Abstract
Treatment of 4-day-old cucumber (Cucumis sativus L.) seedlings with PbCl2 or CdCl2 caused a significant increase in the accumulation of heavy metals by the plants, especially in the roots. The accumulated Pb initially enhanced the uptake of phosphorous after the plants had been transferred to a nutrient medium (6, 24 hrs), but after only 48 Ins the uptake had dropped to below control level. The plants treated with Cd exhibited a constant decreased phosphorous uptake level. The accumulated lead and cadmium also inhibited nitrate uptake and the activity of nitrate reductase. It is suggested that the reason for the decreased nitrate reductase activity lay rather in the lower nitrate uptake than in a direct effect of the heavy metals on the enzyme.
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Claims 8
Claim · model-written summary
PbCl2 significantly increased heavy metal accumulation in cucumber seedlings, especially in roots
- Taxon
- cucumber
Cucumis sativuse1 - Organ / stage
- rootse1
- Treatment
- PbCl2e0
- Outcome
- accumulation of heavy metalse1
- Direction
- significant increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of 4-day-old cucumber (Cucumis sativus L.) seedlings with PbCl2 or CdCl2”
e1“Treatment of 4-day-old cucumber (Cucumis sativus L.) seedlings with PbCl2 or CdCl2 caused a significant increase in the accumulation of heavy metals by the plants, especially in the roots”
Claim · model-written summary
CdCl2 significantly increased heavy metal accumulation in cucumber seedlings, especially in roots
- Taxon
- cucumberCucumis sativuse1
- Organ / stage
- rootse1
- Treatment
- CdCl2e0
- Outcome
- accumulation of heavy metalse1
- Direction
- significant increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of 4-day-old cucumber (Cucumis sativus L.) seedlings with PbCl2 or CdCl2”
e1“Treatment of 4-day-old cucumber (Cucumis sativus L.) seedlings with PbCl2 or CdCl2 caused a significant increase in the accumulation of heavy metals by the plants, especially in the roots”
Claim · model-written summary
Accumulated Pb initially enhanced phosphorus uptake in cucumber seedlings at 6 and 24 hours
- Taxon
- cucumberCucumis sativuse0
- Treatment
- accumulated Pbe2
- Outcome
- uptake of phosphorouse2
- Direction
- enhancede2
- Qualifier
- 6, 24 hrse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of 4-day-old cucumber (Cucumis sativus L.) seedlings with PbCl2 or CdCl2”
e2“The accumulated Pb initially enhanced the uptake of phosphorous after the plants had been transferred to a nutrient medium (6, 24 hrs)”
Claim · model-written summary
After 48 hours, phosphorus uptake in Pb-accumulating cucumber seedlings dropped below control level
- Taxon
- cucumberCucumis sativuse0
- Treatment
- accumulated Pbe2
- Outcome
- uptakee3
- Direction
- dropped to belowe3
- Qualifier
- 48 Inse3
- Comparator
- control levele3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of 4-day-old cucumber (Cucumis sativus L.) seedlings with PbCl2 or CdCl2”
e2“The accumulated Pb initially enhanced the uptake of phosphorous after the plants had been transferred to a nutrient medium (6, 24 hrs)”
e3“but after only 48 Ins the uptake had dropped to below control level”
Claim · model-written summary
Cd-treated cucumber seedlings showed a constant decrease in phosphorus uptake level
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Cde4
- Outcome
- phosphorous uptake levele4
- Direction
- decreasede4
- Qualifier
- constante4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of 4-day-old cucumber (Cucumis sativus L.) seedlings with PbCl2 or CdCl2”
e4“The plants treated with Cd exhibited a constant decreased phosphorous uptake level”
Claim · model-written summary
Accumulated lead inhibited nitrate uptake and nitrate reductase activity in cucumber seedlings
- Taxon
- cucumberCucumis sativuse0
- Treatment
- accumulated leade5
- Outcome
- nitrate uptake and the activity of nitrate reductasee5
- Direction
- inhibitede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of 4-day-old cucumber (Cucumis sativus L.) seedlings with PbCl2 or CdCl2”
e5“The accumulated lead and cadmium also inhibited nitrate uptake and the activity of nitrate reductase”
Claim · model-written summary
Cadmium inhibited nitrate uptake and nitrate reductase activity in cucumber seedlings
- Taxon
- cucumberCucumis sativuse0
- Treatment
- cadmiume5
- Outcome
- nitrate uptake and the activity of nitrate reductasee5
- Direction
- inhibitede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of 4-day-old cucumber (Cucumis sativus L.) seedlings with PbCl2 or CdCl2”
e5“The accumulated lead and cadmium also inhibited nitrate uptake and the activity of nitrate reductase”
Claim · model-written summary
The decrease in nitrate reductase activity is attributed to lower nitrate uptake rather than a direct metal effect on the enzyme
- Taxon
- cucumberCucumis sativuse0
- Outcome
- nitrate reductase activitye6
- Qualifier
- lower nitrate uptakee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of 4-day-old cucumber (Cucumis sativus L.) seedlings with PbCl2 or CdCl2”
e6“It is suggested that the reason for the decreased nitrate reductase activity lay rather in the lower nitrate uptake than in a direct effect of the heavy metals on the enzyme”
The same questions in other papers
lead atom · nutrient: content · Cucumis sativus (cucumber)Positive and negative results
2 in the opposite direction
- no effect
- negative
cadmium atom · nutrient: content · Cucumis sativus (cucumber)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
4 papers more in this group
See all 8 papers →cadmium atom · physiology: enzyme activity · Cucumis sativus (cucumber)Results agree
1 paper in the same direction as this paper
- no effect
lead atom · physiology: enzyme activity · Cucumis sativus (cucumber)Results agree
1 paper in the same direction as this paper
- no effect
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.