Abstract
Several studies have shown the benefits of plant growth-promoting rhizobacteria (PGPR) on plant mineral nutrition, suggesting their possible application as biofertilizers. PGPR can stimulate plant growth, increase plant resistance to abiotic and biotic stresses and might thus have a positive effect on fruit quality. The aim of this research was to evaluate and compare the effects of beneficial microorganisms, supplied either as pure culture (Azospirillum brasilense) or as a commercial mixture (Effective Microorganisms – EM™), on the growth and quality of strawberry (Fragaria ananassa ‘Elsanta’) fruits. Strawberry frigo-plants were hydroponically grown either in a complete nutrient solution, or in a nutrient solution inoculated with A. brasilense or with EM for 10 weeks. At harvest, biometric parameters, such as shoot and root fresh weights, and yield parameters, like number of fruits plant-1 and fruit weight, were recorded. Growth parameters (e.g., biomass, leaf area) were not affected by the rhizobacteria. Even though PGPR-inoculated plants showed slightly reduced fruit yields in terms of average number of fruits plant-1, they delivered larger fruits as compared to untreated control. Fruits obtained from PGPR-inoculated plants also had a higher sweetness index in comparison to control fruits. The content of total phenols showed no significant difference between the different samples, whereas the concentration of flavonoids and flavonols was higher in fruits harvested from A. brasilense-inoculated plants. In addition, PGPRs also influenced the uptake and allocation of nutrients in fruits, in particular increasing the concentration of micronutrients. © 2018 International Society for Horticultural Science. All rights reserved.
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Claims 7
Claim · model-written summary
Rhizobacterial inoculation did not affect strawberry biomass or leaf area.
- Taxon
- strawberry
_single2.jpg?width=60)
Fragaria ×ananassae1 - Treatment
- rhizobacteriae0
- Outcome
- biomass, leaf areae0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
e0“Growth parameters (e.g., biomass, leaf area) were not affected by the rhizobacteria”
e1“strawberry (Fragaria ananassa ‘Elsanta’)”
Claim · model-written summary
PGPR inoculation slightly reduced average fruit number per plant.
- Taxon
- strawberryFragaria ×ananassae1
- Treatment
- PGPR-inoculatede0
- Outcome
- average number of fruits plant-1e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PGPR-inoculated plants showed slightly reduced fruit yields in terms of average number of fruits plant-1”
e1“strawberry (Fragaria ananassa ‘Elsanta’)”
Claim · model-written summary
PGPR inoculation produced larger fruits than the untreated control.
- Taxon
- strawberryFragaria ×ananassae1
- Treatment
- PGPR-inoculatede2
- Outcome
- larger fruitse0
- Direction
- largere0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they delivered larger fruits as compared to untreated control”
e1“strawberry (Fragaria ananassa ‘Elsanta’)”
e2“Even though PGPR-inoculated plants”
Claim · model-written summary
Fruits of PGPR-inoculated plants had a higher sweetness index than controls.
Not reportedTaxon
Verbatim
e0“Fruits obtained from PGPR-inoculated plants also had a higher sweetness index in comparison to control fruits”
Claim · model-written summary
Total phenol content did not differ significantly among samples.
Not reportedTaxon
Verbatim
e0“The content of total phenols showed no significant difference between the different samples”
Claim · model-written summary
A. brasilense inoculation raised fruit flavonoids and flavonols.
- Taxon
- strawberryFragaria ×ananassae1
- Treatment
- A. brasilense-inoculatede0
- Interactor
- A. brasilense
Azospirillum brasilensee0symbiont - Outcome
- concentration of flavonoids and flavonolse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration of flavonoids and flavonols was higher in fruits harvested from A. brasilense-inoculated plants”
e1“strawberry (Fragaria ananassa ‘Elsanta’)”
Claim · model-written summary
PGPR inoculation increased fruit micronutrient concentration.
- Taxon
- strawberryFragaria ×ananassae1
- Treatment
- PGPRse0
- Outcome
- concentration of micronutrientse0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PGPRs also influenced the uptake and allocation of nutrients in fruits, in particular increasing the concentration of micronutrients”
e1“strawberry (Fragaria ananassa ‘Elsanta’)”
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