Abstract
Gamma-aminobutyric acid (GABA) is important in plant responses to environmental stresses. We wished to clarify the role of GABA in maintenance of photosynthesis in muskmelon seedlings (Cucumis melo L., cv. Yipintianxia) during saline-alkaline stress. To this end, we assessed the effect of GABA on the structure and function of the photosynthetic apparatus in muskmelon seedlings grown under saline-alkaline stress. These stresses in combination reduced net photosynthetic rate, gas-exchange, and inhibited photosystem II (PSII) electron transport as measured by the JIP-test. They also reduced the activity of chloroplast ATPases and disrupted the internal lamellar system of the thylakoids. Exogenous GABA alleviated the stress-induced reduction of net photosynthesis, the activity of chloroplast ATPases, and overcame some of the damaging effects of stress on the chloroplast structure. Based on interpretation of the JIP-test, we conclude that exogenous GABA alleviated stress-related damage on the acceptor side of PSII. It also restored energy distribution, the reaction center status, and enhanced the ability of PSII to repair reaction centers in stressed seedlings. GABA may play a crucial role in protecting the chloroplast structure and function of PSII against the deleterious effects of salinity-alkalinity stress.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. 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 10
Claim · model-written summary
Combined saline-alkaline stresses reduced net photosynthetic rate and gas exchange in muskmelon.
- Taxon
- muskmelon
.jpg?width=60)
Cucumis meloe1 - Material
- cv. Yipintianxiae1
- Treatment
- saline-alkaline stresse2
- Outcome
- net photosynthetic rate, gas-exchangee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“These stresses in combination reduced net photosynthetic rate, gas-exchange”
e1“muskmelon seedlings (Cucumis melo L., cv. Yipintianxia)”
e2“seedlings grown under saline-alkaline stress”
Claim · model-written summary
Combined stresses inhibited PSII electron transport.
- Taxon
- muskmelonCucumis meloe1
- Treatment
- saline-alkaline stresse2
- Outcome
- photosystem II (PSII) electron transporte0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibited photosystem II (PSII) electron transport”
e1“photosynthesis in muskmelon seedlings (Cucumis melo L., cv. Yipintianxia)”
e2“seedlings grown under saline-alkaline stress”
Claim · model-written summary
Combined stresses reduced chloroplast ATPase activity.
- Taxon
- muskmelonCucumis meloe1
- Treatment
- saline-alkaline stresse2
- Gene
- chloroplast ATPasese0
- Outcome
- activity of chloroplast ATPasese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“They also reduced the activity of chloroplast ATPases”
e1“photosynthesis in muskmelon seedlings (Cucumis melo L., cv. Yipintianxia)”
e2“seedlings grown under saline-alkaline stress”
Claim · model-written summary
Combined stresses disrupted the thylakoid internal lamellar system.
- Taxon
- muskmelonCucumis meloe1
- Treatment
- saline-alkaline stresse2
- Outcome
- internal lamellar system of the thylakoidse0
- Direction
- disruptede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“disrupted the internal lamellar system of the thylakoids”
e1“photosynthesis in muskmelon seedlings (Cucumis melo L., cv. Yipintianxia)”
e2“seedlings grown under saline-alkaline stress”
Claim · model-written summary
Exogenous GABA alleviated the stress-induced reduction in net photosynthesis.
- Taxon
- muskmelonCucumis meloe1
- Treatment
- Exogenous GABAe0
- Outcome
- net photosynthesise0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous GABA alleviated the stress-induced reduction of net photosynthesis”
e1“photosynthesis in muskmelon seedlings (Cucumis melo L., cv. Yipintianxia)”
Claim · model-written summary
Exogenous GABA alleviated the stress-induced reduction of chloroplast ATPase activity.
- Taxon
- muskmelonCucumis meloe1
- Treatment
- Exogenous GABAe0
- Outcome
- activity of chloroplast ATPasese0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous GABA alleviated the stress-induced reduction of net photosynthesis, the activity of chloroplast ATPases”
e1“photosynthesis in muskmelon seedlings (Cucumis melo L., cv. Yipintianxia)”
Claim · model-written summary
Exogenous GABA overcame some stress damage to chloroplast structure.
- Taxon
- muskmelonCucumis meloe1
- Treatment
- Exogenous GABAe0
- Outcome
- chloroplast structuree0
- Direction
- overcamee0
- Qualifier
- some of the damaging effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous GABA alleviated the stress-induced reduction of net photosynthesis, the activity of chloroplast ATPases, and overcame some of the damaging effects of stress on the chloroplast structure”
e1“photosynthesis in muskmelon seedlings (Cucumis melo L., cv. Yipintianxia)”
Claim · model-written summary
The JIP-test suggested GABA alleviated damage to the PSII acceptor side.
- Taxon
- muskmelonCucumis meloe1
- Treatment
- exogenous GABAe0
- Outcome
- stress-related damage on the acceptor side of PSIIe0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous GABA alleviated stress-related damage on the acceptor side of PSII”
e1“photosynthesis in muskmelon seedlings (Cucumis melo L., cv. Yipintianxia)”
Claim · model-written summary
GABA restored energy distribution and reaction center status in stressed seedlings.
- Taxon
- muskmelonCucumis meloe2
- Treatment
- exogenous GABAe1
- Outcome
- energy distribution, the reaction center statuse0
- Direction
- restorede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It also restored energy distribution, the reaction center status”
e1“exogenous GABA”
e2“photosynthesis in muskmelon seedlings (Cucumis melo L., cv. Yipintianxia)”
Claim · model-written summary
GABA enhanced PSII repair of reaction centers in stressed seedlings.
- Taxon
- muskmelonCucumis meloe2
- Treatment
- exogenous GABAe1
- Outcome
- ability of PSII to repair reaction centerse0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“enhanced the ability of PSII to repair reaction centers in stressed seedlings”
e1“exogenous GABA”
e2“photosynthesis in muskmelon seedlings (Cucumis melo L., cv. Yipintianxia)”
The same questions in other papers
gamma-aminobutyric acid · physiology: photosynthesis · Cucumis melo (muskmelon)Results agree
1 paper in the same direction as this paper
- positive
salinity · physiology: photosynthesis · Cucumis melo (muskmelon)Results agree
5 papers in the same direction as this paper
- negative
- negative
- negative
2 papers more in this group
See all 6 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.