Abstract
To investigate the involvement of Rhizobium etli cbb(3) oxidase in the response of Phaseolus vulgaris to drought, common bean plants were inoculated with the R. etli strain, CFNX713, overexpressing this oxidase in bacteroids (cbb(3)(+)) and subjected to drought conditions. The negative effect of drought on plant and nodule dryweight, nitrogen content, and nodule functionality was more pronounced in plants inoculated with the wild-type (WT) strain than in those inoculated with the cbb(3)(+) strain. Regardless of the plant treatment, bacteroids produced by the cbb(3)(+) strain showed higher respiratory capacity than those produced by the WT strain. Inoculation of plants with the cbb(3)(+) strain alleviated the negative effect of a moderate drought on the respiratory capacity of bacteroids and the energy charge of the nodules. Expression of the FixP and FixO components of the cbb(3) oxidase was higher in bacteroids of the cbb(3)(+) strain than in those of the WT strain under all experimental conditions. The decline in sucrose synthase activity and the decrease in dicarboxylic acids provoked by moderate drought stress were more pronounced in nodules from plants inoculated with the WT strain than in those inoculated with the cbb(3)(+) strain. Taken together, these results suggest that inoculation of plants with a R. etli strain having enhanced expression of cbb(3) oxidase in bacteroids reduces the sensitivity of P. vulgaris-R. etli symbiosis to drought and can modulate carbon metabolism in nodules.
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Claims 8
Claim · model-written summary
Drought reductions in plant and nodule dryweight and nitrogen content were more pronounced with WT than cbb(3)(+) inoculation.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarise1 - Treatment
- droughte0
- Interactor
- R. etliRhizobium etlie2symbiont
- Outcome
- plant and nodule dryweight, nitrogen contente0
- Direction
- more pronouncede0
- Qualifier
- plants inoculated with the wild-type (WT) straine0
- Comparator
- cbb(3)(+) straine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The negative effect of drought on plant and nodule dryweight, nitrogen content, and nodule functionality was more pronounced in plants inoculated with the wild-type (WT) strain than in those inoculated with the cbb(3)(+) strain.”
e1“response of Phaseolus vulgaris to drought”
e2“plants were inoculated with the R. etli strain”
Claim · model-written summary
Drought effects on nodule functionality were more pronounced with WT than cbb(3)(+) inoculation.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise1
- Treatment
- droughte0
- Interactor
- R. etliRhizobium etlie2symbiont
- Outcome
- nodule functionalitye0
- Direction
- more pronouncede0
- Comparator
- cbb(3)(+) straine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The negative effect of drought on plant and nodule dryweight, nitrogen content, and nodule functionality was more pronounced in plants inoculated with the wild-type (WT) strain than in those inoculated with the cbb(3)(+) strain.”
e1“response of Phaseolus vulgaris to drought”
e2“plants were inoculated with the R. etli strain”
Claim · model-written summary
cbb(3)(+) bacteroids had higher respiratory capacity than WT bacteroids regardless of plant treatment.
Verbatim
e0“Regardless of the plant treatment, bacteroids produced by the cbb(3)(+) strain showed higher respiratory capacity than those produced by the WT strain.”
e1“plants were inoculated with the R. etli strain”
Claim · model-written summary
cbb(3)(+) inoculation alleviated moderate drought effects on bacteroid respiration and nodule energy charge.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise1
- Treatment
- Inoculation of plants with the cbb(3)(+) straine0
- Interactor
- R. etliRhizobium etlie2symbiont
- Outcome
- respiratory capacity of bacteroids and the energy charge of the nodulese0
- Direction
- alleviatede0
- Qualifier
- moderate droughte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation of plants with the cbb(3)(+) strain alleviated the negative effect of a moderate drought on the respiratory capacity of bacteroids and the energy charge of the nodules.”
e1“response of Phaseolus vulgaris to drought”
e2“plants were inoculated with the R. etli strain”
Claim · model-written summary
FixP and FixO expression was higher in cbb(3)(+) than WT bacteroids under all conditions.
Verbatim
e0“Expression of the FixP and FixO components of the cbb(3) oxidase was higher in bacteroids of the cbb(3)(+) strain than in those of the WT strain under all experimental conditions.”
e1“plants were inoculated with the R. etli strain”
Claim · model-written summary
Moderate drought caused a more pronounced decline in sucrose synthase activity with WT than cbb(3)(+) inoculation.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise1
- Organ / stage
- nodulese0
- Treatment
- moderate drought stresse0
- Interactor
- R. etliRhizobium etlie2symbiont
- Outcome
- sucrose synthase activitye0
- Direction
- declinee0
- Comparator
- cbb(3)(+) straine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decline in sucrose synthase activity and the decrease in dicarboxylic acids provoked by moderate drought stress were more pronounced in nodules from plants inoculated with the WT strain than in those inoculated with the cbb(3)(+) strain.”
e1“response of Phaseolus vulgaris to drought”
e2“plants were inoculated with the R. etli strain”
Claim · model-written summary
Moderate drought caused a more pronounced decrease in nodule dicarboxylic acids with WT than cbb(3)(+) inoculation.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise1
- Organ / stage
- nodulese0
- Treatment
- moderate drought stresse0
- Interactor
- R. etliRhizobium etlie2symbiont
- Outcome
- dicarboxylic acidse0
- Direction
- decreasee0
- Comparator
- cbb(3)(+) straine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decline in sucrose synthase activity and the decrease in dicarboxylic acids provoked by moderate drought stress were more pronounced in nodules from plants inoculated with the WT strain than in those inoculated with the cbb(3)(+) strain.”
e1“response of Phaseolus vulgaris to drought”
e2“plants were inoculated with the R. etli strain”
Claim · model-written summary
The authors interpret enhanced rhizobial cbb(3) expression as reducing symbiotic drought sensitivity and modulating nodule carbon metabolism.
- Taxon
- P. vulgarisPhaseolus vulgarise0
- Treatment
- inoculation of plants with a R. etli strain having enhanced expression of cbb(3) oxidase in bacteroidse0
- Interactor
- R. etliRhizobium etlie0symbiont
- Outcome
- sensitivity of P. vulgaris-R. etli symbiosis to droughte0
- Direction
- reducese0
- Qualifier
- can modulate carbon metabolism in nodulese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inoculation of plants with a R. etli strain having enhanced expression of cbb(3) oxidase in bacteroids reduces the sensitivity of P. vulgaris-R. etli symbiosis to drought and can modulate carbon metabolism in nodules”
The same questions in other papers
inoculation · Rhizobium etli · Phaseolus vulgaris (common bean)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
2 papers more in this group
See all 6 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.