Abstract
Effects of exogenous ABA on excitation energy distribution and osmotic adjustment of maize seedlings under NaCl stress were studied by methods of gas exchange and chlorophyll fluorescence quench.In the presence of 200 mM NaCl,photosynthesis(Pn)and stomatal conductance(Gs)were decreased by addition of ABA.The obvious decrease of intercellular CO2(Ci)along with the decrease of Pn by addition of ABA indicated that the decrease of Pn was caused by the decrease of stomatal conductance,which led to the increase of excessive excitation energy.However,the addition of ABA increased photochemical quench(qP)and enhanced energy dissipation ability(NPQ),which decreased the accumulation of excessive excitation energy,then alleviated the photoinhibition caused by NaCl stress,this was manifested by the fact that the decrease of Fv/Fm in the presence of NaCl was mitigated by addition of ABA in the maize leaves.In addition,the plant water status of the maize leaves was improved by the application of ABA.The addition of ABA significantly increased water potential and decreased osmotic potential as well as inducing accumulation of proline,which enhanced osmotic adjustment of maize leaves under salinity stress to ensure leaves maintaining higher turgor pressure in osmotic stressed condition.These effects were the main reasons why exogenous ABA improved salt resistance in maize leaves.
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Claims 11
Claim · model-written summary
ABA reduced photosynthesis and stomatal conductance under 200 mM NaCl.
- Treatment
- addition of ABAe0
- Outcome
- photosynthesis(Pn)and stomatal conductance(Gs)e0
- Direction
- decreasede0
- Comparator
- 200 mM NaCle0
Not reportedTaxon
Verbatim
e0“In the presence of 200 mM NaCl,photosynthesis(Pn)and stomatal conductance(Gs)were decreased by addition of ABA.”
Claim · model-written summary
ABA reduced intercellular CO2, consistent with reduced photosynthesis through lower stomatal conductance.
- Treatment
- addition of ABAe0
- Outcome
- decrease of Pne0
- Direction
- decreasee0
- Qualifier
- decrease of stomatal conductancee0
Not reportedTaxon
Verbatim
e0“The obvious decrease of intercellular CO2(Ci)along with the decrease of Pn by addition of ABA indicated that the decrease of Pn was caused by the decrease of stomatal conductance”
Claim · model-written summary
ABA increased photochemical quenching and energy dissipation capacity.
- Treatment
- addition of ABAe0
- Outcome
- photochemical quench(qP)and enhanced energy dissipation ability(NPQ)e0
- Direction
- increasede0
Not reportedTaxonComparator
Verbatim
e0“the addition of ABA increased photochemical quench(qP)and enhanced energy dissipation ability(NPQ)”
Claim · model-written summary
ABA decreased excessive excitation energy accumulation and alleviated NaCl photoinhibition.
Not reportedTaxonTreatment
Verbatim
e0“which decreased the accumulation of excessive excitation energy,then alleviated the photoinhibition caused by NaCl stress”
Claim · model-written summary
ABA mitigated the NaCl associated decrease of Fv/Fm in maize leaves.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease of Fv/Fm in the presence of NaCl was mitigated by addition of ABA in the maize leaves”
Claim · model-written summary
ABA improved maize leaf water status.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plant water status of the maize leaves was improved by the application of ABA”
Claim · model-written summary
ABA significantly increased water potential in maize leaves.
Not reportedTaxonComparator
Verbatim
e0“The addition of ABA significantly increased water potential”
Claim · model-written summary
ABA decreased osmotic potential in maize leaves.
Not reportedTaxonTreatmentComparator
Verbatim
e0“decreased osmotic potential”
Claim · model-written summary
ABA induced proline accumulation in maize leaves.
Not reportedTaxonTreatmentComparator
Verbatim
e0“inducing accumulation of proline”
Claim · model-written summary
ABA enhanced osmotic adjustment and maintained higher turgor under salinity stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which enhanced osmotic adjustment of maize leaves under salinity stress to ensure leaves maintaining higher turgor pressure in osmotic stressed condition”
Claim · model-written summary
The authors attribute improved maize salt resistance to these ABA effects.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These effects were the main reasons why exogenous ABA improved salt resistance in maize leaves.”
The same questions in other papers
(+)-abscisic acid · physiology: photosynthesis · Zea mays (maize)Positive and negative results
1 in the opposite direction
- no effect
(+)-abscisic acid · physiology: water · Zea mays (maize)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.