Abstract
Among abiotic stresses salinity is one of the serious threats for food security worldwide. Sunflower is ranked 5 th among crops grown for food security and being moderately salt tolerant is a better choice for growing on saline soil. Application of various compounds including vitamin E might be a beneficial technique for improving growth in plants under saline conditions. A pot experiment was conducted to explore the role of alpha tocopherol seed treatment for inducing salt tolerance in sunflower. Seeds of two sunflower cultivars (FH-572 and FH-621) were soaked for 16 h in four levels of alpha tocopherol i.e. control (distilled water), 100, 200, 300 mg L -1 and two levels of NaCl salt (0 and 120 mM) were applied with full strength Hoagland's solution 35 days after seed sowing. Salt stress caused significant decrease in shoot and root fresh weight, leaf relative water content and inhibition in shoot length. Salinity stress increased leaf turgor potential and had non-significant effect on photosynthetic pigments, osmotic potential and gas exchange characteristics. Seed treatment with -tocopherol considerably increased shoot and root fresh weight, shoot length, net CO2 assimilation rate, stomatal conductance (gs) and water use efficiency; however, it showed non-significant effect on photosynthetic pigments, leaf water relation parameters and transpiration rate. Alpha tocopherol, 100 and 300 mg L -1 levels were effective in ameliorating the negative impact of salt stress in cv. FH-572 and cv. FH-621, respectively. Results depicts great varietal difference in salinity tolerance and cultivar FH-621 performed better than cv. FH-572 under salinity stress.
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Claims 9
Claim · model-written summary
Salt stress significantly reduced sunflower shoot and root fresh weight, leaf relative water content, and shoot length.
- Treatment
- Salt stresse0
- Outcome
- shoot and root fresh weight, leaf relative water contente0
- Direction
- decreasee0
Not reportedTaxonComparator
Verbatim
e0“Salt stress caused significant decrease in shoot and root fresh weight, leaf relative water content and inhibition in shoot length.”
Claim · model-written summary
Salinity increased leaf turgor potential.
Not reportedTaxonComparator
Verbatim
e0“Salinity stress increased leaf turgor potential and had non-significant effect on photosynthetic pigments, osmotic potential and gas exchange characteristics.”
Claim · model-written summary
Salinity had nonsignificant effects on photosynthetic pigments, osmotic potential, and gas exchange characteristics.
- Treatment
- Salinity stresse0
- Outcome
- photosynthetic pigments, osmotic potential and gas exchange characteristicse0
Not reportedTaxonComparatorDirection
Verbatim
e0“Salinity stress increased leaf turgor potential and had non-significant effect on photosynthetic pigments, osmotic potential and gas exchange characteristics.”
Claim · model-written summary
Tocopherol seed treatment increased shoot and root fresh weight and shoot length.
- Treatment
- Seed treatment with -tocopherole0
- Outcome
- shoot and root fresh weight, shoot lengthe0
- Direction
- increasede0
Not reportedTaxonComparator
Verbatim
e0“Seed treatment with -tocopherol considerably increased shoot and root fresh weight, shoot length, net CO2 assimilation rate, stomatal conductance (gs) and water use efficiency; however, it showed non-significant effect on photosynthetic pigments, leaf water relation parameters and transpiration rate.”
Claim · model-written summary
Tocopherol seed treatment increased net CO2 assimilation, stomatal conductance, and water use efficiency.
- Treatment
- Seed treatment with -tocopherole0
- Outcome
- net CO2 assimilation rate, stomatal conductance (gs) and water use efficiencye0
- Direction
- increasede0
Not reportedTaxonComparator
Verbatim
e0“Seed treatment with -tocopherol considerably increased shoot and root fresh weight, shoot length, net CO2 assimilation rate, stomatal conductance (gs) and water use efficiency; however, it showed non-significant effect on photosynthetic pigments, leaf water relation parameters and transpiration rate.”
Claim · model-written summary
Tocopherol treatment had nonsignificant effects on pigments, leaf water relations, and transpiration.
- Treatment
- Seed treatment with -tocopherole0
- Outcome
- photosynthetic pigments, leaf water relation parameters and transpiration ratee0
Not reportedTaxonComparatorDirection
Verbatim
e0“Seed treatment with -tocopherol considerably increased shoot and root fresh weight, shoot length, net CO2 assimilation rate, stomatal conductance (gs) and water use efficiency; however, it showed non-significant effect on photosynthetic pigments, leaf water relation parameters and transpiration rate.”
Claim · model-written summary
The 100 mg L -1 level ameliorated salt effects in FH-572.
- Material
- FH-572e0
- Treatment
- Alpha tocopherol, 100e0
- Outcome
- negative impact of salt stresse0
- Direction
- amelioratinge0
Not reportedTaxonComparator
Verbatim
e0“Alpha tocopherol, 100 and 300 mg L -1 levels were effective in ameliorating the negative impact of salt stress in cv. FH-572 and cv. FH-621, respectively.”
Claim · model-written summary
The 300 mg L -1 level ameliorated salt effects in FH-621.
- Material
- FH-621e0
- Treatment
- 300 mg L -1e0
- Outcome
- negative impact of salt stresse0
- Direction
- amelioratinge0
Not reportedTaxonComparator
Verbatim
e0“Alpha tocopherol, 100 and 300 mg L -1 levels were effective in ameliorating the negative impact of salt stress in cv. FH-572 and cv. FH-621, respectively.”
Claim · model-written summary
FH-621 performed better than FH-572 under salt stress.
- Material
- FH-621e0
- Outcome
- salinity tolerancee0
- Direction
- bettere0
- Qualifier
- under salinity stresse0
- Comparator
- FH-572e0
Not reportedTaxon
Verbatim
e0“Results depicts great varietal difference in salinity tolerance and cultivar FH-621 performed better than cv. FH-572 under salinity stress.”