Abstract
γ-Aminobutyric acid (GABA) is a non-protein amino acid with multifunctional roles in dynamic plant responses. To determine the effects of exogenous GABA application (0, 25 and 50 µM) on drought response, two chickpea cultivars with contrasting tolerance to water deficit were examined. Plants were exposed to four irrigation levels (irrigation to 100, 60, 40 and 20% field capacity). Water deficit decreased growth, chlorophyll content, and photosynthetic efficiency. It increased electrolyte leakage and lipid peroxidation owing to both higher ROS accumulation and lower antioxidant enzyme activity. These negative effects of water deficit and the alleviating role of GABA application were more prominent in the sensitive, as compared to the tolerant cultivar. Water deficit also increased proline and GABA contents more in the tolerant cultivar, whereas their content was more enhanced by GABA application in the sensitive one. This may confer an additional level of regulation that results in better alleviation of drought damage in tolerant chickpea cultivars. In conclusion, the stimulatory effect of GABA on growth and physiological modulation depends on both the water stress severity and the cultivar sensitivity to it, implying a probable unknown GABA-related mechanism established by tolerant chickpea cultivars; a lost or not gained mechanism in susceptible ones.
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Claims 8
Claim · model-written summary
Water deficit decreased chickpea growth, chlorophyll content, and photosynthetic efficiency.
- Taxon
- chickpea
Cicer arietinumt0 - Treatment
- Water deficite0
- Outcome
- growth, chlorophyll content, and photosynthetic efficiencye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water deficit decreased growth, chlorophyll content, and photosynthetic efficiency.”
t0“chickpea plants”
Claim · model-written summary
Water deficit increased electrolyte leakage and lipid peroxidation.
- Taxon
- chickpeaCicer arietinumt0
- Treatment
- Water deficite1
- Outcome
- electrolyte leakage and lipid peroxidatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It increased electrolyte leakage and lipid peroxidation owing to both higher ROS accumulation and lower antioxidant enzyme activity.”
e1“Water deficit decreased growth”
t0“chickpea plants”
Claim · model-written summary
Water deficit raised ROS accumulation.
- Taxon
- chickpeaCicer arietinumt0
- Treatment
- Water deficite1
- Outcome
- ROS accumulatione0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher ROS accumulation”
e1“Water deficit decreased growth”
t0“chickpea plants”
Claim · model-written summary
Water deficit lowered antioxidant enzyme activity.
- Taxon
- chickpeaCicer arietinumt0
- Treatment
- Water deficite1
- Outcome
- antioxidant enzyme activitye0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower antioxidant enzyme activity”
e1“Water deficit decreased growth”
t0“chickpea plants”
Claim · model-written summary
Water deficit effects and GABA alleviation were more pronounced in the sensitive cultivar than the tolerant cultivar.
- Taxon
- chickpeaCicer arietinumt0
- Material
- sensitivee0
- Outcome
- negative effects of water deficit and the alleviating role of GABA applicatione0
- Direction
- more prominente0
- Comparator
- tolerant cultivare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These negative effects of water deficit and the alleviating role of GABA application were more prominent in the sensitive, as compared to the tolerant cultivar.”
t0“chickpea plants”
Claim · model-written summary
Water deficit increased proline and GABA contents more in the tolerant cultivar.
- Taxon
- chickpeaCicer arietinumt0
- Material
- tolerant cultivare0
- Treatment
- Water deficite0
- Outcome
- proline and GABA contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water deficit also increased proline and GABA contents more in the tolerant cultivar”
t0“chickpea plants”
Claim · model-written summary
GABA application enhanced proline and GABA contents more in the sensitive cultivar.
- Taxon
- chickpeaCicer arietinumt0
- Material
- sensitive onee0
- Treatment
- GABA applicatione0
- Outcome
- proline and GABA contentse1
- Direction
- more enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“their content was more enhanced by GABA application in the sensitive one.”
e1“proline and GABA contents”
t0“chickpea plants”
Claim · model-written summary
GABA stimulation of growth and physiology depended on water stress severity and cultivar sensitivity.
- Taxon
- chickpeaCicer arietinumt0
- Treatment
- GABAe0
- Outcome
- stimulatory effect of GABA on growth and physiological modulatione0
- Qualifier
- water stress severity and the cultivar sensitivitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the stimulatory effect of GABA on growth and physiological modulation depends on both the water stress severity and the cultivar sensitivity to it”
t0“chickpea plants”
The same questions in other papers
drought · physiology: photosynthesis · Cicer arietinum (chickpea)Results differ
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- positive
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14 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
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See all 19 papers →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.