0
- Comparator
- plants inoculated only with Rhizobiume0
RhizobiumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mycorrhized plants showed fewer nodules and lower nodule dry weight compared to plants inoculated only with Rhizobium.”
t0“Bean”
Claim · model-written summary
Glomus alone produced higher mycorrhizal colonization than co-inoculation.
- Taxon
- Beant0
- Treatment
- plants inoculated only with Glomuse0
- Outcome
- Mycorrhizal colonizatione0
- Direction
- highere0
- Comparator
- plants co-inoculated with both microsymbiontse0
GlomusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mycorrhizal colonization was also higher in plants inoculated only with Glomus as compared to plants co-inoculated with both microsymbionts.”
t0“Bean”
Claim · model-written summary
Co-inoculation reduced nodule trehalose accumulation in every tested genotype.
- Taxon
- Beant0
- Treatment
- co-inoculatione0
- Interactor
- Glomus intraradicesRhizophagus intraradicese1symbiont
- Outcome
- accumulation in the nodulese0
- Direction
- negatively affectse0
Not reportedComparator
Verbatim
e0“co-inoculation negatively affects its accumulation in the nodules of each genotype tested.”
t0“Bean”
e1“Co-inoculation treatments were conducted with Glomus intraradices and a mixture of seven native rhizobial strains”
Claim · model-written summary
Mycorrhizal colonization correlated positively with nodule trehalose content.
Verbatim
e0“a significantly positive correlation between mycorrhizal colonization and nodule trehalose content.”
t0“Bean”
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inoculation · Rhizophagus intraradices · Phaseolus vulgaris (common bean)Positive and negative results
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inoculation · disease · Phaseolus vulgaris (common bean)Positive and negative results
27 papers in the same direction as this paper · 39 in the opposite direction · 1 reporting no difference from an alternative
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See all 68 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.