Abstract
Italian oregano (Origanumxmajoricum) was subjected to root system inoculation with three species of plant growth-promoting rhizobacteria (PGPRs) (Pseudomonas fluorescens, Bacillus subtilis, Azospirillum brasilense), and essential oil (EO) content and plant growth were measured. Composition of monoterpenes, a major EO component, was analyzed qualitative and quantitatively by gas chromatography. Total EO yield for plants inoculated with P. fluorescens or A. brasilense was 3.57 and 3.41 microg/mg fresh weight, respectively, approximately 2.5-fold higher than controls, without change of quantitative oil composition. The major EO compounds, cis- and trans-sabinene hydrate, gamma-terpinene, carvacrol, and thymol, showed increased biosynthesis. Carvacrol was the only terpene showing significant increase of R% in plants inoculated with A. brasilense. Plant growth parameters (shoot and root fresh and dry weights, numbers of leaves and nodes) were evaluated. Shoot fresh weight was significantly increased by all three PGPR species, but only P. fluorescens and A. brasilense increased root dry weight. These two species have clear commercial potential for economic cultivation of O.xmajoricum. Knowledge of the factors affecting yield and accumulation of monoterpenes is essential for improving production of these economically important plant compounds.
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Claims 9
Claim · model-written summary
P. fluorescens raised essential oil yield to 3.57 microg/mg fresh weight.
- Taxon
- plantsViridiplantaee0
- Treatment
- inoculated with P. fluorescense0
- Interactor
- P. fluorescens
.JPG?width=60)
Pseudomonas fluorescense0symbiont - Outcome
- Total EO yielde0
- Direction
- highere0
- Value
- 3.57e0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
e0“Total EO yield for plants inoculated with P. fluorescens or A. brasilense was 3.57 and 3.41 microg/mg fresh weight, respectively, approximately 2.5-fold higher than controls”
Claim · model-written summary
A. brasilense raised essential oil yield to 3.41 microg/mg fresh weight.
- Taxon
- plantsViridiplantaee0
- Treatment
- inoculated with P. fluorescens or A. brasilensee0
- Interactor
- A. brasilense
Azospirillum brasilensee0symbiont - Outcome
- Total EO yielde0
- Direction
- highere0
- Value
- 3.41 microg/mg fresh weighte0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total EO yield for plants inoculated with P. fluorescens or A. brasilense was 3.57 and 3.41 microg/mg fresh weight, respectively, approximately 2.5-fold higher than controls”
Claim · model-written summary
Inoculation did not alter quantitative oil composition.
- Taxon
- Origanum × majoricum
Origanum ×majoricumt0 - Outcome
- quantitative oil compositione0
- Direction
- without changee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“without change of quantitative oil composition”
t0“Origanum × majoricum”
Claim · model-written summary
Major essential oil compounds showed increased biosynthesis.
- Taxon
- Origanum × majoricumOriganum ×majoricumt0
- Outcome
- cis- and trans-sabinene hydrate, gamma-terpinene, carvacrol, and thymole0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The major EO compounds, cis- and trans-sabinene hydrate, gamma-terpinene, carvacrol, and thymol, showed increased biosynthesis”
t0“Origanum × majoricum”
Claim · model-written summary
Carvacrol R% increased significantly after A. brasilense inoculation.
- Taxon
- plantsViridiplantaee0
- Treatment
- inoculated with A. brasilensee0
- Interactor
- A. brasilenseAzospirillum brasilensee0symbiont
- Outcome
- Carvacrole0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carvacrol was the only terpene showing significant increase of R% in plants inoculated with A. brasilense”
Claim · model-written summary
All three rhizobacterial species increased shoot fresh weight.
- Taxon
- Origanum × majoricumOriganum ×majoricumt0
- Treatment
- all three PGPR speciese0
- Outcome
- Shoot fresh weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot fresh weight was significantly increased by all three PGPR species”
t0“Origanum × majoricum”
Claim · model-written summary
P. fluorescens increased root dry weight.
- Taxon
- Origanum × majoricumOriganum ×majoricumt0
- Treatment
- P. fluorescense0
- Interactor
- P. fluorescensPseudomonas fluorescense0symbiont
- Outcome
- root dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only P. fluorescens and A. brasilense increased root dry weight”
t0“Origanum × majoricum”
Claim · model-written summary
A. brasilense increased root dry weight.
- Taxon
- Origanum × majoricumOriganum ×majoricumt0
- Treatment
- A. brasilensee0
- Interactor
- A. brasilenseAzospirillum brasilensee0symbiont
- Outcome
- root dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only P. fluorescens and A. brasilense increased root dry weight”
t0“Origanum × majoricum”
Claim · model-written summary
The two rhizobacterial species have commercial potential for oregano cultivation.
- Taxon
- O.xmajoricumOriganum ×majoricume0
- Outcome
- commercial potential for economic cultivatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These two species have clear commercial potential for economic cultivation of O.xmajoricum”
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See all 12 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.