Abstract
Abstract Plant hormones are considered to play an important role in plant adaptation to drought and salt stress. The objective of the study was to investigate the changes in endogenous jasmonic acid ( JA ) in relation to differences in the salt resistance of maize genotypes. Two maize genotypes ( SR 03 and Across 8023) were compared for changes in water relations, growth and tissue JA levels in response to 100 m m NaCl. Salt stress significantly reduced the shoot growth of both genotypes; however, SR 03 exhibited significantly less reduction in relative shoot fresh weight than Across 8023. Both genotypes showed an identical response to salt stress regarding plant water relations; therefore, genotypic differences in the salt resistance could not be attributed to changes in shoot turgor and these results were further confirmed by the response of both genotypes under equiosmotic stress (−0.49 MP a) of either 100 m m NaCl or PEG ‐6000. GC ‐ MS / MS analysis showed that salt stress did not alter shoot JA levels of both genotypes, however significantly increased the root JA levels of Across 8023. In contrast, root JA levels of salt‐resistant SR 03 did not change by salt stress. Increase in root JA levels in response to stress treatments does not coincide with the growth inhibition of shoot in Across 8023. In contrast, both PEG and NaCl did not change the JA concentrations in both root and shoot tissues of SR 03. Growth assays with maize seedlings showed that JA supply in root medium inhibits shoot extension growth and both maize genotypes were sensitive to the inhibitory effects of JA . These results suggest that maize genotypes differ in JA accumulation during the first phase of salt stress and JA may indirectly be involved in leaf growth inhibition of the salt‐sensitive genotype. In addition, our results also showed that treatment of salt‐stressed plants with exogenous JA improved the Na + exclusion by decreasing the Na + uptake at the root surface.
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Claims 12
Claim · model-written summary
Salt stress significantly reduced shoot growth of both maize genotypes.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress significantly reduced the shoot growth of both genotypes”
t0“Maize Genotypes Differing in Salt Resistance Vary in Jasmonic Acid Accumulation During the First Phase of Salt Stress”
Claim · model-written summary
SR 03 had significantly less reduction in relative shoot fresh weight than Across 8023 under salt stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SR 03 exhibited significantly less reduction in relative shoot fresh weight than Across 8023”
t0“Maize Genotypes Differing in Salt Resistance Vary in Jasmonic Acid Accumulation During the First Phase of Salt Stress”
Claim · model-written summary
The two genotypes had identical plant water-relations responses to salt stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both genotypes showed an identical response to salt stress regarding plant water relations”
t0“Maize Genotypes Differing in Salt Resistance Vary in Jasmonic Acid Accumulation During the First Phase of Salt Stress”
Claim · model-written summary
Shoot turgor did not explain the difference in salt resistance between genotypes, including under equiosmotic stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genotypic differences in the salt resistance could not be attributed to changes in shoot turgor and these results were further confirmed by the response of both genotypes under equiosmotic stress (−0.49 MP a) of either 100 m m NaCl or PEG ‐6000”
t0“Maize Genotypes Differing in Salt Resistance Vary in Jasmonic Acid Accumulation During the First Phase of Salt Stress”
Claim · model-written summary
Salt stress did not alter shoot JA levels in either genotype.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salt stress did not alter shoot JA levels of both genotypes”
t0“Maize Genotypes Differing in Salt Resistance Vary in Jasmonic Acid Accumulation During the First Phase of Salt Stress”
Claim · model-written summary
Salt stress significantly increased root JA levels in Across 8023.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significantly increased the root JA levels of Across 8023”
e1“salt stress did not alter shoot JA levels of both genotypes, however significantly increased the root JA levels of Across 8023”
t0“Maize Genotypes Differing in Salt Resistance Vary in Jasmonic Acid Accumulation During the First Phase of Salt Stress”
Claim · model-written summary
Root JA levels of salt-resistant SR 03 did not change under salt stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root JA levels of salt‐resistant SR 03 did not change by salt stress”
t0“Maize Genotypes Differing in Salt Resistance Vary in Jasmonic Acid Accumulation During the First Phase of Salt Stress”
Claim · model-written summary
In Across 8023, increased root JA under stress did not coincide with shoot growth inhibition.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase in root JA levels in response to stress treatments does not coincide with the growth inhibition of shoot in Across 8023”
t0“Maize Genotypes Differing in Salt Resistance Vary in Jasmonic Acid Accumulation During the First Phase of Salt Stress”
Claim · model-written summary
PEG did not change root or shoot JA concentration in SR 03.
- Material
- SR 03e0
- Treatment
- PEGe0
- Outcome
- JA concentrations in both root and shoot tissuese0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both PEG and NaCl did not change the JA concentrations in both root and shoot tissues of SR 03”
t0“Maize Genotypes Differing in Salt Resistance Vary in Jasmonic Acid Accumulation During the First Phase of Salt Stress”
Claim · model-written summary
NaCl did not change root or shoot JA concentration in SR 03.
- Material
- SR 03e0
- Treatment
- NaCle0
- Outcome
- JA concentrations in both root and shoot tissuese0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both PEG and NaCl did not change the JA concentrations in both root and shoot tissues of SR 03”
t0“Maize Genotypes Differing in Salt Resistance Vary in Jasmonic Acid Accumulation During the First Phase of Salt Stress”
Claim · model-written summary
JA supplied in root medium inhibited shoot extension growth in both genotypes.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“JA supply in root medium inhibits shoot extension growth and both maize genotypes were sensitive to the inhibitory effects of JA”
t0“Maize Genotypes Differing in Salt Resistance Vary in Jasmonic Acid Accumulation During the First Phase of Salt Stress”
Claim · model-written summary
Exogenous JA improved sodium exclusion in salt-stressed plants by decreasing sodium uptake at the root surface.
- Treatment
- exogenous JAe0
- Outcome
- Na + exclusione0
- Direction
- improvede0
- Qualifier
- decreasing the Na + uptake at the root surfacee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatment of salt‐stressed plants with exogenous JA improved the Na + exclusion by decreasing the Na + uptake at the root surface”
t0“Maize Genotypes Differing in Salt Resistance Vary in Jasmonic Acid Accumulation During the First Phase of Salt Stress”
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