Abstract
Common beans are a staple food in many developing countries. However, changes in global precipitation patterns, particularly short droughts during the rainy season, have affected crop production because nodulation is greatly affected by water shortages. Plant growth-promoting bacteria, together with humic substances, can alleviate the negative effects of soil stresses, including drought. This work aimed to evaluate the effects of co-inoculations of rhizobia and Herbaspirillum seropedicae in the presence of humic acid-like substances isolated from vermicompost on the recovery of common beans after a controlled water stress. Two independent experiments were conducted in a greenhouse using Phaseolus vulgaris cv. Grafite and cv. Bonus, which originated in Brazil and Mozambique, respectively. The soil humidity was maintained at field capacity in pots, and the water suppression was induced at the pre-flowering stage. After 12 days, the water was restored, and the beans were evaluated. In the first experiment with ‘Grafite’ beans, the relative water content of the foliar disks was significantly higher in the co-inoculated treatment, as were the numbers and masses of nodules. The phenylalanine ammonia lyase activity was induced by drought, and its activity was higher in co-inoculated plant leaves. In the second experiment, the rate of net photosynthesis and stomatal conductance were also evaluated. The recuperation of common beans after water stress was improved by co-inoculation with rhizobia and H. seropedicae in the presence of humic acid-like substances. The relative water content increased (RWC%) with co-inoculation.
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Claims 6
Claim · model-written summary
Co-inoculated Grafite beans had higher leaf relative water content.
- Taxon
- common beans
Phaseolus vulgarist0 - Treatment
- co-inoculated treatmente0
- Outcome
- relative water content of the foliar diskse0
- Direction
- highere0
Not reportedMaterialComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“relative water content of the foliar disks was significantly higher in the co-inoculated treatment”
t0“common beans”
Claim · model-written summary
Co-inoculated Grafite beans had more and heavier nodules.
- Taxon
- common beansPhaseolus vulgarist0
- Treatment
- co-inoculatione1
- Outcome
- numbers and masses of nodulese0
- Direction
- higherinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as were the numbers and masses of nodules”
e1“The relative water content increased (RWC%) with co-inoculation”
t0“common beans”
Claim · model-written summary
Drought induced leaf phenylalanine ammonia lyase activity.
- Taxon
- common beansPhaseolus vulgarist0
- Treatment
- droughte0
- Outcome
- phenylalanine ammonia lyase activitye0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The phenylalanine ammonia lyase activity was induced by drought”
t0“common beans”
Claim · model-written summary
Co-inoculated leaves had higher phenylalanine ammonia lyase activity.
- Taxon
- common beansPhaseolus vulgarist0
- Treatment
- co-inoculatede0
- Outcome
- activitye0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its activity was higher in co-inoculated plant leaves”
t0“common beans”
Claim · model-written summary
Co-inoculation with rhizobia and H. seropedicae plus humic substances improved recovery.
- Taxon
- common beansPhaseolus vulgarise0
- Treatment
- co-inoculation with rhizobia and H. seropedicae in the presence of humic acid-like substancese0
- Interactor
- rhizobiae0symbiont
- Second interactor
- H. seropedicaeHerbaspirillum seropedicaee0symbiont
- Outcome
- recuperation of common beans after water stresse0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“recuperation of common beans after water stress was improved by co-inoculation with rhizobia and H. seropedicae in the presence of humic acid-like substances”
Claim · model-written summary
Co-inoculation increased relative water content.
- Taxon
- common beansPhaseolus vulgarist0
- Treatment
- co-inoculatione0
- Outcome
- relative water contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative water content increased (RWC%) with co-inoculation”
t0“common beans”
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