Abstract
Two forage sorghum genotypes were studied: CSF18 (salt-sensitive) and CSF20 (salt-tolerant). Shoot growth reduction as a result of salt stress was stronger in the salt sensitive genotype compared to the salt tolerant one. When the two genotypes were subjected to salt stress (75 mM NaCl) no significant change in lipid peroxidation was observed. However, salt stress induced increases in superoxide dismutase and catalase activities in both genotypes. These salt-induced increases were higher in the salt-tolerant genotype. Peroxidase activity was differentially affected by salt stress in the two genotypes. The activities of these peroxidases were decreased by salt stress in the salt-sensitive genotype and increased in the salt-tolerant genotype. In addition, the activity ratio between the superoxide dismutase and the H2O2-scavenging enzymes was higher in the salt-sensitive genotype. The results obtained support the hypothesis that the higher efficiency of the antioxidant-enzymatic system of the CSF20 genotype could be considered as one of the factors responsible for its tolerance to salt stress. Therefore, it is suggested that the ratio between superoxide dismutase and H2O2-scavenging enzyme activities could be used as a working hypothesis for a biochemical marker for salt tolerance in sorghum.
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Claims 8
Claim · model-written summary
Salt stress reduced shoot growth more in the sensitive than tolerant genotype.
- Material
- salt sensitive genotypee0
- Outcome
- Shoot growth reductione0
- Direction
- strongere0
- Comparator
- salt tolerant onee0
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot growth reduction as a result of salt stress was stronger in the salt sensitive genotype compared to the salt tolerant one.”
t0“sorghum”
Claim · model-written summary
At 75 mM NaCl, lipid peroxidation did not change significantly in the two genotypes.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the two genotypes were subjected to salt stress (75 mM NaCl) no significant change in lipid peroxidation was observed.”
t0“sorghum”
Claim · model-written summary
Salt stress increased superoxide dismutase and catalase activities in both genotypes.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, salt stress induced increases in superoxide dismutase and catalase activities in both genotypes.”
t0“sorghum”
Claim · model-written summary
Salt-induced antioxidant-enzyme increases were higher in the tolerant genotype.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These salt-induced increases were higher in the salt-tolerant genotype.”
t0“sorghum”
Claim · model-written summary
Salt stress decreased peroxidase activities in the salt-sensitive genotype.
- Material
- salt-sensitive genotypee0
- Treatment
- salt stresse0
- Outcome
- activities of these peroxidasese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of these peroxidases were decreased by salt stress in the salt-sensitive genotype and increased in the salt-tolerant genotype.”
t0“sorghum”
Claim · model-written summary
Salt stress increased peroxidase activities in the salt-tolerant genotype.
- Material
- salt-tolerant genotypee0
- Treatment
- salt stresse0
- Outcome
- activities of these peroxidasese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of these peroxidases were decreased by salt stress in the salt-sensitive genotype and increased in the salt-tolerant genotype.”
t0“sorghum”
Claim · model-written summary
The superoxide dismutase to H2O2-scavenging enzyme activity ratio was higher in the sensitive genotype.
- Material
- salt-sensitive genotypee0
- Outcome
- activity ratio between the superoxide dismutase and the H2O2-scavenging enzymese0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In addition, the activity ratio between the superoxide dismutase and the H2O2-scavenging enzymes was higher in the salt-sensitive genotype.”
t0“sorghum”
Claim · model-written summary
The enzyme activity ratio is proposed as a candidate biochemical marker for sorghum salt tolerance.
- Outcome
- biochemical marker for salt tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Therefore, it is suggested that the ratio between superoxide dismutase and H2O2-scavenging enzyme activities could be used as a working hypothesis for a biochemical marker for salt tolerance in sorghum.”
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