Abstract
Abstract Maize (Zea mays L.) plants in the early stage of development were treated with 80 mM sodium chloride (NaCl) with or without supplemental calcium (Ca2+) (8.75 mM) for a seven day period. The effects of salinity on dry matter production and shoot and root concentrations of sodium (Na+), Ca2+, and potassium (K+) were measured for seven Pioneer maize cultivars. Salinity significantly reduced total dry weight, leaf area, and shoot and root dry weight below control levels. For all seven cultivars, Na+concentrations were reduced and leaf area was significantly increased by supplementing salinized nutrient solutions with 8.75 mM calcium chloride (CaCl2). The two cultivars with the lowest shoot and root Na+ concentrations under NaCl‐salinity showed the greatest increases in total, shoot and root dry weights with the addition of supplemental Ca. Shoot fresh weight/dry weight ratios for all cultivars were decreased significantly by both salinity treatments, but supplemental Ca2+ increased the ratio relative to salinity treatments without supplemental Ca. Root fresh weight/dry weight ratios were decreased only by salinity treatments with supplemental Ca. With NaCl‐salinity, cultivars which had lower shoot and root Na+ concentrations were found to be more salt sensitive and had significantly lower amounts of dry matter production than those cultivars which had higher shoot and root Na+ concentrations. It was concluded that Na+ exclusion from the shoot was not correlated with and was an unreliable indicator of salt tolerance for maize.
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Claims 10
Claim · model-written summary
Salinity significantly reduced total dry weight and leaf area of maize below control levels.
- Organ / stage
- early stage of developmente0
- Treatment
- 80 mM sodium chloride (NaCl)e0
- Outcome
- total dry weight, leaf areae1
- Direction
- reducede1
- Comparator
- control levelse1
Zea maysNot reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) plants in the early stage of development were treated with 80 mM sodium chloride (NaCl)”
e1“Salinity significantly reduced total dry weight, leaf area, and shoot and root dry weight below control levels”
Claim · model-written summary
Salinity significantly reduced shoot and root dry weight of maize below control levels.
- Organ / stage
- early stage of developmente0
- Treatment
- 80 mM sodium chloride (NaCl)e0
- Outcome
- shoot and root dry weighte1
- Direction
- reducede1
- Comparator
- control levelse1
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) plants in the early stage of development were treated with 80 mM sodium chloride (NaCl)”
e1“Salinity significantly reduced total dry weight, leaf area, and shoot and root dry weight below control levels”
Claim · model-written summary
For all seven cultivars, supplemental calcium reduced Na+ concentrations in salinized nutrient solution.
- Treatment
- supplementing salinized nutrient solutions with 8.75 mM calcium chloride (CaCl2)e2
- Outcome
- Na+concentrationse2
- Direction
- reducede2
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“measured for seven Pioneer maize cultivars”
e2“For all seven cultivars, Na+concentrations were reduced and leaf area was significantly increased by supplementing salinized nutrient solutions with 8.75 mM calcium chloride (CaCl2)”
Claim · model-written summary
Supplemental calcium significantly increased leaf area of maize in salinized nutrient solution.
- Treatment
- supplementing salinized nutrient solutions with 8.75 mM calcium chloride (CaCl2)e2
- Outcome
- leaf areae2
- Direction
- significantly increasede2
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“measured for seven Pioneer maize cultivars”
e2“For all seven cultivars, Na+concentrations were reduced and leaf area was significantly increased by supplementing salinized nutrient solutions with 8.75 mM calcium chloride (CaCl2)”
Claim · model-written summary
Shoot fresh weight/dry weight ratios of maize were significantly decreased by both salinity treatments.
- Treatment
- both salinity treatmentse4
- Outcome
- Shoot fresh weight/dry weight ratiose4
- Direction
- decreasede4
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“measured for seven Pioneer maize cultivars”
e4“Shoot fresh weight/dry weight ratios for all cultivars were decreased significantly by both salinity treatments”
Claim · model-written summary
Supplemental calcium increased the shoot fresh weight/dry weight ratio of maize relative to salinity treatments without calcium.
- Treatment
- supplemental Ca2+e5
- Outcome
- the ratioe5
- Direction
- increasede5
- Comparator
- salinity treatments without supplemental Cae5
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“measured for seven Pioneer maize cultivars”
e5“supplemental Ca2+ increased the ratio relative to salinity treatments without supplemental Ca”
Claim · model-written summary
Root fresh weight/dry weight ratios of maize were decreased only by salinity treatments with supplemental calcium.
- Treatment
- salinity treatments with supplemental Cae6
- Outcome
- Root fresh weight/dry weight ratiose6
- Direction
- decreasede6
- Qualifier
- onlye6
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“measured for seven Pioneer maize cultivars”
e6“Root fresh weight/dry weight ratios were decreased only by salinity treatments with supplemental Ca”
Claim · model-written summary
Maize cultivars with lower shoot and root Na+ concentrations were more salt sensitive under NaCl salinity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“measured for seven Pioneer maize cultivars”
e7“cultivars which had lower shoot and root Na+ concentrations were found to be more salt sensitive and had significantly lower amounts of dry matter production than those cultivars which had higher shoot and root Na+ concentrations”
Claim · model-written summary
Maize cultivars with lower shoot and root Na+ concentrations had significantly lower dry matter production under NaCl salinity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“measured for seven Pioneer maize cultivars”
e7“cultivars which had lower shoot and root Na+ concentrations were found to be more salt sensitive and had significantly lower amounts of dry matter production than those cultivars which had higher shoot and root Na+ concentrations”
Claim · model-written summary
Na+ exclusion from the shoot was not correlated with salt tolerance of maize.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Na+ exclusion from the shoot was not correlated with and was an unreliable indicator of salt tolerance for maize”
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