Abstract
Soil salinity is a major soil threat, causing severe environmental problems. Soil salt stress limits N uptake and cotton growth, especially in arid regions. However, the mechanism underlying stress tolerance in cotton plants under different soil salinity levels has not been fully elucidated. Therefore, the aim of this study was to examine the proportion and mechanism of cotton N uptake and transport under salt stress using the 15N isotope labeling technique. Cotton plants were grown in four undisturbed loamy soils (CK, non-salinity, <2 dS m−1; C1, low salinity, 2–4 dS m−1; C2, mid-salinity, 4–8 dS m−1; and C3, high salinity, 8–15 dS m−1) in the test pit experiments. The findings indicated that the cotton N uptake was limited by the soil salt stress and total N content, and the cotton 15N use efficiency decreased by 25–27% with increasing salinity (>4.0 dS m−1). The N transported to cotton from the 0–20 cm soil layer in C1 treatment was higher than from the 40–60 cm layer. Furthermore, the cotton fruit cultivated in C1 exhibited a notably elevated dry matter content compared to those cultivated in the control treatment. As the soil salt stress increased from the control treatment to C1, the cotton stems and fruits demonstrated a gradual enhancement in their N uptake and regulatory capabilities, albeit with a slight decrease observed in the leaves. These findings emphasize that soil salt stress diminishes cotton nitrogen uptake and transport, potentially exacerbating nitrogen pollution in the absence of optimized nitrogen fertilization.
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Claims 7
Claim · model-written summary
Soil salt stress limited cotton nitrogen uptake.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- soil salt stresse0
- Outcome
- cotton N uptakee0
- Direction
- limitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the cotton N uptake was limited by the soil salt stress and total N content”
Claim · model-written summary
Cotton nitrogen use efficiency fell 25–27% with salinity above 4.0 dS m−1.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- increasing salinity (>4.0 dS m−1)e0
- Outcome
- cotton 15N use efficiencye0
- Direction
- decreasede0
- Value
- 25–27%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cotton 15N use efficiency decreased by 25–27% with increasing salinity (>4.0 dS m−1)”
Claim · model-written summary
In C1, more nitrogen was transported from the upper soil layer than from the deeper layer.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- C1 treatmente0
- Outcome
- N transported to cottone0
- Direction
- highere0
- Qualifier
- 0–20 cm soil layere0
- Comparator
- 40–60 cm layere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N transported to cotton from the 0–20 cm soil layer in C1 treatment was higher than from the 40–60 cm layer.”
Claim · model-written summary
C1 increased cotton fruit dry matter content relative to control.
- Taxon
- cottonGossypium hirsutume0
- Organ / stage
- fruite0
- Treatment
- C1e0
- Outcome
- dry matter contente0
- Direction
- elevatede0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the cotton fruit cultivated in C1 exhibited a notably elevated dry matter content compared to those cultivated in the control treatment.”
Claim · model-written summary
From control to C1 salinity, stem nitrogen uptake and regulation rose.
- Taxon
- cottonGossypium hirsutume0
- Organ / stage
- stemse0
- Treatment
- C1e0
- Outcome
- N uptake and regulatory capabilitiese0
- Direction
- enhancemente0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As the soil salt stress increased from the control treatment to C1, the cotton stems and fruits demonstrated a gradual enhancement in their N uptake and regulatory capabilities, albeit with a slight decrease observed in the leaves.”
Claim · model-written summary
From control to C1 salinity, fruit nitrogen uptake and regulation rose.
- Taxon
- cottonGossypium hirsutume0
- Organ / stage
- fruitse0
- Treatment
- C1e0
- Outcome
- N uptake and regulatory capabilitiese0
- Direction
- enhancemente0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As the soil salt stress increased from the control treatment to C1, the cotton stems and fruits demonstrated a gradual enhancement in their N uptake and regulatory capabilities, albeit with a slight decrease observed in the leaves.”
Claim · model-written summary
From control to C1 salinity, leaf nitrogen uptake and regulation decreased slightly.
- Taxon
- cottonGossypium hirsutume0
- Organ / stage
- leavese0
- Treatment
- C1e0
- Outcome
- N uptake and regulatory capabilitiese0
- Direction
- slight decreasee0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As the soil salt stress increased from the control treatment to C1, the cotton stems and fruits demonstrated a gradual enhancement in their N uptake and regulatory capabilities, albeit with a slight decrease observed in the leaves.”
The same questions in other papers
salinity · nutrient: content · Gossypium hirsutum (cotton)Positive and negative results
21 papers in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
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See all 27 papers →salinity · organism · Gossypium hirsutum (cotton)Results agree
1 paper in the same direction as this paper
- negative
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.