Abstract
ABSTRACT The influence of NaCl and Na 2 SO 4 on growth of two maize cultivars ( Zea mays cv. Pioneer 3906 and cv. Across 8023) differing in Na + uptake was investigated in two green‐house experiments. Na + treatment with different accompanying anions (Cl − /SO 4 2− ) showed that ion toxicity was caused by Na + . While shoot growth of the two cultivars was markedly affected by salt in comparison to the control during the first 2–3 weeks, there were only slight differences between the cultivars. The shoot Ca 2+ concentration was reduced in both cultivars, and the youngest leaves contained an even lower concentration compared with the rest of the shoot. During this first phase, Across 8023 tended to have higher concentrations of Ca 2+ than Pioneer 3906. The Na + ‐excluding cultivar Pioneer 3906 showed continuous, although reduced, growth compared with the control, while the Na + concentration in the shoot decreased until flowering. Cultivar Across 8023 accumulated Na + until flowering: the reduction in the growth of stressed plants was greater than that for Pioneer 3906. Leaves of cultivar Across 8023 showed clear toxic symptoms, while those of the more salt‐tolerant cultivar Pioneer 3906 did not. It is concluded that Na + exclusion contributes to the salt tolerance of maize.
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Claims 13
Claim · model-written summary
Sodium ion caused salt toxicity under varying anions.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Na + treatment with different accompanying anions (Cl − /SO 4 2− ) showed that ion toxicity was caused by Na +”
t0“maize”
Claim · model-written summary
Salt markedly affected shoot growth in both cultivars versus controls during the first 2–3 weeks.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot growth of the two cultivars was markedly affected by salt in comparison to the control during the first 2–3 weeks”
t0“maize”
Claim · model-written summary
Early shoot growth differed only slightly between cultivars.
- Outcome
- differences between the cultivarse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were only slight differences between the cultivars”
t0“maize”
Claim · model-written summary
Salt reduced shoot calcium concentration in both cultivars.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The shoot Ca 2+ concentration was reduced in both cultivars”
t0“maize”
e1“shoot growth of the two cultivars was markedly affected by salt in comparison to the control during the first 2–3 weeks”
Claim · model-written summary
Youngest leaves had lower calcium than the rest of the shoot.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the youngest leaves contained an even lower concentration compared with the rest of the shoot”
t0“maize”
Claim · model-written summary
Across 8023 tended to have higher early calcium concentration than Pioneer 3906.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across 8023 tended to have higher concentrations of Ca 2+ than Pioneer 3906”
t0“maize”
Claim · model-written summary
Salt-stressed Pioneer 3906 continued growing at a reduced rate versus controls.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pioneer 3906 showed continuous, although reduced, growth compared with the control”
t0“maize”
e1“shoot growth of the two cultivars was markedly affected by salt in comparison to the control during the first 2–3 weeks”
Claim · model-written summary
Pioneer 3906 shoot sodium concentration declined until flowering.
- Material
- Pioneer 3906e1
- Organ / stage
- shoote0
- Outcome
- Na + concentratione0
- Direction
- decreasede0
- Qualifier
- until floweringe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Na + concentration in the shoot decreased until flowering”
t0“maize”
e1“Across 8023 tended to have higher concentrations of Ca 2+ than Pioneer 3906”
Claim · model-written summary
Across 8023 accumulated sodium until flowering.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivar Across 8023 accumulated Na + until flowering”
t0“maize”
Claim · model-written summary
Salt reduced growth more in Across 8023 than Pioneer 3906.
- Material
- Across 8023e1
- Treatment
- stressed plantse0
- Outcome
- growthe0
- Direction
- reductione0
- Comparator
- Pioneer 3906e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reduction in the growth of stressed plants was greater than that for Pioneer 3906”
t0“maize”
e1“Across 8023 tended to have higher concentrations of Ca 2+ than Pioneer 3906”
Claim · model-written summary
Across 8023 leaves showed toxic symptoms.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves of cultivar Across 8023 showed clear toxic symptoms”
t0“maize”
Claim · model-written summary
Pioneer 3906 leaves lacked toxic symptoms.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while those of the more salt‐tolerant cultivar Pioneer 3906 did not”
t0“maize”
Claim · model-written summary
Sodium exclusion contributes to maize salt tolerance.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Na + exclusion contributes to the salt tolerance of maize”
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