Abstract
This study was carried out to assess the efficiency of nitrogen (N) fertilizer in mitigating the harmful effects of salinity stress on growth and biochemical traits in sorghum genotypes. The experiment was conducted as a factorial trial based on the completely randomized design with four replications under the greenhouse conditions. The factors included four sorghum genotypes (KDFGS1, KDFGS23, KDFGS29 lines, and KFS2 cultivar), two salinity levels (3 and 12 dS m−1) and three nitrogen levels (0, 75 and 150 mg N kg−1soil). The results showed that application of nitrogen fertilizer increased photosynthetic pigments and K+/Na+ ratio in leaf sheath and root. Also, nitrogen dramatically decreased malondialdehyde (MDA) content. This was an indication of the reduced detrimental effects of salinity stress found in all genotypes. In addition, it was found that upon 150 mg N kg−1 treatments, proline (Pro) and antioxidant enzymes markedly decreased in all sorghum genotypes. The highest impact of nitrogen fertilizer for reducing the negative effect of salinity stress was observed in KFS2 (known as tolerant genotype). Due to the highest Pro accumulation in KDFGS23 (known as sensitive genotype), it did not appear to be a suitable criterion for the selection of the tolerant lines/cultivars. In general, the results suggested that using a reasonable N fertilizer level could be used as an efficient tool to improve the growth of the sorghum genotypes subjected to salinity stress and this effect was more pronounced in the tolerant genotype.
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Claims 9
Claim · model-written summary
Nitrogen fertilizer increased photosynthetic pigments in sorghum.
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of nitrogen fertilizer increased photosynthetic pigments and K+/Na+ ratio in leaf sheath and root.”
e1“biochemical traits in sorghum genotypes”
Claim · model-written summary
Nitrogen fertilizer increased the K+/Na+ ratio in sorghum leaf sheath and root.
- Organ / stage
- leaf sheath and roote0
- Treatment
- application of nitrogen fertilizere0
- Outcome
- K+/Na+ ratioe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of nitrogen fertilizer increased photosynthetic pigments and K+/Na+ ratio in leaf sheath and root.”
e1“biochemical traits in sorghum genotypes”
Claim · model-written summary
Nitrogen decreased malondialdehyde content.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen dramatically decreased malondialdehyde (MDA) content.”
e1“biochemical traits in sorghum genotypes”
Claim · model-written summary
Proline decreased in all sorghum genotypes at 150 mg N kg−1.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“upon 150 mg N kg−1 treatments, proline (Pro) and antioxidant enzymes markedly decreased in all sorghum genotypes.”
Claim · model-written summary
Antioxidant enzymes decreased in all sorghum genotypes at 150 mg N kg−1.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“upon 150 mg N kg−1 treatments, proline (Pro) and antioxidant enzymes markedly decreased in all sorghum genotypes.”
Claim · model-written summary
Nitrogen most strongly mitigated salinity stress in KFS2.
- Material
- KFS2e0
- Treatment
- nitrogen fertilizere0
- Outcome
- negative effect of salinity stresse0
- Direction
- reducinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest impact of nitrogen fertilizer for reducing the negative effect of salinity stress was observed in KFS2 (known as tolerant genotype).”
e1“biochemical traits in sorghum genotypes”
Claim · model-written summary
KDFGS23 had the highest proline accumulation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest Pro accumulation in KDFGS23 (known as sensitive genotype)”
e1“biochemical traits in sorghum genotypes”
Claim · model-written summary
The authors judged proline accumulation unsuitable for selecting tolerant lines.
- Outcome
- suitable criterion for the selection of the tolerant lines/cultivarse0
- Qualifier
- Pro accumulatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it did not appear to be a suitable criterion for the selection of the tolerant lines/cultivars.”
e1“the highest Pro accumulation in KDFGS23”
e2“biochemical traits in sorghum genotypes”
Claim · model-written summary
A reasonable nitrogen fertilizer level was suggested to improve growth under salinity.
- Treatment
- a reasonable N fertilizer levele0
- Outcome
- improve the growthe0
- Qualifier
- subjected to salinity stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“using a reasonable N fertilizer level could be used as an efficient tool to improve the growth of the sorghum genotypes subjected to salinity stress and this effect was more pronounced in the tolerant genotype.”
The same questions in other papers
nitrogen · physiology: oxidative · SorghumResults differ
2 papers in the same direction as this paper
- positive
- positive
fertilization · physiology: photosynthesis · SorghumPositive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
nitrogen · physiology: antioxidant enzymes · SorghumResults agree
1 paper in the same direction as this paper
- positive
nitrogen · physiology: osmolytes · SorghumResults agree
1 paper in the same direction as this paper
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.