Abstract
Abstract Abiotic stress, particularly drought, significantly reduces crop yields and threatens global agricultural sustainability. This study investigated drought and recovery responses in four plant species with contrasting photosynthetic types: Triticum aestivum (C3), Helianthus annuus (C3), Chenopodium album (intermediate-C4), and Alternanthera brasiliana (C4-like). Drought markedly reduced plant fresh biomass (up to 80% in H. annuus ) and relative water content, particularly in C. album . Oxidative damage intensified, with H. annuus showing the greatest increase in hydrogen peroxide (258%) and C. album exhibiting the highest malondialdehyde accumulation (284%). Antioxidant enzymes were strongly activated; catalase activity increased dramatically in C. album (837%) and H. annuus (630%). Proline levels increased sharply, particularly in T. aestivum and C. album , indicating enhanced osmotic adjustment. Carotenoid content also rose significantly in H. annuus (141%), suggesting photoprotective adaptation. Gene expression analysis revealed upregulation of TaP5CS in T. aestivum , correlating with proline accumulation, and CaHSP26 in C. album , potentially stabilizing photosystem II. Principal component analysis identified catalase activity, root-to-shoot ratio, hydrogen peroxide, and proline as major contributors to drought response variance. These findings highlight species-specific strategies for drought tolerance and recovery, with C3 species showing strong enzymatic and osmotic adjustments, and intermediate-C4 and C4-like species exhibiting greater tissue integrity and ROS balance. This comparative framework provides valuable insights for developing drought-resilient crops.
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Claims 14
Claim · model-written summary
Drought reduced fresh biomass by up to 80% in Helianthus annuus.
- Taxon
- H. annuus
Helianthus annuuse0 - Treatment
- Droughte0
- Outcome
- plant fresh biomasse0
- Direction
- reducede0
- Value
- 80%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought markedly reduced plant fresh biomass (up to 80% in H. annuus ) and relative water content, particularly in C. album”
Claim · model-written summary
Drought reduced relative water content, particularly in Chenopodium album.
- Taxon
- C. album
Chenopodium albume0 - Treatment
- Droughte0
- Outcome
- relative water contente0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought markedly reduced plant fresh biomass (up to 80% in H. annuus ) and relative water content, particularly in C. album”
Claim · model-written summary
Hydrogen peroxide increased most in H. annuus under drought, by 258%.
- Taxon
- H. annuusHelianthus annuuse1
- Treatment
- Droughte0
- Outcome
- hydrogen peroxidee1
- Direction
- greatest increasee1
- Value
- 258%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought markedly reduced”
e1“H. annuus showing the greatest increase in hydrogen peroxide (258%)”
Claim · model-written summary
Malondialdehyde accumulation was highest in C. album under drought, at 284%.
- Taxon
- C. albumChenopodium albume1
- Treatment
- Droughte0
- Outcome
- malondialdehyde accumulatione1
- Direction
- higheste1
- Value
- 284%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought markedly reduced”
e1“C. album exhibiting the highest malondialdehyde accumulation (284%)”
Claim · model-written summary
Catalase activity increased by 837% in C. album under drought.
- Taxon
- C. albumChenopodium albume1
- Treatment
- Droughte0
- Outcome
- catalase activitye1
- Direction
- increasede1
- Value
- 837%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought markedly reduced”
e1“catalase activity increased dramatically in C. album (837%) and H. annuus (630%)”
Claim · model-written summary
Catalase activity increased by 630% in H. annuus under drought.
- Taxon
- H. annuusHelianthus annuuse1
- Treatment
- Droughte0
- Outcome
- catalase activitye1
- Direction
- increasede1
- Value
- 630%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought markedly reduced”
e1“catalase activity increased dramatically in C. album (837%) and H. annuus (630%)”
Claim · model-written summary
Proline levels increased sharply under drought, particularly in T. aestivum, indicating enhanced osmotic adjustment.
- Taxon
- T. aestivum
Triticum aestivume1 - Treatment
- Droughte0
- Outcome
- Proline levelse1
- Direction
- increased sharplye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought markedly reduced”
e1“Proline levels increased sharply, particularly in T. aestivum and C. album”
Claim · model-written summary
Proline levels increased sharply under drought, particularly in C. album.
- Taxon
- C. albumChenopodium albume1
- Treatment
- Droughte0
- Outcome
- Proline levelse1
- Direction
- increased sharplye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought markedly reduced”
e1“Proline levels increased sharply, particularly in T. aestivum and C. album”
Claim · model-written summary
Carotenoid content rose significantly in H. annuus by 141% under drought.
- Taxon
- H. annuusHelianthus annuuse1
- Treatment
- Droughte0
- Outcome
- Carotenoid contente1
- Direction
- rosee1
- Value
- 141%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought markedly reduced”
e1“Carotenoid content also rose significantly in H. annuus (141%)”
Claim · model-written summary
TaP5CS was upregulated in T. aestivum under drought, correlating with proline accumulation.
- Taxon
- T. aestivumTriticum aestivume1
- Treatment
- Droughte0
- Gene
- TaP5CSe1
- Outcome
- upregulation of TaP5CSe1
- Direction
- upregulatione1
- Qualifier
- correlating with proline accumulatione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought markedly reduced”
e1“upregulation of TaP5CS in T. aestivum , correlating with proline accumulation”
Claim · model-written summary
CaHSP26 was upregulated in C. album under drought, potentially stabilizing photosystem II.
- Taxon
- C. albumChenopodium albume1
- Treatment
- Droughte0
- Gene
- CaHSP26e1
- Outcome
- CaHSP26e1
- Qualifier
- potentially stabilizing photosystem IIe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought markedly reduced”
e1“and CaHSP26 in C. album , potentially stabilizing photosystem II”
Claim · model-written summary
Principal component analysis identified catalase activity, root-to-shoot ratio, hydrogen peroxide and proline as major contributors to drought response variance.
- Outcome
- major contributors to drought response variancee0
Not reportedTaxon
Verbatim
e0“Principal component analysis identified catalase activity, root-to-shoot ratio, hydrogen peroxide, and proline as major contributors to drought response variance”
Claim · model-written summary
C3 species showed strong enzymatic and osmotic adjustments under drought.
Verbatim
e0“C3 species showing strong enzymatic and osmotic adjustments”
Claim · model-written summary
Intermediate-C4 and C4-like species showed greater tissue integrity and ROS balance under drought.
Verbatim
e0“intermediate-C4 and C4-like species exhibiting greater tissue integrity and ROS balance”
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8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.