Abstract
The effects of cadmium(Cd)(5,15,30 mg·L-1)on chlorophyll levels and photosynthesis of cauliflower(Brassica oleracea L.var.botrytis)were studied under different concentrations of Cd using hydroponics system.Meanwhile,the differential centrifugation techniques and sequential extraction methods were used to determine the subcellular distribution and chemical form of Cd in leaves.Cd contents in different parts of plant were also measured after harvest.The results showed that,after different contents of Cd were supplied for two weeks,except intercellular CO2 concentration(Ci),the levels of chlorophyll a and b,net photosynthesis rate(Pn),stomatal conductance(Gs)and transpiration rate(Tr)all decreased significantly compared with the control.For the leaves,Cd was mainly distributed in the fractions of cytoplasm(70.19%-74.40%)and cell wall(22.56%-27.12%),and less distributed in the fractions of mitochondrion and chloroplast(0.90%-2.49%).The sequential extraction results of Cd in leaves indicated that NaCl extractable Cd was predominated(33%-39%),and the distribution of six Cd forms in leaves was as following:F NaCl FH2O FHAC FAlcohol FHCl FResidue.Most of Cd absorbed by plant was accumulated in roots,little of them was transported to the aboveground portions.The order of Cd accumulation in different plant parts was:rootsstems,leavesflowers.
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Claims 10
Claim · model-written summary
Cadmium exposure significantly decreased chlorophyll a and b levels in cauliflower relative to the control.
- Taxon
- Cauliflower
Brassica oleracea var. botrytist0 - Treatment
- Cde0
- Outcome
- the levels of chlorophyll a and be0
- Direction
- decreasede0
- Qualifier
- for two weekse0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after different contents of Cd were supplied for two weeks,except intercellular CO2 concentration(Ci),the levels of chlorophyll a and b,net photosynthesis rate(Pn),stomatal conductance(Gs)and transpiration rate(Tr)all decreased significantly compared with the control”
t0“Cauliflower”
Claim · model-written summary
Cadmium exposure significantly decreased net photosynthesis rate, stomatal conductance and transpiration rate in cauliflower relative to the control.
- Taxon
- CauliflowerBrassica oleracea var. botrytist0
- Treatment
- Cde0
- Outcome
- net photosynthesis rate(Pn),stomatal conductance(Gs)and transpiration rate(Tr)e0
- Direction
- decreasede0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after different contents of Cd were supplied for two weeks,except intercellular CO2 concentration(Ci),the levels of chlorophyll a and b,net photosynthesis rate(Pn),stomatal conductance(Gs)and transpiration rate(Tr)all decreased significantly compared with the control”
t0“Cauliflower”
Claim · model-written summary
Intercellular CO2 concentration was the exception to the significant decreases under cadmium exposure.
- Taxon
- CauliflowerBrassica oleracea var. botrytist0
- Treatment
- Cde0
- Outcome
- intercellular CO2 concentration(Ci)e0
- Comparator
- the controle0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after different contents of Cd were supplied for two weeks,except intercellular CO2 concentration(Ci),the levels of chlorophyll a and b,net photosynthesis rate(Pn),stomatal conductance(Gs)and transpiration rate(Tr)all decreased significantly compared with the control”
t0“Cauliflower”
Claim · model-written summary
Leaf cadmium was mainly in the cytoplasm fraction, at 70.19%-74.40%.
- Taxon
- CauliflowerBrassica oleracea var. botrytist0
- Organ / stage
- cytoplasme0
- Outcome
- Cd was mainly distributed in the fractions of cytoplasme0
- Value
- 70.19%-74.40%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd was mainly distributed in the fractions of cytoplasm(70.19%-74.40%)and cell wall(22.56%-27.12%),and less distributed in the fractions of mitochondrion and chloroplast(0.90%-2.49%)”
t0“Cauliflower”
Claim · model-written summary
Leaf cadmium in the cell wall fraction was 22.56%-27.12%.
- Taxon
- CauliflowerBrassica oleracea var. botrytist0
- Organ / stage
- cell walle0
- Outcome
- cell walle0
- Value
- 22.56%-27.12%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd was mainly distributed in the fractions of cytoplasm(70.19%-74.40%)and cell wall(22.56%-27.12%),and less distributed in the fractions of mitochondrion and chloroplast(0.90%-2.49%)”
t0“Cauliflower”
Claim · model-written summary
Leaf cadmium was less distributed in mitochondrion and chloroplast fractions, at 0.90%-2.49%.
- Taxon
- CauliflowerBrassica oleracea var. botrytist0
- Organ / stage
- mitochondrion and chloroplaste0
- Outcome
- fractions of mitochondrion and chloroplaste0
- Value
- 0.90%-2.49%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd was mainly distributed in the fractions of cytoplasm(70.19%-74.40%)and cell wall(22.56%-27.12%),and less distributed in the fractions of mitochondrion and chloroplast(0.90%-2.49%)”
t0“Cauliflower”
Claim · model-written summary
NaCl extractable cadmium predominated among leaf cadmium forms at 33%-39%.
- Taxon
- CauliflowerBrassica oleracea var. botrytist0
- Outcome
- NaCl extractable Cde0
- Direction
- predominatede0
- Value
- 33%-39%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl extractable Cd was predominated(33%-39%)”
t0“Cauliflower”
Claim · model-written summary
The reported ranking of six leaf cadmium forms was F NaCl FH2O FHAC FAlcohol FHCl FResidue.
- Taxon
- CauliflowerBrassica oleracea var. botrytist0
- Outcome
- distribution of six Cd forms in leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the distribution of six Cd forms in leaves was as following:F NaCl FH2O FHAC FAlcohol FHCl FResidue”
t0“Cauliflower”
Claim · model-written summary
Most absorbed cadmium accumulated in roots, with little transported aboveground.
- Taxon
- CauliflowerBrassica oleracea var. botrytist0
- Organ / stage
- rootse0
- Outcome
- Cd absorbed by plante0
- Direction
- Moste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most of Cd absorbed by plant was accumulated in roots,little of them was transported to the aboveground portions”
t0“Cauliflower”
Claim · model-written summary
The reported cadmium accumulation order among cauliflower parts was rootsstems,leavesflowers.
- Taxon
- CauliflowerBrassica oleracea var. botrytist0
- Outcome
- Cd accumulation in different plant partse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The order of Cd accumulation in different plant parts was:rootsstems,leavesflowers”
t0“Cauliflower”
The same questions in other papers
cadmium atom · physiology: photosynthesis · Brassica oleracea (wild cabbage)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
cadmium atom · physiology: pigments · Brassica oleracea (wild cabbage)Results agree
3 papers in the same direction as this paper
- negative
- negative
- 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.