Abstract
One-week-old seedlings of sunflower (Helianthus annuusL. cv. Russian Mammoth) which were sown in artificially-lighted growth cabinets were subsequently exposed to 0.05 or 0.1 ppm SO2for 5 weeks. The plants were harvested at intervals of 7 days, and relative growth rate (RGR), net assimilation rate (NAR), leaf area ratio (LAR), leaf weight ratio (LWR) and specific leaf area (SLA) were obtained. No remarkable changes were caused by SO2exposure in the dry weight of stem, root and whole plant. However, the leaf area and the leaf dry weight of plants exposed to 0.05 and 0.1 ppm SO2were markedly increased from harvesting on the 3rd week (2 weeks' exposure) . Exposure to 0.1 ppm SO2resulted in 20-25% reduction of NAR during the later stage (4 to 6 weeks), whereas RGR was slightly decreased. Exposure to 0.05 and 0.1 ppm SO2 caused the increase in LAR and LWR but not SLA. Same treatments also brought about the acceleration of leaf senescence and the depression of flower bud development and stem elongation.
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Claims 10
Claim · model-written summary
SO2 exposure caused no remarkable change in stem, root or whole plant dry weight.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- SO2exposuree0
- Outcome
- dry weight of stem, root and whole plante0
- Direction
- No remarkable changese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No remarkable changes were caused by SO2exposure in the dry weight of stem, root and whole plant.”
t0“Sunflower”
Claim · model-written summary
Exposure to 0.05 ppm SO2 increased sunflower leaf area after two weeks.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- 0.05e0
- Outcome
- leaf areae0
- Direction
- markedly increasede0
- Qualifier
- 3rd week (2 weeks' exposure)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the leaf area and the leaf dry weight of plants exposed to 0.05 and 0.1 ppm SO2were markedly increased from harvesting on the 3rd week (2 weeks' exposure)”
t0“Sunflower”
Claim · model-written summary
Exposure to 0.1 ppm SO2 increased sunflower leaf dry weight after two weeks.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- 0.1 ppm SO2e0
- Outcome
- leaf dry weighte0
- Direction
- markedly increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the leaf area and the leaf dry weight of plants exposed to 0.05 and 0.1 ppm SO2were markedly increased from harvesting on the 3rd week (2 weeks' exposure)”
t0“Sunflower”
Claim · model-written summary
Exposure to 0.1 ppm SO2 reduced net assimilation rate by 20-25% later in growth.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- 0.1 ppm SO2e0
- Outcome
- NARe0
- Direction
- reductione0
- Value
- 20-25%e0
- Qualifier
- later stage (4 to 6 weeks)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to 0.1 ppm SO2resulted in 20-25% reduction of NAR during the later stage (4 to 6 weeks)”
t0“Sunflower”
Claim · model-written summary
Relative growth rate decreased slightly with 0.1 ppm SO2.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- RGRe0
- Direction
- slightly decreasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas RGR was slightly decreased.”
t0“Sunflower”
Claim · model-written summary
Exposure to 0.05 and 0.1 ppm SO2 increased LAR and LWR.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- 0.05 and 0.1 ppm SO2e0
- Outcome
- LAR and LWRe0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to 0.05 and 0.1 ppm SO2 caused the increase in LAR and LWR but not SLA.”
t0“Sunflower”
Claim · model-written summary
Exposure to 0.05 and 0.1 ppm SO2 did not increase SLA.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- 0.05 and 0.1 ppm SO2e0
- Outcome
- SLAe0
- Direction
- note0
- Qualifier
- but not SLAe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to 0.05 and 0.1 ppm SO2 caused the increase in LAR and LWR but not SLA.”
t0“Sunflower”
Claim · model-written summary
The same SO2 treatments accelerated leaf senescence.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Same treatmentse0
- Outcome
- leaf senescencee0
- Direction
- acceleratione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Same treatments also brought about the acceleration of leaf senescence and the depression of flower bud development and stem elongation.”
t0“Sunflower”
Claim · model-written summary
The same SO2 treatments depressed flower bud development.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Same treatmentse0
- Outcome
- flower bud developmente0
- Direction
- depressione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Same treatments also brought about the acceleration of leaf senescence and the depression of flower bud development and stem elongation.”
t0“Sunflower”
Claim · model-written summary
The same SO2 treatments depressed stem elongation.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Same treatmentse0
- Outcome
- stem elongatione0
- Direction
- depressione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Same treatments also brought about the acceleration of leaf senescence and the depression of flower bud development and stem elongation.”
t0“Sunflower”
The same questions in other papers
pollution · growth · Helianthus annuus (common sunflower)Positive and negative results
2 in the opposite direction
- 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.