Abstract
The main objective of this study was to examine the influence of salinity on growth and biochemical parameters (NR activity, amino compound accumulation, protein content, some inorganic ion concentrations) of two varieties of maize (Limko and Koka). Salinity (75.0 mol • m-3 NaCl and 37.5 mol • m-3 Na2SO4) significantly reduced fresh and dry weights of the investigated maize varieties. NaCl induced higher reduction in biomass production than Na2SO4. Differences in salt tolerance between Limko and Koka were small.It was found that in both maize varieties the nitrate reductase activity decreased under salt stress (100 mol • m-3 NaCl). This effect was more marked in the Koka variety than Limko. Decrease in nitrate reductase activity had no inhibitory effect on accumulation of protein and free amino compounds. Salinity treatment (100 mol • m-3 NaCl) led to an increase in free amino compound contents in roots and shoots of both investigated maize varieties, but these changes were not very large. The highest increase in amino compound level was observed in roots of Koka and it was 2-fold higher than in control plants. Salt stress did not change soluble protein contents in Limko and Koka varieties with the exception of Limko leaves. There was significant increase in soluble protein content on leaves of Limko and it amounted 128% of the control. Salinity caused a great increase in leaf and root Na+ concentration and a decrease in case of Ca2+ and K+ contents. The declines in Ca2+ content in maize roots were 76 and 70% respectively for Koka and Limko roots. The fall in K+ concentration was high, but not so drastic as in Ca2+. In roots of Koka and Limko the reduction in K+ content was approximately 30%. Higher reduction in K+content showed shoots of Limko. In this case K+ content lowered to 49% of control.
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Claims 16
Claim · model-written summary
Salinity reduced fresh and dry weight in both maize varieties.
- Treatment
- Salinity (75.0 mol • m-3 NaCl and 37.5 mol • m-3 Na2SO4)e0
- Outcome
- fresh and dry weightse0
- Direction
- reducede0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity (75.0 mol • m-3 NaCl and 37.5 mol • m-3 Na2SO4) significantly reduced fresh and dry weights of the investigated maize varieties.”
t0“maize”
Claim · model-written summary
NaCl caused greater biomass reduction than Na2SO4.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl induced higher reduction in biomass production than Na2SO4.”
t0“maize”
Claim · model-written summary
Salt tolerance differed little between Limko and Koka.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in salt tolerance between Limko and Koka were small.”
t0“maize”
Claim · model-written summary
Nitrate reductase activity decreased under NaCl in both varieties.
- Treatment
- 100 mol • m-3 NaCle0
- Gene
- nitrate reductasee0
- Outcome
- nitrate reductase activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in both maize varieties the nitrate reductase activity decreased under salt stress (100 mol • m-3 NaCl).”
Claim · model-written summary
The nitrate reductase decrease was more marked in Koka than Limko.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This effect was more marked in the Koka variety than Limko.”
t0“maize”
Claim · model-written summary
NaCl increased free amino compounds in roots and shoots of both varieties.
- Organ / stage
- roots and shootse0
- Treatment
- 100 mol • m-3 NaCle0
- Outcome
- free amino compound contentse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity treatment (100 mol • m-3 NaCl) led to an increase in free amino compound contents in roots and shoots of both investigated maize varieties”
Claim · model-written summary
Koka root amino compounds rose twofold relative to controls.
- Material
- Kokae0
- Organ / stage
- rootse0
- Outcome
- amino compound levele0
- Direction
- increasee0
- Value
- 2-folde0
- Comparator
- control plantse0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest increase in amino compound level was observed in roots of Koka and it was 2-fold higher than in control plants.”
t0“maize”
Claim · model-written summary
Soluble protein contents were unchanged in Koka and most Limko tissue.
- Material
- Limko and Kokae0
- Treatment
- Salt stresse0
- Outcome
- soluble protein contentse0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress did not change soluble protein contents in Limko and Koka varieties with the exception of Limko leaves.”
t0“maize”
Claim · model-written summary
Limko leaf soluble protein rose to 128% of control.
- Material
- Limkoe0
- Organ / stage
- leavese0
- Outcome
- soluble protein contente0
- Direction
- increasee0
- Value
- 128%e0
- Comparator
- controle0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was significant increase in soluble protein content on leaves of Limko and it amounted 128% of the control.”
t0“maize”
Claim · model-written summary
Salinity increased leaf and root Na+ concentration.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity caused a great increase in leaf and root Na+ concentration”
t0“maize”
Claim · model-written summary
Salinity decreased leaf and root Ca2+ content.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity caused a great increase in leaf and root Na+ concentration and a decrease in case of Ca2+ and K+ contents.”
t0“maize”
Claim · model-written summary
Salinity decreased K+ content.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a decrease in case of Ca2+ and K+ contents.”
t0“maize”
Claim · model-written summary
Root Ca2+ declined 76% in Koka.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The declines in Ca2+ content in maize roots were 76 and 70% respectively for Koka and Limko roots.”
Claim · model-written summary
Root Ca2+ declined 70% in Limko.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The declines in Ca2+ content in maize roots were 76 and 70% respectively for Koka and Limko roots.”
Claim · model-written summary
Root K+ content fell approximately 30% in both varieties.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In roots of Koka and Limko the reduction in K+ content was approximately 30%.”
t0“maize”
Claim · model-written summary
Limko shoot K+ content fell to 49% of control.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher reduction in K+content showed shoots of Limko. In this case K+ content lowered to 49% of control.”
t0“maize”
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