Abstract
Salinity is one of the major environmental stresses impeding crop growth,which can lead to a series of morphological,physiological,biochemical and molecular changes that severely reduces agricultural yields and productivity.The ability to tolerate salinity stresses differs widely among species of plants as well as within different varieties in the same species.As an important cash crop,productivity of soybean can be significantly hampered by soil salt stresses and high salinity can sharply decline growth and give bad impacts on variable agronomy traits,seed quality and quantity,and finally reduce its commercial yield.Although most soybean varieties are sensitive to salt stresses,soybean germplasms display a spectrum of salt tolerance capability from high to low.Moreover,the degree of salt tolerance of soybean varieties varies among different developmental stages.To achieve a better understanding of salt tolerant mechanisms of soybean varieties,and determine the most reliable indicators for distinguishing high salt-tolerance varieties,seeds of 4 soybean varieties(respectively,21066-2,22021-1,22293-1 and 22451-1 provided by Harbin Agricultural Academy of Science) were sowed in soil containers(45 cm in length,32 cm in width,13.5 cm in height) for simulating natural growth conditions,and their salt tolerance capability in emergence and seedling stages under 150 mmol/L NaCl treatments were evaluated in this paper through measuring variable morphological and physiological parameters including plant height,hypocotyls length,lateral root numbers,fresh and dry weight of shoots and roots,contents of malondialdehyde(MDA) and free proline(Pro),activity of superoxide dismutase(SOD) in emergence and seedling stages.And then the seedlings were transplanted into field for recording seed yield at their natural maturity.Our results clearly showed that NaCl treatments could strongly decrease the plant height,fresh and dry weight of shoots and roots of the 4 varieties both in their emergence stage and seedling stage,while lateral root numbers and hypocotyls length decreased in the emergence stage but increased in the seedling stage.Under the unstressed control condition,MDA content and SOD activity in the salt-tolerant 22021-1 variety were significantly higher than those in the salt-sensitive 22293-1 variety both in the emergence stage and seedling stage(P0.05).However,MDA content sharply decreased(P0.01) and SOD activity significantly increased(P0.05) in salt-tolerant 22021-1 variety after exposure to salt stresses,i.e,51.03% and 21.45% declines in MDA content and 5.85% and 45.77% enhancements in SOD activity were respectively found in the emergence stage and seedling stage.Different from 22021-1,22293-1 variety showed a 58.97% increase in the MDA content(P0.01) in emergence stage but no significant change in seedling stage(P0.05),while these salt stresses slightly increased the SOD activity in the two stages but cannot be up to statistical significance(P0.05).The final commercial yield was affected by the short-term salt stress treatments,but differed in different soybean varieties.Generally,the salinity tolerance or sensitivity of soybean varieties were well related to their antioxidant response,and high salt stress tolerability in the 22021-1 variety was associated with the ability of maintaining higher SOD activity for lowering the possible lipid peroxidation.Our finding indicates that leaf MDA level and SOD activity could be used as two physiological indices for assessing the salt tolerability of variable soybean varieties.
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Claims 16
Claim · model-written summary
NaCl treatment strongly decreased plant height of the 4 soybean varieties at both emergence and seedling stages.
- Taxon
- soybean
Glycine maxt0 - Organ / stage
- emergence stage and seedling stagee0
- Treatment
- NaCl treatmentse0
- Outcome
- plant heighte0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl treatments could strongly decrease the plant height, fresh and dry weight of shoots and roots of the 4 varieties both in their emergence stage and seedling stage”
t0“soybean”
Claim · model-written summary
NaCl treatment strongly decreased fresh and dry weight of shoots and roots of the 4 soybean varieties at both stages.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- emergence stage and seedling stagee0
- Treatment
- NaCl treatmentse0
- Outcome
- fresh and dry weight of shoots and rootse0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl treatments could strongly decrease the plant height, fresh and dry weight of shoots and roots of the 4 varieties both in their emergence stage and seedling stage”
t0“soybean”
Claim · model-written summary
Under 150 mmol/L NaCl, lateral root numbers and hypocotyl length decreased in the emergence stage.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- emergence stagee0
- Treatment
- 150 mmol/L NaCle1
- Outcome
- lateral root numbers and hypocotyls lengthe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lateral root numbers and hypocotyls length decreased in the emergence stage but increased in the seedling stage”
e1“150 mmol/L NaCl”
t0“soybean”
Claim · model-written summary
Under 150 mmol/L NaCl, lateral root numbers and hypocotyl length increased in the seedling stage.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- seedling stagee0
- Treatment
- 150 mmol/L NaCle1
- Outcome
- lateral root numbers and hypocotyls lengthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lateral root numbers and hypocotyls length decreased in the emergence stage but increased in the seedling stage”
e1“150 mmol/L NaCl”
t0“soybean”
Claim · model-written summary
Without stress, MDA content and SOD activity in salt-tolerant 22021-1 were significantly higher than in salt-sensitive 22293-1 at both emergence and seedling stages.
- Taxon
- soybeanGlycine maxt0
- Material
- salt-tolerant 22021-1 varietye0
- Outcome
- MDA content and SOD activitye0
- Direction
- highere0
- Comparator
- salt-sensitive 22293-1 varietye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the unstressed control condition,MDA content and SOD activity in the salt-tolerant 22021-1 variety were significantly higher than those in the salt-sensitive 22293-1 variety both in the emergence stage and seedling stage”
t0“soybean”
Claim · model-written summary
After salt stress, MDA content of salt-tolerant 22021-1 declined by 51.03% in the emergence stage.
- Taxon
- soybeanGlycine maxt0
- Material
- salt-tolerant 22021-1 varietye0
- Organ / stage
- emergence stagee0
- Treatment
- salt stressese0
- Outcome
- MDA contente0
- Direction
- declinese0
- Value
- 51.03%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MDA content sharply decreased(P0.01) and SOD activity significantly increased(P0.05) in salt-tolerant 22021-1 variety after exposure to salt stresses,i.e,51.03% and 21.45% declines in MDA content and 5.85% and 45.77% enhancements in SOD activity were respectively found in the emergence stage and seedling stage”
t0“soybean”
Claim · model-written summary
After salt stress, MDA content of salt-tolerant 22021-1 declined by 21.45% in the seedling stage.
- Taxon
- soybeanGlycine maxt0
- Material
- salt-tolerant 22021-1 varietye0
- Organ / stage
- seedling stagee0
- Treatment
- salt stressese0
- Outcome
- MDA contente0
- Direction
- declinese0
- Value
- 21.45%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MDA content sharply decreased(P0.01) and SOD activity significantly increased(P0.05) in salt-tolerant 22021-1 variety after exposure to salt stresses,i.e,51.03% and 21.45% declines in MDA content and 5.85% and 45.77% enhancements in SOD activity were respectively found in the emergence stage and seedling stage”
t0“soybean”
Claim · model-written summary
After salt stress, SOD activity of salt-tolerant 22021-1 rose by 5.85% in the emergence stage.
- Taxon
- soybeanGlycine maxt0
- Material
- salt-tolerant 22021-1 varietye0
- Organ / stage
- emergence stagee0
- Treatment
- salt stressese0
- Outcome
- SOD activitye0
- Direction
- enhancementse0
- Value
- 5.85%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MDA content sharply decreased(P0.01) and SOD activity significantly increased(P0.05) in salt-tolerant 22021-1 variety after exposure to salt stresses,i.e,51.03% and 21.45% declines in MDA content and 5.85% and 45.77% enhancements in SOD activity were respectively found in the emergence stage and seedling stage”
t0“soybean”
Claim · model-written summary
After salt stress, SOD activity of salt-tolerant 22021-1 rose by 45.77% in the seedling stage.
- Taxon
- soybeanGlycine maxt0
- Material
- salt-tolerant 22021-1 varietye0
- Organ / stage
- seedling stagee0
- Treatment
- salt stressese0
- Outcome
- SOD activitye0
- Direction
- enhancementse0
- Value
- 45.77%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MDA content sharply decreased(P0.01) and SOD activity significantly increased(P0.05) in salt-tolerant 22021-1 variety after exposure to salt stresses,i.e,51.03% and 21.45% declines in MDA content and 5.85% and 45.77% enhancements in SOD activity were respectively found in the emergence stage and seedling stage”
t0“soybean”
Claim · model-written summary
In variety 22293-1, MDA content rose by 58.97% in the emergence stage under salt stress.
- Taxon
- soybeanGlycine maxt0
- Material
- 22293-1 varietye0
- Organ / stage
- emergence stagee0
- Treatment
- 150 mmol/L NaCle1
- Outcome
- MDA contente0
- Direction
- increasee0
- Value
- 58.97%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“22293-1 variety showed a 58.97% increase in the MDA content(P0.01) in emergence stage but no significant change in seedling stage(P0.05)”
e1“150 mmol/L NaCl”
t0“soybean”
Claim · model-written summary
In variety 22293-1, MDA content showed no significant change in the seedling stage under salt stress.
- Taxon
- soybeanGlycine maxt0
- Material
- 22293-1 varietye0
- Organ / stage
- seedling stagee0
- Treatment
- 150 mmol/L NaCle1
- Outcome
- MDA contente0
- Direction
- no significant changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“22293-1 variety showed a 58.97% increase in the MDA content(P0.01) in emergence stage but no significant change in seedling stage(P0.05)”
e1“150 mmol/L NaCl”
t0“soybean”
Claim · model-written summary
In variety 22293-1, salt stress slightly increased SOD activity in both stages, but not to statistical significance.
- Taxon
- soybeanGlycine maxt0
- Material
- 22293-1 varietye1
- Treatment
- salt stressese0
- Outcome
- SOD activitye0
- Direction
- slightly increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these salt stresses slightly increased the SOD activity in the two stages but cannot be up to statistical significance(P0.05)”
e1“22293-1 variety showed”
t0“soybean”
Claim · model-written summary
Final commercial yield was affected by short-term salt stress treatments, and the effect differed among soybean varieties.
- Taxon
- soybeanGlycine maxe0
- Treatment
- short-term salt stress treatmentse0
- Outcome
- final commercial yielde0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The final commercial yield was affected by the short-term salt stress treatments,but differed in different soybean varieties”
Claim · model-written summary
Salinity tolerance or sensitivity of the soybean varieties was well related to their antioxidant response.
- Taxon
- soybeanGlycine maxe0
- Material
- soybean varietiese0
- Outcome
- salinity tolerance or sensitivitye0
- Qualifier
- antioxidant responsee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the salinity tolerance or sensitivity of soybean varieties were well related to their antioxidant response”
Claim · model-written summary
High salt tolerance in variety 22021-1 was associated with maintaining higher SOD activity, which may lower lipid peroxidation.
- Taxon
- soybeanGlycine maxt0
- Material
- 22021-1 varietye0
- Gene
- SODe0
- Outcome
- high salt stress tolerabilitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high salt stress tolerability in the 22021-1 variety was associated with the ability of maintaining higher SOD activity for lowering the possible lipid peroxidation”
t0“soybean”
Claim · model-written summary
Leaf MDA level and SOD activity could be used as two physiological indices for assessing salt tolerability of soybean varieties.
- Taxon
- soybeanGlycine maxe0
- Organ / stage
- leafe0
- Outcome
- leaf MDA level and SOD activity could be used as two physiological indicese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf MDA level and SOD activity could be used as two physiological indices for assessing the salt tolerability of variable soybean varieties”
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