Abstract
Zirconium (Zr) is one of the toxic metals that are heavily incorporated into the ecosystem due to intensive human activities. Their accumulation in the ecosystem disrupts the food chain, causing undesired alterations. Despite Zr’s phytotoxicity, its impact on plant growth and redox status remains unclear, particularly if combined with elevated CO2 (eCO2). Therefore, a greenhouse pot experiment was conducted to test the hypothesis that eCO2 can alleviate the phytotoxic impact of Zr upon oat (Avena sativa) plants by enhancing their growth and redox homeostasis. A complete randomized block experimental design (CRBD) was applied to test our hypothesis. Generally, contamination with Zr strikingly diminished the biomass and photosynthetic efficiency of oat plants. Accordingly, contamination with Zr triggered remarkable oxidative damage in oat plants, with concomitant alteration in the antioxidant defense system of oat plants. Contrarily, elevated levels of CO2 (eCO2) significantly mitigated the adverse effect of Zr upon both fresh and dry weights as well as the photosynthesis of oat plants. The improved photosynthesis consequently quenched the oxidative damage caused by Zr by reducing the levels of both H2O2 and MDA. Moreover, eCO2 augmented the total antioxidant capacity with the concomitant accumulation of molecular antioxidants (e.g., polyphenols, flavonoids). In addition, eCO2 not only improved the activities of antioxidant enzymes such as peroxidase (POX), superoxide dismutase (SOD) and catalase (CAT) but also boosted the ASC/GSH metabolic pool that plays a pivotal role in regulating redox homeostasis in plant cells. In this regard, our research offers a novel perspective by delving into the previously unexplored realm of the alleviative effects of eCO2. It sheds light on how eCO2 distinctively mitigates oxidative stress induced by Zr, achieving this by orchestrating adjustments to the redox balance within oat plants.
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Claims 9
Claim · model-written summary
Zr contamination diminished oat biomass and photosynthetic efficiency.
- Taxon
- oat
Avena sativae0 - Treatment
- contamination with Zre0
- Outcome
- biomass and photosynthetic efficiencye0
- Direction
- diminishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“contamination with Zr strikingly diminished the biomass and photosynthetic efficiency of oat plants”
Claim · model-written summary
Zr contamination caused oxidative damage and altered antioxidant defense in oat.
- Taxon
- oatAvena sativae0
- Treatment
- contamination with Zre0
- Outcome
- oxidative damagee0
- Direction
- triggerede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“contamination with Zr triggered remarkable oxidative damage in oat plants, with concomitant alteration in the antioxidant defense system of oat plants”
Claim · model-written summary
Elevated CO2 mitigated the effects of Zr on oat fresh and dry weights.
- Taxon
- oatAvena sativae0
- Treatment
- elevated levels of CO2 (eCO2)e0
- Outcome
- fresh and dry weightse0
- Direction
- mitigatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated levels of CO2 (eCO2) significantly mitigated the adverse effect of Zr upon both fresh and dry weights as well as the photosynthesis of oat plants”
Claim · model-written summary
Elevated CO2 mitigated the adverse effect of Zr on oat photosynthesis.
- Taxon
- oatAvena sativae0
- Treatment
- elevated levels of CO2 (eCO2)e0
- Outcome
- photosynthesise0
- Direction
- mitigatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated levels of CO2 (eCO2) significantly mitigated the adverse effect of Zr upon both fresh and dry weights as well as the photosynthesis of oat plants”
Claim · model-written summary
Improved photosynthesis reduced oat H2O2 levels under Zr exposure.
- Taxon
- Avena sativaAvena sativat0
- Outcome
- levels of both H2O2 and MDAe0
- Direction
- reducinge0
- Qualifier
- improved photosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“improved photosynthesis consequently quenched the oxidative damage caused by Zr by reducing the levels of both H2O2 and MDA”
t0“Avena sativa”
Claim · model-written summary
Elevated CO2 increased total antioxidant capacity in oat.
- Taxon
- Avena sativaAvena sativat0
- Treatment
- eCO2e0
- Outcome
- total antioxidant capacitye0
- Direction
- augmentede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“eCO2 augmented the total antioxidant capacity with the concomitant accumulation of molecular antioxidants (e.g., polyphenols, flavonoids)”
t0“Avena sativa”
Claim · model-written summary
Elevated CO2 increased polyphenol and flavonoid accumulation.
- Taxon
- Avena sativaAvena sativat0
- Treatment
- eCO2e0
- Outcome
- accumulation of molecular antioxidants (e.g., polyphenols, flavonoids)e0
- Direction
- accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“eCO2 augmented the total antioxidant capacity with the concomitant accumulation of molecular antioxidants (e.g., polyphenols, flavonoids)”
t0“Avena sativa”
Claim · model-written summary
Elevated CO2 improved peroxidase, superoxide dismutase and catalase activities.
- Taxon
- Avena sativaAvena sativat0
- Treatment
- eCO2e0
- Outcome
- activities of antioxidant enzymes such as peroxidase (POX), superoxide dismutase (SOD) and catalase (CAT)e0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“eCO2 not only improved the activities of antioxidant enzymes such as peroxidase (POX), superoxide dismutase (SOD) and catalase (CAT)”
t0“Avena sativa”
Claim · model-written summary
Elevated CO2 increased the ASC/GSH metabolic pool.
- Taxon
- Avena sativaAvena sativat0
- Treatment
- eCO2e0
- Outcome
- ASC/GSH metabolic poole0
- Direction
- boostede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“eCO2 not only improved the activities of antioxidant enzymes such as peroxidase (POX), superoxide dismutase (SOD) and catalase (CAT) but also boosted the ASC/GSH metabolic pool”
t0“Avena sativa”
The same questions in other papers
co2 · growth · Avena sativa (oats)Positive and negative results
4 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
3 papers more in this group
See all 7 papers →co2 · molecular: metabolites · Avena sativa (oats)Results agree
1 paper in the same direction as this paper
- positive
co2 · quality: phytochemicals · Avena sativa (oats)Results agree
1 paper in the same direction as this paper
- positive
co2 · physiology: photosynthesis · Avena sativa (oats)Results agree
1 paper in the same direction as this paper
- positive
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.