Abstract
Contamination of agricultural soils with heavy metal leads to a decrease in the crop quality and yield, as well as increases in public health risks. In this study, we aimed to evaluate the impact of soil contamination with lead (Pb) on the growth, photosynthesis, respiration, and coupling between these physiological processes, as well as temporal dynamics of Pb uptake and accumulation by lettuce (Lactuca sativa L.) plants. For this 46-day pot experiment, Pb(NO3)2 was mixed with loamy Retisol soil with the rate of 0, 50, and 250 mg kg−1. No significant differences in plant biomass accumulation were found between plants grown on Pb-free and Pb-rich soil, but root-weight ratio, root-to-shoot weight ratio, and leaf area were lower, and the number of leaves and leaf weight per unit area were significantly higher in plants grown on soil contaminated with Pb than in their counterparts grown on Pb-free soil. The concentration of Pb in plant root and shoot followed the increase in soil Pb, with Pb content in the roots being higher than in the shoots. Soil Pb decreased chlorophyll content, net CO2 assimilation rate and photosynthetic light use efficiency, but caused an increase in the leaf respiration rate regardless of whether respiration was performed in the light or in darkness. Increased ratio of respiration to photosynthesis reflects the shift in the carbon balance of lettuce plants toward carbon losses under stress conditions of soil contamination with Pb.
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Claims 8
Claim · model-written summary
Pb-rich soil did not significantly change lettuce plant biomass accumulation compared with Pb-free soil
- Taxon
- Lettuce
Lactuca sativat0 - Treatment
- Pb-rich soile1
- Outcome
- plant biomass accumulatione1
- Direction
- no_changeinferrede1
- Comparator
- Pb-freee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Responses of Lettuce (Lactuca sativa L.)”
e1“No significant differences in plant biomass accumulation were found between plants grown on Pb-free and Pb-rich soil”
Claim · model-written summary
Soil Pb lowered root-weight ratio, root-to-shoot weight ratio and leaf area in lettuce
- Taxon
- LettuceLactuca sativat0
- Treatment
- soil contaminated with Pbe5
- Outcome
- root-weight ratio, root-to-shoot weight ratio, and leaf areae2
- Direction
- lowere2
- Comparator
- Pb-free soile3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Responses of Lettuce (Lactuca sativa L.)”
e2“root-weight ratio, root-to-shoot weight ratio, and leaf area were lower”
e3“than in their counterparts grown on Pb-free soil”
e5“grown on soil contaminated with Pb”
Claim · model-written summary
Soil Pb significantly increased leaf number and leaf weight per unit area in lettuce
- Taxon
- LettuceLactuca sativat0
- Treatment
- soil contaminated with Pbe5
- Outcome
- number of leaves and leaf weight per unit areae4
- Direction
- significantly highere4
- Comparator
- Pb-free soile3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Responses of Lettuce (Lactuca sativa L.)”
e4“the number of leaves and leaf weight per unit area were significantly higher”
e3“than in their counterparts grown on Pb-free soil”
e5“grown on soil contaminated with Pb”
Claim · model-written summary
Pb concentration in lettuce root and shoot increased with soil Pb
- Taxon
- LettuceLactuca sativat0
- Organ / stage
- root and shoote6
- Treatment
- increase in soil Pbe6
- Outcome
- concentration of Pb in plant root and shoote6
- Direction
- increaseinferrede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Responses of Lettuce (Lactuca sativa L.)”
e6“The concentration of Pb in plant root and shoot followed the increase in soil Pb, with Pb content in the roots being higher than in the shoots”
Claim · model-written summary
Pb content was higher in lettuce roots than in shoots
- Taxon
- LettuceLactuca sativat0
- Organ / stage
- rootse6
- Outcome
- Pb content in the rootse6
- Direction
- highere6
- Comparator
- shootse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Responses of Lettuce (Lactuca sativa L.)”
e6“The concentration of Pb in plant root and shoot followed the increase in soil Pb, with Pb content in the roots being higher than in the shoots”
Claim · model-written summary
Soil Pb decreased chlorophyll content, net CO2 assimilation rate and photosynthetic light use efficiency in lettuce
- Taxon
- LettuceLactuca sativat0
- Treatment
- Soil Pbe7
- Outcome
- chlorophyll content, net CO2 assimilation rate and photosynthetic light use efficiencye7
- Direction
- decreasede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Responses of Lettuce (Lactuca sativa L.)”
e7“Soil Pb decreased chlorophyll content, net CO2 assimilation rate and photosynthetic light use efficiency”
Claim · model-written summary
Soil Pb increased leaf respiration rate in lettuce in both light and darkness
- Taxon
- LettuceLactuca sativat0
- Treatment
- Soil Pbe7
- Outcome
- leaf respiration ratee0
- Direction
- increasee0
- Qualifier
- regardless of whether respiration was performed in the light or in darknesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Responses of Lettuce (Lactuca sativa L.)”
e7“Soil Pb decreased chlorophyll content, net CO2 assimilation rate and photosynthetic light use efficiency”
e0“caused an increase in the leaf respiration rate regardless of whether respiration was performed in the light or in darkness”
Claim · model-written summary
Increased ratio of respiration to photosynthesis in lettuce under soil Pb contamination reflects a shift toward carbon losses
- Taxon
- LettuceLactuca sativat0
- Treatment
- soil contamination with Pbe0
- Outcome
- ratio of respiration to photosynthesise0
- Direction
- Increasede0
- Qualifier
- shift in the carbon balance of lettuce plants toward carbon lossese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Responses of Lettuce (Lactuca sativa L.)”
e0“Increased ratio of respiration to photosynthesis reflects the shift in the carbon balance of lettuce plants toward carbon losses under stress conditions of soil contamination with Pb”
The same questions in other papers
lead atom · growth · Lactuca sativa (garden lettuce)Results differ
7 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- positive
7 papers more in this group
See all 11 papers →lead atom · physiology: photosynthesis · Lactuca sativa (garden lettuce)Results agree
3 papers in the same direction as this paper
- negative
- negative
- 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.