Abstract
In order to elucidate the role of antioxidant responses in salinity tolerance in rice genotypes under salt stress, experiments were conducted using four rice varieties, including salt-sensitive BRRI dhan 28 and three salt-tolerant varieties BRRI dhan 47, BINA dhan 8 and BINA dhan 10. Thirty-day-old rice seedlings were transplanted into pots. At the active tillering stage (35 d after transplanting), plants were exposed to different salinity levels (0, 20, 40 and 60 mmol/L NaCl). Salt stress caused a significant reduction in growth for all the rice genotypes. Growth reduction was higher in the salt-sensitive genotype than in the salt-tolerant ones, and BINA dhan 10 showed higher salt tolerance in all measured physiological parameters. The reduction in shoot and root biomass was found to be minimal in BINA dhan 10. Chlorophyll content significantly decreased under salt stress except for BINA dhan 10. Proline content significantly increased in salt-tolerant rice genotypes with increased salt concentration, and the highest proline content was obtained from BINA dhan 10 under salt stress. Catalase and ascorbate peroxidase activities significantly decreased in salt-sensitive genotype whereas significantly increased in salt-tolerant ones with increasing salt concentration. However, salt stress significantly decreased guaiacol peroxidase activity in all the rice genotypes irrespective of salt tolerance. K+/Na+ ratio also significantly decreased in shoots and roots of all the rice genotypes. The salt-tolerant genotype BINA dhan 10 maintained higher levels of chlorophyll and proline contents as well as catalase and ascorbate peroxidase activities under salt stress, thus, this might be the underlying mechanism for salt tolerance.
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Claims 9
Claim · model-written summary
Salt stress significantly reduced growth in all rice genotypes.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress caused a significant reduction in growth for all the rice genotypes”
e1“0, 20, 40 and 60 mmol/L NaCl”
Claim · model-written summary
BINA dhan 10 had higher salt tolerance across measured physiological parameters.
- Taxon
- rice
Oryza sativae1 - Material
- BINA dhan 10e0
- Outcome
- salt tolerance in all measured physiological parameterse0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BINA dhan 10 showed higher salt tolerance in all measured physiological parameters”
e1“four rice varieties”
Claim · model-written summary
BINA dhan 10 had minimal shoot and root biomass reductions.
- Taxon
- riceOryza sativae1
- Material
- BINA dhan 10e0
- Outcome
- shoot and root biomasse0
- Direction
- reductione0
- Qualifier
- minimale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in shoot and root biomass was found to be minimal in BINA dhan 10”
e1“four rice varieties”
Claim · model-written summary
Proline content significantly rose with salinity in tolerant rice genotypes.
- Taxon
- riceOryza sativae0
- Material
- salt-tolerant rice genotypese0
- Treatment
- increased salt concentratione0
- Outcome
- Proline contente0
- Direction
- increasede0
- Comparator
- 0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proline content significantly increased in salt-tolerant rice genotypes with increased salt concentration”
e1“0, 20, 40 and 60 mmol/L NaCl”
Claim · model-written summary
BINA dhan 10 had the highest proline under salt stress.
- Taxon
- riceOryza sativae1
- Material
- BINA dhan 10e0
- Outcome
- proline contente0
- Direction
- higheste0
- Qualifier
- under salt stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest proline content was obtained from BINA dhan 10 under salt stress”
e1“four rice varieties”
Claim · model-written summary
Salt stress significantly decreased guaiacol peroxidase activity in all rice genotypes.
- Taxon
- riceOryza sativae0
- Treatment
- salt stresse0
- Outcome
- guaiacol peroxidase activitye0
- Direction
- decreasede0
- Comparator
- 0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salt stress significantly decreased guaiacol peroxidase activity in all the rice genotypes irrespective of salt tolerance”
e1“0, 20, 40 and 60 mmol/L NaCl”
Claim · model-written summary
BINA dhan 10 retained higher chlorophyll and proline under salt stress.
- Taxon
- riceOryza sativae1
- Material
- BINA dhan 10e0
- Outcome
- chlorophyll and proline contentse0
- Direction
- highere0
- Qualifier
- under salt stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BINA dhan 10 maintained higher levels of chlorophyll and proline contents as well as catalase and ascorbate peroxidase activities under salt stress”
e1“four rice varieties”
Claim · model-written summary
BINA dhan 10 retained higher catalase and ascorbate peroxidase activities under salt stress.
- Taxon
- riceOryza sativae1
- Material
- BINA dhan 10e0
- Outcome
- catalase and ascorbate peroxidase activitiese0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BINA dhan 10 maintained higher levels of chlorophyll and proline contents as well as catalase and ascorbate peroxidase activities under salt stress”
e1“four rice varieties”
Claim · model-written summary
Authors suggest higher chlorophyll, proline, and antioxidant activities may underlie BINA dhan 10 salt tolerance.
- Taxon
- riceOryza sativae1
- Material
- BINA dhan 10e0
- Outcome
- salt tolerancee0
- Qualifier
- higher levels of chlorophyll and proline contents as well as catalase and ascorbate peroxidase activitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BINA dhan 10 maintained higher levels of chlorophyll and proline contents as well as catalase and ascorbate peroxidase activities under salt stress, thus, this might be the underlying mechanism for salt tolerance”
e1“four rice varieties”
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