Abstract
Gamma-aminobutyric acid (GABA) may play a positive role in regulating plant tolerance to drought or heat stress. The objectives of this study were to investigate the physiological effects of GABA on tolerance of creeping bentgrass (Agrostis stolonifera) to heat and drought stress and to determine whether enhanced heat and drought tolerance due to GABA treatment was associated with the up-regulation of selected genes and transcriptional factors involved in stress protection. Creeping bentgrass (cultivar “Penncross”) plants were treated with 0.5 mM GABA or water (untreated control) as a foliar spray and were subsequently exposed to heat stress (35/30 °C, day/night), drought stress by withholding irrigation, or non-stress conditions in controlled-environment growth chambers. Exogenous application of GABA significantly improved plant tolerance to heat and drought stress, as reflected by increased leaf water content, cell membrane stability, and chlorophyll content. The analysis of gene transcript level revealed that exogenous GABA up-regulated the expression of ABF3, POD, APX, HSP90, DHN3, and MT1 during heat stress and the expression of CDPK26, MAPK1, ABF3, WRKY75, MYB13, HSP70, MT1, 14-3-3, and genes (SOD, CAT, POD, APX, MDHAR, DHAR, and GR) encoding antioxidant enzymes during drought stress. The up-regulation of the aforementioned stress-protective genes and transcriptional factors could contribute to improved heat and drought tolerance in creeping bentgrass.
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Claims 5
Claim · model-written summary
GABA increased leaf water content, membrane stability and chlorophyll under heat stress.
- Taxon
- creeping bentgrass (Agrostis stolonifera)
Agrostis stoloniferae1 - Treatment
- GABAe0
- Outcome
- leaf water content, cell membrane stability, and chlorophyll contente0
- Direction
- increasede0
- Qualifier
- heat stress (35/30 °C, day/night)e3
- Comparator
- water (untreated control)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous application of GABA significantly improved plant tolerance to heat and drought stress, as reflected by increased leaf water content, cell membrane stability, and chlorophyll content”
e1“creeping bentgrass (Agrostis stolonifera)”
e2“water (untreated control)”
e3“heat stress (35/30 °C, day/night)”
Claim · model-written summary
GABA increased leaf water content, membrane stability and chlorophyll under drought stress.
- Taxon
- creeping bentgrass (Agrostis stolonifera)Agrostis stoloniferae1
- Treatment
- GABAe0
- Outcome
- leaf water content, cell membrane stability, and chlorophyll contente0
- Direction
- increasede0
- Qualifier
- drought stress by withholding irrigatione3
- Comparator
- water (untreated control)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous application of GABA significantly improved plant tolerance to heat and drought stress, as reflected by increased leaf water content, cell membrane stability, and chlorophyll content”
e1“creeping bentgrass (Agrostis stolonifera)”
e2“water (untreated control)”
e3“drought stress by withholding irrigation”
Claim · model-written summary
GABA up-regulated ABF3, POD and APX expression during heat stress.
- Taxon
- creeping bentgrass (Agrostis stolonifera)Agrostis stoloniferae1
- Treatment
- exogenous GABAe0
- Gene
- ABF3, POD, APXe0
- Outcome
- expression of ABF3, POD, APXe0
- Direction
- up-regulatede0
- Qualifier
- heat stresse0
- Comparator
- water (untreated control)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous GABA up-regulated the expression of ABF3, POD, APX, HSP90, DHN3, and MT1 during heat stress”
e1“creeping bentgrass (Agrostis stolonifera)”
e2“water (untreated control)”
Claim · model-written summary
GABA up-regulated HSP90, DHN3 and MT1 expression during heat stress.
- Taxon
- creeping bentgrass (Agrostis stolonifera)Agrostis stoloniferae1
- Treatment
- exogenous GABAe0
- Gene
- HSP90, DHN3, and MT1e0
- Outcome
- expressione0
- Direction
- up-regulatede0
- Qualifier
- heat stresse0
- Comparator
- water (untreated control)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous GABA up-regulated the expression of ABF3, POD, APX, HSP90, DHN3, and MT1 during heat stress”
e1“creeping bentgrass (Agrostis stolonifera)”
e2“water (untreated control)”
Claim · model-written summary
Authors suggest up-regulated stress-protective genes could contribute to heat and drought tolerance.
- Taxon
- creeping bentgrassAgrostis stoloniferae0
- Outcome
- improved heat and drought tolerancee0
- Qualifier
- up-regulation of the aforementioned stress-protective genes and transcriptional factorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The up-regulation of the aforementioned stress-protective genes and transcriptional factors could contribute to improved heat and drought tolerance in creeping bentgrass”
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