Abstract
Drought continues to be a major limiting factor for creeping bentgrass ( Agrostis palustris Huds. A.) quality and persistence on golf course fairways, greens, and tees. Little breeding specifically aimed at improving bentgrass drought resistance has been completed. However, a number of reports indicate that treatment with natural products such as seaweed extracts and humic acids improve cool‐season grass drought resistance possibly by hormonal up‐regulation of plant defense systems against oxidative stress. This study was conducted to determine the response of exogenous natural product treatment of three creeping bentgrass cultivars subjected to drought. ‘Penn G‐2’, ‘L‐93’, and ‘Penncross’ creeping bentgrass were treated with seaweed extract (SWE) at 0.5 kg ha −1 , humic acid (HA; 80% a.i.) at 1.5 kg ha −1 , alone or in combination, and maintained in a greenhouse at approximately field capacity (−0.01 MPa) or allowed to dry until near the permanent wilting point (−1.5 MPa). Unashed samples of SWE and HA contained 66 μg g −1 and 57 μg g −1 zeatin riboside (ZR), respectively, while ashed samples contained no detectable cytokinins as determined by enzyme‐linked immunosorbent assay (ELISA). There were no significant differences between cultivars in response to drought, except for ZR concentration, which was higher in Penn G‐2 than in L‐93 or Penncross foliage. Turf quality and photochemical efficiency began to decline 14 d into the dry‐down for the control and at 21 d in the natural product‐treated bentgrass. The combination of HA + SWE enhanced root mass (21–68%), and foliar α‐tocopherol (110%) and ZR (38%) contents. This is the first known report indicating that these natural products contain cytokinins and that their application resulted in increased endogenous cytokinin levels, possibly leading to improved creeping bentgrass drought resistance.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Unashed SWE contained 66 μg g −1 zeatin riboside.
Not reportedTaxon
Verbatim
e0“Unashed samples of SWE and HA contained 66 μg g −1 and 57 μg g −1 zeatin riboside (ZR), respectively”
Claim · model-written summary
Unashed HA contained 57 μg g −1 zeatin riboside.
Not reportedTaxon
Verbatim
e0“Unashed samples of SWE and HA contained 66 μg g −1 and 57 μg g −1 zeatin riboside (ZR), respectively”
Claim · model-written summary
Ashed samples had no detectable cytokinins.
- Outcome
- no detectable cytokininse0
Not reportedTaxonDirection
Verbatim
e0“ashed samples contained no detectable cytokinins”
Claim · model-written summary
Penn G‐2 had higher foliar ZR than L‐93 or Penncross.
- Taxon
- creeping bentgrass
Agrostis stoloniferat0 - Material
- Penn G‐2e0
- Organ / stage
- foliagee0
- Outcome
- ZR concentratione0
- Direction
- highere0
- Comparator
- L‐93 or Penncrosse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ZR concentration, which was higher in Penn G‐2 than in L‐93 or Penncross foliage”
t0“Creeping Bentgrass”
Claim · model-written summary
Turf quality began declining at day 14 in controls and day 21 with natural products.
Verbatim
e0“Turf quality and photochemical efficiency began to decline 14 d into the dry‐down for the control and at 21 d in the natural product‐treated bentgrass”
Claim · model-written summary
HA + SWE increased root mass by 21–68%.
- Taxon
- creeping bentgrassAgrostis stoloniferat0
- Treatment
- HA + SWEe0
- Outcome
- root masse0
- Direction
- enhancede0
- Value
- 21–68%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combination of HA + SWE enhanced root mass (21–68%), and foliar α‐tocopherol (110%) and ZR (38%) contents”
t0“Creeping Bentgrass”
Claim · model-written summary
HA + SWE increased foliar α‐tocopherol by 110%.
- Taxon
- creeping bentgrassAgrostis stoloniferat0
- Treatment
- HA + SWEe0
- Outcome
- foliar α‐tocopherole0
- Direction
- enhancede0
- Value
- 110%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combination of HA + SWE enhanced root mass (21–68%), and foliar α‐tocopherol (110%) and ZR (38%) contents”
t0“Creeping Bentgrass”
Claim · model-written summary
HA + SWE increased foliar ZR by 38%.
- Taxon
- creeping bentgrassAgrostis stoloniferat0
- Treatment
- HA + SWEe0
- Outcome
- ZRe0
- Direction
- enhancede0
- Value
- 38%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combination of HA + SWE enhanced root mass (21–68%), and foliar α‐tocopherol (110%) and ZR (38%) contents”
t0“Creeping Bentgrass”
The same questions in other papers
other · growth · Agrostis stolonifera (creeping bent grass)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →other · molecular: metabolites · Agrostis stolonifera (creeping bent grass)Results agree
2 papers in the same direction as this paper
- positive
- 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.