Abstract
Abstract The effect of soil contamination with lead (50 and 250 mg Pb2+ per 1 kg of dry soil weight) on the rate of photosynthetic assimilation of CO2 (An), the content of major macronutrients in leaves, photosynthetic use efficiency of nitrogen (PNUE), phosphorus (PPUE), potassium (PKUE), water (PWUE), and light (α) in lettuce plants of the variety Medvezhye Ushko was studied under controlled environmental conditions. A negative effect of the metal ion on photosynthetic rate An was revealed, which was associated with the decreases in chlorophyll content, PNUE, PPUE, PKUE, and the α value. The quantum efficiency of PSII reaction (Fv/Fm) decreased but still remained within the range typical of photosystem normal functioning. No pronounced influence of lead on the content of macronutrients in plant leaves was found. In Pb-treated plants, the decrease in PNUE, PPUE, and PKUE was accompanied by the increase in leaf mass to leaf area ratio, which reflects close structural and functional relationships during plant adaptation to stressful conditions of heavy-metal soil pollution. It was shown that lead, even in the highest concentration applied (250 mg/kg soil), affected neither the transpiration rate nor the photosynthetic water use efficiency in plants.
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Claims 8
Claim · model-written summary
Lead reduced lettuce photosynthetic rate An.
- Taxon
- Lactuca sativa (L.)
Lactuca sativat0 - Treatment
- metal ione0
- Outcome
- photosynthetic rate Ane0
- Direction
- negative effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A negative effect of the metal ion on photosynthetic rate An was revealed, which was associated with the decreases in chlorophyll content, PNUE, PPUE, PKUE, and the α value.”
t0“Lactuca sativa (L.)”
Claim · model-written summary
Lead reduced lettuce chlorophyll content.
- Taxon
- Lactuca sativa (L.)Lactuca sativat0
- Treatment
- metal ione0
- Outcome
- chlorophyll contente0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A negative effect of the metal ion on photosynthetic rate An was revealed, which was associated with the decreases in chlorophyll content, PNUE, PPUE, PKUE, and the α value.”
t0“Lactuca sativa (L.)”
Claim · model-written summary
Lead reduced lettuce PNUE, PPUE, PKUE.
- Taxon
- Lactuca sativa (L.)Lactuca sativat0
- Treatment
- metal ione0
- Outcome
- PNUE, PPUE, PKUEe0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A negative effect of the metal ion on photosynthetic rate An was revealed, which was associated with the decreases in chlorophyll content, PNUE, PPUE, PKUE, and the α value.”
t0“Lactuca sativa (L.)”
Claim · model-written summary
Lead reduced lettuce α value.
- Taxon
- Lactuca sativa (L.)Lactuca sativat0
- Treatment
- metal ione0
- Outcome
- α valuee0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A negative effect of the metal ion on photosynthetic rate An was revealed, which was associated with the decreases in chlorophyll content, PNUE, PPUE, PKUE, and the α value.”
t0“Lactuca sativa (L.)”
Claim · model-written summary
Lettuce PSII quantum efficiency decreased while remaining in the normal range.
- Taxon
- Lactuca sativa (L.)Lactuca sativat0
- Outcome
- quantum efficiency of PSII reaction (Fv/Fm)e0
- Direction
- decreasede0
- Qualifier
- within the range typical of photosystem normal functioninge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The quantum efficiency of PSII reaction (Fv/Fm) decreased but still remained within the range typical of photosystem normal functioning.”
t0“Lactuca sativa (L.)”
Claim · model-written summary
Lead had no pronounced influence on lettuce leaf macronutrient content.
- Taxon
- Lactuca sativa (L.)Lactuca sativat0
- Organ / stage
- plant leavese0
- Treatment
- leade0
- Outcome
- content of macronutrients in plant leavese0
- Direction
- No pronounced influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No pronounced influence of lead on the content of macronutrients in plant leaves was found.”
t0“Lactuca sativa (L.)”
Claim · model-written summary
Reduced nutrient use efficiencies accompanied increased lettuce leaf mass to area ratio under Pb treatment.
- Taxon
- Lactuca sativa (L.)Lactuca sativat0
- Treatment
- Pb-treatede0
- Outcome
- leaf mass to leaf area ratioe0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Pb-treated plants, the decrease in PNUE, PPUE, and PKUE was accompanied by the increase in leaf mass to leaf area ratio, which reflects close structural and functional relationships during plant adaptation to stressful conditions of heavy-metal soil pollution.”
t0“Lactuca sativa (L.)”
Claim · model-written summary
Lead at up to 250 mg/kg soil did not affect lettuce transpiration rate or photosynthetic water use efficiency.
- Taxon
- Lactuca sativa (L.)Lactuca sativat0
- Treatment
- leade0
- Outcome
- transpiration rate nor the photosynthetic water use efficiencye0
- Direction
- affected neithere0
- Qualifier
- 250 mg/kg soile0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It was shown that lead, even in the highest concentration applied (250 mg/kg soil), affected neither the transpiration rate nor the photosynthetic water use efficiency in plants.”
t0“Lactuca sativa (L.)”
The same questions in other papers
lead atom · molecular: metabolites · Lactuca sativa (garden lettuce)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- negative
lead atom · physiology: photosynthesis · Lactuca sativa (garden lettuce)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.