Abstract
Abstract Effects of different concentrations of copper in nutrient solutions (0.02, 0.04, 0.08, 0.16, 0.32, and 0.64 ppm) on the composition and anatomy of tobacco plants were studied. Plants grown with 0.32 and 0.64 ppm Cu showed external chlorotic symptoms and internal toxic effects about 8–10 days after the start of the treatments, while plants grown on Cu concentrations of up to 0.16 ppm displayed no toxic malformations. Increasing concentrations of Cu .in the nutrient solutions were associated with the accumulation of Cu in the roots but not in the aerial portion of the plant. Dry weights of tops and roots were highest at the 0.04‐ and 0.08‐ppm Cu and lowest at the 0.32‐ and 0.64‐ppm treatments. Toxic Cu concentrations were associated with abnormal cellular growth and development throughout the plant. Primary roots developed short, thick, closely‐spaced lateral roots. Hypertrophy of the internal and external phloem resulted in crushed cells with a subsequent necrosis in the phloem. Cells in the xylem tissue were occluded or collapsed with irregularly shaped walls. Palisade and spongy parenchyraa cells of the leaves were deranged with very few chloroplasts. Cellular disintegration also occurred in this region.
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Claims 9
Claim · model-written summary
Tobacco grown with 0.32 and 0.64 ppm Cu showed external chlorosis and internal toxic effects, whereas up to 0.16 ppm Cu caused no toxic malformations.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Treatment
- 0.32 and 0.64 ppm Cue1
- Outcome
- external chlorotic symptoms and internal toxic effectse1
- Comparator
- Cu concentrations of up to 0.16 ppme1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plants grown with 0.32 and 0.64 ppm Cu showed external chlorotic symptoms and internal toxic effects about 8–10 days after the start of the treatments, while plants grown on Cu concentrations of up to 0.16 ppm displayed no toxic malformations”
t0“Tobacco”
Claim · model-written summary
Tobacco dry weights of tops and roots were highest at 0.04 and 0.08 ppm Cu.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- 0.04‐ and 0.08‐ppm Cue3
- Outcome
- Dry weights of tops and rootse3
- Direction
- higheste3
- Comparator
- 0.32‐ and 0.64‐ppm treatmentse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Dry weights of tops and roots were highest at the 0.04‐ and 0.08‐ppm Cu and lowest at the 0.32‐ and 0.64‐ppm treatments”
t0“Tobacco”
Claim · model-written summary
Tobacco dry weights of tops and roots were lowest at 0.32 and 0.64 ppm Cu.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- 0.32‐ and 0.64‐ppm treatmentse3
- Outcome
- Dry weights of tops and rootse3
- Direction
- loweste3
- Comparator
- 0.04‐ and 0.08‐ppm Cue3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Dry weights of tops and roots were highest at the 0.04‐ and 0.08‐ppm Cu and lowest at the 0.32‐ and 0.64‐ppm treatments”
t0“Tobacco”
Claim · model-written summary
Primary roots of tobacco developed short, thick lateral roots under Cu toxicity.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- Primary rootse4
- Outcome
- lateral rootse4
- Qualifier
- short, thicke4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Primary roots developed short, thick, closely‐spaced lateral roots”
t0“Tobacco”
Claim · model-written summary
Toxic Cu concentrations were associated with abnormal cellular growth and development throughout tobacco plants.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Toxic Cu concentrationse5
- Outcome
- abnormal cellular growth and developmente5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Toxic Cu concentrations were associated with abnormal cellular growth and development throughout the plant”
t0“Tobacco”
Claim · model-written summary
Hypertrophy of the internal and external phloem caused crushed cells and necrosis in the phloem of tobacco.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- internal and external phloeme6
- Outcome
- crushed cells with a subsequent necrosis in the phloeme6
- Qualifier
- Hypertrophy of the internal and external phloeme6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Hypertrophy of the internal and external phloem resulted in crushed cells with a subsequent necrosis in the phloem”
t0“Tobacco”
Claim · model-written summary
Xylem cells of tobacco were occluded or collapsed with irregularly shaped walls.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- xylem tissuee7
- Outcome
- occluded or collapsede7
- Qualifier
- with irregularly shaped wallse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Cells in the xylem tissue were occluded or collapsed with irregularly shaped walls”
t0“Tobacco”
Claim · model-written summary
Palisade and spongy parenchyma cells of tobacco leaves were deranged with very few chloroplasts.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- Palisade and spongy parenchyraa cellse1
- Outcome
- deranged with very few chloroplastse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Palisade and spongy parenchyraa cells of the leaves were deranged with very few chloroplasts”
t0“Tobacco”
Claim · model-written summary
Cellular disintegration occurred in the leaves of tobacco under Cu toxicity.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- Cellular disintegratione1
- Qualifier
- also occurred in this regione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cellular disintegration also occurred in this region”
t0“Tobacco”
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3 papers in the same direction as this paper · 2 in the opposite direction
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See all 6 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.