Abstract
Heavy metal toxicity in soils has been considered as major constraints for oilseed rape (Brassica napus L.) production. In the present study, toxic effects of chromium (Cr) were studied in 6-d-old seedlings of four different cultivars of B. napus (ZS 758, Zheda 619, ZY 50, and Zheda 622). The elevated content of Cr inhibited seedling growth, decreased the content of photosynthetic pigments, and activities of antioxidant enzymes, as well as increased the content of malondialdehyde and reactive oxygen species in all the cultivars. The Cr content in different parts of plants was higher in Zheda 622 than in other cultivars. The electron microscopic study showed changes in ultrastructure of leaf mesophyll and root tip cells at 400 μmol Cr, and these changes were more prominent in Zheda 622. An increased size and number of starch grains and number of plastoglobuli, damaged thylakoid membranes, and immature nucleoli and mitochondria were observed in leaves. In roots, enlarged vacuoles, disrupted cell walls and cell membranes, an increased number of mitochondria and a size of nucleolus, as well as plasmolysis (in Zheda 622) were observed. On the basis of these findings, it can be concluded that cv. Zheda 622 was more sensitive to Cr as compared to other three cultivars.
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Claims 8
Claim · model-written summary
Elevated chromium inhibited seedling growth in all four cultivars.
- Taxon
- oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse0 - Treatment
- Cre1
- Outcome
- seedling growthe1
- Direction
- inhibitede1
- Qualifier
- all the cultivarse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“oilseed rape (Brassica napus L.)”
e1“The elevated content of Cr inhibited seedling growth, decreased the content of photosynthetic pigments, and activities of antioxidant enzymes, as well as increased the content of malondialdehyde and reactive oxygen species in all the cultivars.”
Claim · model-written summary
Elevated chromium decreased photosynthetic pigment content and antioxidant enzyme activities.
- Taxon
- oilseed rapeBrassica napuse0
- Treatment
- Cre1
- Outcome
- content of photosynthetic pigments, and activities of antioxidant enzymese1
- Direction
- decreasede1
- Qualifier
- all the cultivarse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oilseed rape (Brassica napus L.)”
e1“The elevated content of Cr inhibited seedling growth, decreased the content of photosynthetic pigments, and activities of antioxidant enzymes, as well as increased the content of malondialdehyde and reactive oxygen species in all the cultivars.”
Claim · model-written summary
Elevated chromium increased malondialdehyde and reactive oxygen species content.
- Taxon
- oilseed rapeBrassica napuse0
- Treatment
- Cre1
- Outcome
- content of malondialdehyde and reactive oxygen speciese1
- Direction
- increasede1
- Qualifier
- all the cultivarse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oilseed rape (Brassica napus L.)”
e1“The elevated content of Cr inhibited seedling growth, decreased the content of photosynthetic pigments, and activities of antioxidant enzymes, as well as increased the content of malondialdehyde and reactive oxygen species in all the cultivars.”
Claim · model-written summary
Zheda 622 accumulated more chromium than the other cultivars.
- Taxon
- oilseed rapeBrassica napuse0
- Material
- Zheda 622e1
- Outcome
- Cr contente1
- Direction
- highere1
- Comparator
- other cultivarse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oilseed rape (Brassica napus L.)”
e1“The Cr content in different parts of plants was higher in Zheda 622 than in other cultivars.”
Claim · model-written summary
Chromium at 400 μmol altered leaf mesophyll and root tip ultrastructure, most prominently in Zheda 622.
- Taxon
- oilseed rapeBrassica napuse0
- Material
- Zheda 622e1
- Treatment
- 400 μmol Cre1
- Outcome
- changes in ultrastructure of leaf mesophyll and root tip cellse1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oilseed rape (Brassica napus L.)”
e1“changes in ultrastructure of leaf mesophyll and root tip cells at 400 μmol Cr, and these changes were more prominent in Zheda 622”
Claim · model-written summary
Chromium-treated leaves had enlarged and more numerous starch grains and plastoglobuli, damaged thylakoids, and immature nucleoli and mitochondria.
- Taxon
- oilseed rapeBrassica napuse0
- Organ / stage
- leavese1
- Outcome
- increased size and number of starch grains and number of plastoglobuli, damaged thylakoid membranes, and immature nucleoli and mitochondriae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oilseed rape (Brassica napus L.)”
e1“An increased size and number of starch grains and number of plastoglobuli, damaged thylakoid membranes, and immature nucleoli and mitochondria were observed in leaves.”
Claim · model-written summary
Chromium-treated roots showed enlarged vacuoles, disrupted walls and membranes, more mitochondria, enlarged nucleoli and, in Zheda 622, plasmolysis.
- Taxon
- oilseed rapeBrassica napuse0
- Material
- Zheda 622e1
- Organ / stage
- rootse1
- Outcome
- enlarged vacuoles, disrupted cell walls and cell membranes, an increased number of mitochondria and a size of nucleolus, as well as plasmolysise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oilseed rape (Brassica napus L.)”
e1“In roots, enlarged vacuoles, disrupted cell walls and cell membranes, an increased number of mitochondria and a size of nucleolus, as well as plasmolysis (in Zheda 622) were observed.”
Claim · model-written summary
The authors judged Zheda 622 more chromium sensitive than the other three cultivars.
- Taxon
- oilseed rapeBrassica napuse0
- Material
- Zheda 622e1
- Outcome
- sensitive to Cre1
- Direction
- more sensitivee1
- Comparator
- other three cultivarse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oilseed rape (Brassica napus L.)”
e1“cv. Zheda 622 was more sensitive to Cr as compared to other three cultivars”
The same questions in other papers
chromium atom · physiology: photosynthesis · Brassica napus (oilseed rape)Positive and negative results
1 in the opposite direction
- positive
chromium atom · growth · Brassica napus (oilseed rape)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
chromium atom · physiology: oxidative · Brassica napus (oilseed rape)Results agree
4 papers in the same direction as this paper
- negative
- negative
- negative
1 paper more in this group
See all 5 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.