Abstract
Abstract BACKGROUND The present study set out to evaluate the potential of plant growth‐promoting Actinobacteria (PGPB) in improving some physiological and molecular parameters of rapeseed ( Brassica napus L.) plants under ambient and elevated CO 2 conditions by assessing some nitrogen‐ and sulfur‐containing metabolites, antioxidant defense system and antimicrobial activity. With this aim, a pot experiment was conducted where the rapeseed plants were treated with Actinobacterium sp. strain NCO2 (OQ451136) and were grown under two levels of air CO 2 concentrations: ambient CO 2 (aCO 2 , 410 μmol CO 2 mol −1 ); and elevated CO 2 (eCO 2 , 710 μmol CO 2 mol −1 ). RESULTS There was an increase in the photosynthetic pigments (+35–80%) and photosynthesis rate (+20–34%) in PGPB‐treated plants under eCO 2 compared to control plants, resulting in further growth and biomass production (+53–294%). These results were associated with an enhancement in the content of total antioxidant capacity (+15–128%), polyphenols (+21–126%) and α ‐tocopherols (+20–138%) under both eCO 2 and PGPB application (in combination or individual application), while only the combined treatment (eCO 2 + PGPB) led to a significantly higher accumulation of antioxidant enzymes (+88–197%), β ‐tocopherols (+177%) and flavonoids (+155%). Moreover, nitrogen‐ and sulfur‐containing metabolites (glucosinolates and amino acids) were improved by PGPB treatment and/or CO 2 levels, in which PGPB increased the amino acid‐derived glucosinolate induction by eCO 2 with low levels of effective sulforaphane. CONCLUSIONS Therefore, the interaction effects of beneficial Actinobacteria and eCO 2 are expected to boost the level of antioxidant molecules and to have a helpful role in improving plant biomass and adaptability to complicated climate changes in the future. © 2023 Society of Chemical Industry.
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Claims 11
Claim · model-written summary
PGPB under elevated CO2 increased photosynthetic pigments by 35–80%.
Verbatim
e0“There was an increase in the photosynthetic pigments (+35–80%) and photosynthesis rate (+20–34%) in PGPB‐treated plants under eCO 2 compared to control plants, resulting in further growth and biomass production (+53–294%).”
e1“Actinobacterium sp. strain NCO2”
t0“rapeseed”
Claim · model-written summary
PGPB under elevated CO2 increased photosynthesis rate by 20–34%.
Verbatim
e0“There was an increase in the photosynthetic pigments (+35–80%) and photosynthesis rate (+20–34%) in PGPB‐treated plants under eCO 2 compared to control plants, resulting in further growth and biomass production (+53–294%).”
t0“rapeseed”
Claim · model-written summary
PGPB under elevated CO2 increased growth and biomass production by 53–294%.
Verbatim
e0“There was an increase in the photosynthetic pigments (+35–80%) and photosynthesis rate (+20–34%) in PGPB‐treated plants under eCO 2 compared to control plants, resulting in further growth and biomass production (+53–294%).”
t0“rapeseed”
Claim · model-written summary
Elevated CO2 and PGPB, separately or together, enhanced total antioxidant capacity by 15–128%.
- Taxon
- rapeseedt0
- Treatment
- eCO 2 and PGPB applicatione0
- Outcome
- total antioxidant capacitye0
- Direction
- enhancemente0
- Value
- +15–128%e0
- Qualifier
- in combination or individual applicatione0
Not reportedComparator
Verbatim
e0“an enhancement in the content of total antioxidant capacity (+15–128%), polyphenols (+21–126%) and α ‐tocopherols (+20–138%) under both eCO 2 and PGPB application (in combination or individual application)”
t0“rapeseed”
Claim · model-written summary
Elevated CO2 and PGPB, separately or together, enhanced polyphenols by 21–126%.
- Taxon
- rapeseedt0
- Treatment
- eCO 2 and PGPB applicatione0
- Outcome
- polyphenolse0
- Direction
- enhancemente0
- Value
- +21–126%e0
Not reportedComparator
Verbatim
e0“an enhancement in the content of total antioxidant capacity (+15–128%), polyphenols (+21–126%) and α ‐tocopherols (+20–138%) under both eCO 2 and PGPB application (in combination or individual application)”
t0“rapeseed”
Claim · model-written summary
Elevated CO2 and PGPB, separately or together, enhanced α-tocopherols by 20–138%.
- Taxon
- rapeseedt0
- Treatment
- eCO 2 and PGPB applicatione0
- Outcome
- α ‐tocopherolse0
- Direction
- enhancemente0
- Value
- +20–138%e0
Not reportedComparator
Verbatim
e0“an enhancement in the content of total antioxidant capacity (+15–128%), polyphenols (+21–126%) and α ‐tocopherols (+20–138%) under both eCO 2 and PGPB application (in combination or individual application)”
t0“rapeseed”
Claim · model-written summary
Combined elevated CO2 and PGPB significantly increased antioxidant enzymes by 88–197%.
- Taxon
- rapeseedt0
- Treatment
- combined treatment (eCO 2 + PGPB)e0
- Outcome
- antioxidant enzymese0
- Direction
- highere0
- Value
- +88–197%e0
Not reportedComparator
Verbatim
e0“only the combined treatment (eCO 2 + PGPB) led to a significantly higher accumulation of antioxidant enzymes (+88–197%), β ‐tocopherols (+177%) and flavonoids (+155%).”
t0“rapeseed”
Claim · model-written summary
Combined elevated CO2 and PGPB significantly increased β-tocopherols by 177%.
- Taxon
- rapeseedt0
- Treatment
- combined treatment (eCO 2 + PGPB)e0
- Outcome
- β ‐tocopherolse0
- Direction
- highere0
- Value
- +177%e0
Not reportedComparator
Verbatim
e0“only the combined treatment (eCO 2 + PGPB) led to a significantly higher accumulation of antioxidant enzymes (+88–197%), β ‐tocopherols (+177%) and flavonoids (+155%).”
t0“rapeseed”
Claim · model-written summary
Combined elevated CO2 and PGPB significantly increased flavonoids by 155%.
- Taxon
- rapeseedt0
- Treatment
- combined treatment (eCO 2 + PGPB)e0
- Outcome
- flavonoidse0
- Direction
- highere0
- Value
- +155%e0
Not reportedComparator
Verbatim
e0“only the combined treatment (eCO 2 + PGPB) led to a significantly higher accumulation of antioxidant enzymes (+88–197%), β ‐tocopherols (+177%) and flavonoids (+155%).”
t0“rapeseed”
Claim · model-written summary
PGPB treatment and/or CO2 levels improved glucosinolates and amino acids.
- Taxon
- rapeseedt0
- Treatment
- PGPB treatment and/or CO 2 levelse0
- Outcome
- glucosinolates and amino acidse0
- Direction
- improvede0
Not reportedComparator
Verbatim
e0“nitrogen‐ and sulfur‐containing metabolites (glucosinolates and amino acids) were improved by PGPB treatment and/or CO 2 levels”
t0“rapeseed”
Claim · model-written summary
PGPB increased induction of amino acid-derived glucosinolate by elevated CO2, with low effective sulforaphane.
- Taxon
- rapeseedt0
- Treatment
- PGPBe0
- Outcome
- amino acid‐derived glucosinolate inductione0
- Direction
- increasede0
- Qualifier
- low levels of effective sulforaphanee0
Not reportedComparator
Verbatim
e0“PGPB increased the amino acid‐derived glucosinolate induction by eCO 2 with low levels of effective sulforaphane.”
t0“rapeseed”
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See all 5 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.