Abstract
The purpose of this study was to determine if exogenous hormonecontaining products (HCP) (seaweed extract and humic acid) enhance endogenous antioxidant concentration in Kentucky bluegrass ( Poa pratensis L.) subjected to drought. Two‐week‐old seedlings of Kentucky bluegrass (cv. Plush) were treated with seaweed extract at 326 g ha −1 , humic acid (25% active) at 5 L ha −1 , alone or in combination, and grown under two soil moisture levels (−0.03 MPa and −0.5 MPa) for 5 wk, and subsequently analyzed for antioxidant concentration and growth. The HCP treatments improved leaf water status and enhanced shoot and root growth regardless of soil moisture levels. Water stress induced a significant increase of α‐tocopherol, ascorbic acid, and β‐carotene content but did not influence superoxide dismutase (SOD) activity. Foliar application of HCP significantly increased α‐tocopherol, ascorbic acid, β‐carotene content, and SOD activity, especially under low soil moisture (LSM). Positive correlations between antioxidants and antioxidants with growth parameters were observed in Kentucky bluegrass grown under either LSM or high soil moisture (HSM). These data indicate that HCP enhancement of the grass's endogenous antioxidant status may contribute to turfgrass drought tolerance.
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Claims 8
Claim · model-written summary
HCP improved leaf water status across soil moisture levels.
- Taxon
- Kentucky bluegrass
.jpg?width=60)
Poa pratensist0 - Treatment
- HCP treatmentse0
- Outcome
- leaf water statuse0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The HCP treatments improved leaf water status and enhanced shoot and root growth regardless of soil moisture levels.”
t0“Kentucky Bluegrass”
Claim · model-written summary
HCP enhanced shoot and root growth across soil moisture levels.
- Taxon
- Kentucky bluegrassPoa pratensist0
- Treatment
- HCP treatmentse0
- Outcome
- shoot and root growthe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The HCP treatments improved leaf water status and enhanced shoot and root growth regardless of soil moisture levels.”
t0“Kentucky Bluegrass”
Claim · model-written summary
Water stress significantly increased three antioxidant contents.
- Taxon
- Kentucky bluegrassPoa pratensist0
- Treatment
- Water stresse0
- Outcome
- α‐tocopherol, ascorbic acid, and β‐carotene contente0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress induced a significant increase of α‐tocopherol, ascorbic acid, and β‐carotene content but did not influence superoxide dismutase (SOD) activity.”
t0“Kentucky Bluegrass”
Claim · model-written summary
Water stress did not influence SOD activity.
- Taxon
- Kentucky bluegrassPoa pratensist0
- Treatment
- Water stresse0
- Outcome
- superoxide dismutase (SOD) activitye0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress induced a significant increase of α‐tocopherol, ascorbic acid, and β‐carotene content but did not influence superoxide dismutase (SOD) activity.”
t0“Kentucky Bluegrass”
Claim · model-written summary
Foliar HCP significantly increased antioxidant contents.
- Taxon
- Kentucky bluegrassPoa pratensist0
- Treatment
- Foliar application of HCPe0
- Outcome
- α‐tocopherol, ascorbic acid, β‐carotene contente0
- Direction
- increasede0
- Qualifier
- especially under low soil moisture (LSM)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar application of HCP significantly increased α‐tocopherol, ascorbic acid, β‐carotene content, and SOD activity, especially under low soil moisture (LSM).”
t0“Kentucky Bluegrass”
Claim · model-written summary
Foliar HCP significantly increased SOD activity.
- Taxon
- Kentucky bluegrassPoa pratensist0
- Treatment
- Foliar application of HCPe0
- Outcome
- SOD activitye0
- Direction
- increasede0
- Qualifier
- especially under low soil moisture (LSM)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar application of HCP significantly increased α‐tocopherol, ascorbic acid, β‐carotene content, and SOD activity, especially under low soil moisture (LSM).”
t0“Kentucky Bluegrass”
Claim · model-written summary
Antioxidants were positively correlated with one another.
- Taxon
- Kentucky bluegrassPoa pratensise0
- Outcome
- correlations between antioxidantse0
- Direction
- Positivee0
Not reportedOrgan / stage
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Positive correlations between antioxidants and antioxidants with growth parameters were observed in Kentucky bluegrass grown under either LSM or high soil moisture (HSM).”
Claim · model-written summary
Antioxidants were positively correlated with growth parameters.
- Taxon
- Kentucky bluegrassPoa pratensise0
- Outcome
- antioxidants with growth parameterse0
- Direction
- Positivee0
Not reportedOrgan / stage
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Positive correlations between antioxidants and antioxidants with growth parameters were observed in Kentucky bluegrass grown under either LSM or high soil moisture (HSM).”
The same questions in other papers
drought · physiology: antioxidant enzymes · Poa pratensis (Kentucky bluegrass)Positive and negative results
3 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →drought · quality: phytochemicals · Poa pratensis (Kentucky bluegrass)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.