Abstract
Heat stress-induced or stress-accelerated leaf senescence is related to the accumulation of ethylene and loss of chlorophyll in cool-season grass species. The objective of this study was to determine whether foliar-spraying the ethylene inhibitor, aminoethoxyvinylglycine (AVG), may suppress heat-induced leaf senescence through effects on chlorophyll synthesis and degrading enzymes in creeping bentgrass ( Agrostis stolonifera ). Plants were maintained in environmentally controlled growth chambers under non-stress (22/17 °C day/night) or heat stress (35/30 °C day/night) temperature conditions for 25 days, and turf quality, electrolyte leakage, and chlorophyll content were measured to assess the extent of leaf senescence. Activities of chlorophyll-synthesizing and chlorophyll-degrading enzymes were quantified to determine whether AVG may regulate chlorophyll metabolism. Plants were foliar-sprayed with 25 µ m AVG before and during heat stress at 7-day intervals. From 21 through 25 days of heat stress, AVG-treated plants had significantly higher turf quality and chlorophyll content, whereas electrolyte leakage was significantly lower in comparison with untreated controls. The activity of a chlorophyll-synthesizing enzyme, porphobilinogen deaminase, was significantly increased in AVG-treated plants at 21 days of heat stress. The activity of chlorophyll-degrading enzymes was significantly lower in plants treated with AVG from 14 through 25 days of heat stress for peroxidase, from 21 through 25 days of heat stress for pheophytinase, and at 25 days of heat stress for chlorophyllase. AVG may have suppressed heat-induced leaf senescence by regulating chlorophyll metabolic activities in cool-season grass species.
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Claims 7
Claim · model-written summary
AVG-sprayed creeping bentgrass under heat stress had higher turf quality and chlorophyll content than untreated controls from 21 to 25 days.
- Taxon
- Creeping Bentgrass
Agrostis stoloniferat0 - Treatment
- foliar-sprayed with 25 µ m AVGe2
- Outcome
- turf quality and chlorophyll contente1
- Direction
- highere1
- Qualifier
- From 21 through 25 days of heat stresse1
- Comparator
- untreated controlse1
- Setting
- environmentally controlled growth chamberse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Creeping Bentgrass”
e1“From 21 through 25 days of heat stress, AVG-treated plants had significantly higher turf quality and chlorophyll content, whereas electrolyte leakage was significantly lower in comparison with untreated controls”
e2“Plants were foliar-sprayed with 25 µ m AVG before and during heat stress at 7-day intervals”
e3“Plants were maintained in environmentally controlled growth chambers under non-stress (22/17 °C day/night) or heat stress (35/30 °C day/night) temperature conditions for 25 days”
Claim · model-written summary
AVG-sprayed creeping bentgrass under heat stress had lower electrolyte leakage than untreated controls from 21 to 25 days.
- Taxon
- Creeping BentgrassAgrostis stoloniferat0
- Treatment
- foliar-sprayed with 25 µ m AVGe2
- Outcome
- electrolyte leakagee1
- Direction
- lowere1
- Qualifier
- From 21 through 25 days of heat stresse1
- Comparator
- untreated controlse1
- Setting
- environmentally controlled growth chamberse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Creeping Bentgrass”
e1“From 21 through 25 days of heat stress, AVG-treated plants had significantly higher turf quality and chlorophyll content, whereas electrolyte leakage was significantly lower in comparison with untreated controls”
e2“Plants were foliar-sprayed with 25 µ m AVG before and during heat stress at 7-day intervals”
e3“Plants were maintained in environmentally controlled growth chambers under non-stress (22/17 °C day/night) or heat stress (35/30 °C day/night) temperature conditions for 25 days”
Claim · model-written summary
AVG increased porphobilinogen deaminase activity in creeping bentgrass at 21 days of heat stress.
- Taxon
- Creeping BentgrassAgrostis stoloniferat0
- Treatment
- AVGe4
- Gene
- porphobilinogen deaminasee4
- Outcome
- activitye4
- Direction
- increasede4
- Qualifier
- at 21 days of heat stresse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Creeping Bentgrass”
e4“The activity of a chlorophyll-synthesizing enzyme, porphobilinogen deaminase, was significantly increased in AVG-treated plants at 21 days of heat stress”
Claim · model-written summary
AVG lowered peroxidase activity in creeping bentgrass from 14 through 25 days of heat stress.
- Taxon
- Creeping BentgrassAgrostis stoloniferat0
- Treatment
- AVGe5
- Gene
- peroxidasee5
- Outcome
- activitye5
- Direction
- lowere5
- Qualifier
- from 14 through 25 days of heat stresse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Creeping Bentgrass”
e5“The activity of chlorophyll-degrading enzymes was significantly lower in plants treated with AVG from 14 through 25 days of heat stress for peroxidase, from 21 through 25 days of heat stress for pheophytinase, and at 25 days of heat stress for chlorophyllase”
Claim · model-written summary
AVG lowered pheophytinase activity in creeping bentgrass from 21 through 25 days of heat stress.
- Taxon
- Creeping BentgrassAgrostis stoloniferat0
- Treatment
- AVGe5
- Gene
- pheophytinasee5
- Outcome
- activitye5
- Direction
- lowere5
- Qualifier
- from 21 through 25 days of heat stresse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Creeping Bentgrass”
e5“The activity of chlorophyll-degrading enzymes was significantly lower in plants treated with AVG from 14 through 25 days of heat stress for peroxidase, from 21 through 25 days of heat stress for pheophytinase, and at 25 days of heat stress for chlorophyllase”
Claim · model-written summary
AVG lowered chlorophyllase activity in creeping bentgrass at 25 days of heat stress.
- Taxon
- Creeping BentgrassAgrostis stoloniferat0
- Treatment
- AVGe5
- Gene
- chlorophyllasee5
- Outcome
- activitye5
- Direction
- lowere5
- Qualifier
- at 25 days of heat stresse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Creeping Bentgrass”
e5“The activity of chlorophyll-degrading enzymes was significantly lower in plants treated with AVG from 14 through 25 days of heat stress for peroxidase, from 21 through 25 days of heat stress for pheophytinase, and at 25 days of heat stress for chlorophyllase”
Claim · model-written summary
AVG may suppress heat-induced leaf senescence in creeping bentgrass by regulating chlorophyll metabolic activities.
- Taxon
- Creeping BentgrassAgrostis stoloniferat0
- Treatment
- AVGe6
- Outcome
- heat-induced leaf senescencee6
- Qualifier
- by regulating chlorophyll metabolic activitiese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Creeping Bentgrass”
e6“AVG may have suppressed heat-induced leaf senescence by regulating chlorophyll metabolic activities in cool-season grass species”
The same questions in other papers
application · physiology: oxidative · Agrostis stolonifera (creeping bent grass)Results agree
2 papers in the same direction as this paper
- positive
- positive
application · physiology: pigments · Agrostis stolonifera (creeping bent grass)Results agree
3 papers in the same direction as this paper
- positive
- 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.