Abstract
Cadmium (Cd) is a toxic environmental contaminant that has been classified as a human carcinogen, and the area of contaminated farmland continuously expands. This study aims at studying the effects of Cd fortified in the soil on maize carbon and nitrogen in at different stages. A pot experiment with five Cd concentrations (0, 1, 4, 8 and 16 mg/kg) in soil was conducted. The major results can be concluded as follows: (1) High Cd doses (8 and 16 mg/kg) significantly decreased the concentrations of chlorophyll in leaves and nitrogen in stems, and increased the soluble sugar content in leaves and stems. Furthermore, the effects were enhanced with the increase of Cd dose and exposure time. (2) High Cd dose (8 and 16 mg/kg) can inhibit, or even reverse the transfer of soluble sugar and nitrogen from stems to seeds, which probably resulted in the decrease of yield and starch accumulation in the seeds. (3) The threshold value research suggested that maize is capable of absorbing Cd easily from the soil. When the Cd concentration was 1 mg/kg, the seeds cannot be used as food; when the Cd concentration was higher than 8 mg/kg, the straws cannot be used as the feed.
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Claims 11
Claim · model-written summary
High soil Cd doses decreased concentrations of chlorophyll in leaves.
- Organ / stage
- leavese0
- Treatment
- High Cd doses (8 and 16 mg/kg)e0
- Outcome
- concentrations of chlorophylle0
- Direction
- decreasede0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High Cd doses (8 and 16 mg/kg) significantly decreased the concentrations of chlorophyll in leaves and nitrogen in stems, and increased the soluble sugar content in leaves and stems.”
t0“maize (Zea mays L.)”
Claim · model-written summary
High soil Cd doses decreased nitrogen in stems.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High Cd doses (8 and 16 mg/kg) significantly decreased the concentrations of chlorophyll in leaves and nitrogen in stems, and increased the soluble sugar content in leaves and stems.”
t0“maize (Zea mays L.)”
Claim · model-written summary
High soil Cd doses increased soluble sugar content in leaves and stems.
- Organ / stage
- leaves and stemse0
- Treatment
- High Cd doses (8 and 16 mg/kg)e0
- Outcome
- soluble sugar contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High Cd doses (8 and 16 mg/kg) significantly decreased the concentrations of chlorophyll in leaves and nitrogen in stems, and increased the soluble sugar content in leaves and stems.”
t0“maize (Zea mays L.)”
Claim · model-written summary
The Cd effects strengthened with dose and exposure time.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects were enhanced with the increase of Cd dose and exposure time.”
t0“maize (Zea mays L.)”
Claim · model-written summary
High soil Cd inhibited or reversed transfer of soluble sugar.
- Treatment
- High Cd dose (8 and 16 mg/kg)e0
- Outcome
- transfer of soluble sugare0
- Direction
- inhibit, or even reversee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High Cd dose (8 and 16 mg/kg) can inhibit, or even reverse the transfer of soluble sugar and nitrogen from stems to seeds, which probably resulted in the decrease of yield and starch accumulation in the seeds.”
t0“maize (Zea mays L.)”
Claim · model-written summary
High soil Cd inhibited or reversed nitrogen from stems to seeds.
- Treatment
- High Cd dose (8 and 16 mg/kg)e0
- Outcome
- nitrogen from stems to seedse0
- Direction
- inhibit, or even reversee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High Cd dose (8 and 16 mg/kg) can inhibit, or even reverse the transfer of soluble sugar and nitrogen from stems to seeds, which probably resulted in the decrease of yield and starch accumulation in the seeds.”
t0“maize (Zea mays L.)”
Claim · model-written summary
The altered transfer probably decreased yield.
- Outcome
- yielde0
- Direction
- decreasee0
- Qualifier
- transfer of soluble sugar and nitrogen from stems to seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High Cd dose (8 and 16 mg/kg) can inhibit, or even reverse the transfer of soluble sugar and nitrogen from stems to seeds, which probably resulted in the decrease of yield and starch accumulation in the seeds.”
t0“maize (Zea mays L.)”
Claim · model-written summary
The altered transfer probably decreased starch accumulation in the seeds.
- Outcome
- starch accumulation in the seedse0
- Direction
- decreasee0
- Qualifier
- transfer of soluble sugar and nitrogen from stems to seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High Cd dose (8 and 16 mg/kg) can inhibit, or even reverse the transfer of soluble sugar and nitrogen from stems to seeds, which probably resulted in the decrease of yield and starch accumulation in the seeds.”
t0“maize (Zea mays L.)”
Claim · model-written summary
Maize readily absorbs Cd from soil.
- Outcome
- absorbing Cde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize is capable of absorbing Cd easily from the soil.”
Claim · model-written summary
At the stated soil Cd concentration, seeds cannot be used as food.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the Cd concentration was 1 mg/kg, the seeds cannot be used as food;”
t0“maize (Zea mays L.)”
Claim · model-written summary
At the stated soil Cd concentration, straws cannot be used as the feed.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when the Cd concentration was higher than 8 mg/kg, the straws cannot be used as the feed.”
t0“maize (Zea mays L.)”
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See all 46 papers →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.