Abstract
Abstract Detached corn and sunflower leaves supplied with PbCl 2 via the transpiration stream exhibited reduced rates of photosynthesis. The difference between species in the amount of Pb taken up was in direct proportion to their respective transpiration rates. For both species the reduction in photosynthesis and the amount of Pb taken up increased with increasing treatment concentrations. A corresponding reduction occurred in the rate of transpiration suggesting that stomatal resistance may be increased by Pb contamination. The pathways of CO 2 and water vapor exchange are discussed in relation to the effects of Pb on photosynthesis and transpiration.
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Claims 7
Claim · model-written summary
PbCl2 supplied via the transpiration stream reduced the rate of photosynthesis in detached corn leaves.
- Taxon
- corn
Zea mays subsp. mayse1 - Organ / stage
- leavese1
- Treatment
- PbCl 2 via the transpiration streame1
- Outcome
- rates of photosynthesise1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Detached corn and sunflower leaves supplied with PbCl 2 via the transpiration stream exhibited reduced rates of photosynthesis”
Claim · model-written summary
PbCl2 supplied via the transpiration stream reduced the rate of photosynthesis in detached sunflower leaves.
- Taxon
- sunflower
Helianthus annuuse1 - Organ / stage
- leavese1
- Treatment
- PbCl 2 via the transpiration streame1
- Outcome
- rates of photosynthesise1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Detached corn and sunflower leaves supplied with PbCl 2 via the transpiration stream exhibited reduced rates of photosynthesis”
Claim · model-written summary
In corn and sunflower, the reduction in photosynthesis increased with increasing Pb treatment concentration.
- Taxon
- corn and sunflowerHelianthus annuusZea mays subsp. mayse1
- Treatment
- increasing treatment concentrationse2
- Outcome
- reduction in photosynthesise2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Detached corn and sunflower leaves supplied with PbCl 2 via the transpiration stream exhibited reduced rates of photosynthesis”
e2“For both species the reduction in photosynthesis and the amount of Pb taken up increased with increasing treatment concentrations”
Claim · model-written summary
In corn and sunflower, the amount of Pb taken up increased with increasing Pb treatment concentration.
- Taxon
- corn and sunflowerHelianthus annuusZea mays subsp. mayse1
- Treatment
- increasing treatment concentrationse2
- Outcome
- the amount of Pb taken upe2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Detached corn and sunflower leaves supplied with PbCl 2 via the transpiration stream exhibited reduced rates of photosynthesis”
e2“For both species the reduction in photosynthesis and the amount of Pb taken up increased with increasing treatment concentrations”
Claim · model-written summary
The difference between corn and sunflower in Pb uptake was in direct proportion to their transpiration rates.
- Taxon
- corn and sunflowerHelianthus annuusZea mays subsp. mayse1
- Treatment
- PbCl 2 via the transpiration streame1
- Outcome
- amount of Pb taken upe2
- Direction
- in direct proportione2
- Qualifier
- to their respective transpiration ratese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Detached corn and sunflower leaves supplied with PbCl 2 via the transpiration stream exhibited reduced rates of photosynthesis”
e2“The difference between species in the amount of Pb taken up was in direct proportion to their respective transpiration rates”
Claim · model-written summary
Pb contamination reduced the rate of transpiration in corn and sunflower.
- Taxon
- corn and sunflowerHelianthus annuusZea mays subsp. mayse1
- Treatment
- Pb contaminatione2
- Outcome
- rate of transpiratione2
- Direction
- reductione2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Detached corn and sunflower leaves supplied with PbCl 2 via the transpiration stream exhibited reduced rates of photosynthesis”
e2“A corresponding reduction occurred in the rate of transpiration suggesting that stomatal resistance may be increased by Pb contamination”
Claim · model-written summary
Pb contamination may reduce transpiration in corn and sunflower by increasing stomatal resistance.
- Taxon
- corn and sunflowerHelianthus annuusZea mays subsp. mayse1
- Treatment
- Pb contaminatione2
- Outcome
- rate of transpiratione2
- Qualifier
- stomatal resistance may be increasede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Detached corn and sunflower leaves supplied with PbCl 2 via the transpiration stream exhibited reduced rates of photosynthesis”
e2“A corresponding reduction occurred in the rate of transpiration suggesting that stomatal resistance may be increased by Pb contamination”
The same questions in other papers
lead atom · physiology: gas exchange · Helianthus annuus (common sunflower)Results agree
1 paper in the same direction as this paper
- negative
lead atom · physiology: gas exchange · Zea mays (maize)Results agree
2 papers in the same direction as this paper
- negative
- negative
heavy metal · physiology: gas exchange · Zea mays (maize)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 papers →heavy metal · physiology: gas exchange · Helianthus annuus (common sunflower)Results agree
3 papers in the same direction as this paper
- negative
- no effect
- 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.