Abstract
Recently air pollution caused by photochemical oxidants has produced the very serious subjects, because of a wideness of their polluted area and being injurious to many crop plants. The experiments were carried out to elucidate the effect of ozone on apparent photosynthesis during and after the exposure to ozone and the visible injuries to corn, rice and peanut plants. Apparent photosynthesis of 3 kinds of plant used in this experiment decreased to a considerable extent when exposed to a higher concentration than 0.5 ppm, although a slight decrease was observed even at 0.1 ppm. Both photosynthesis rate by ozone and its extent lowered could be arranged on the following order, peanut>rice>corn plant; and the visible injury was also in the same order. Furthermore, it was investigated that whether the decrease in photosynthesis by ozone treatment is recovered or not, after the plants were released from the ozone. The photosynthesis of corn plant did not entirely recover for 2 hours after stop of ozone treatment, but that of rice plants showed a clear trend to recover. Photosynthesis of peanut plants did not recover but continued to decrease for 1 hour even after ozone treatment had been stopped. The photosynthesis in peanut plant decreased in proportion to the increase in the visible injury. 0n the other hand, visible injuries in the other species became apparent when photosynthesis decreased by 70% in the rice and 65% in the corn plants. From these results it was concluded that the degrees of invisible injury, judging from the photosynthetic rate influenced by ozone, were in the following order, rice>corn>peanut plants
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Claims 11
Claim · model-written summary
Apparent photosynthesis of corn, rice and peanut decreased markedly at ozone above 0.5 ppm.
- Taxon
- corn, rice and peanut plants
Arachis hypogaea
Oryza sativa
Zea mays subsp. mayse1 - Treatment
- higher concentration than 0.5 ppme0
- Outcome
- Apparent photosynthesise0
- Direction
- decreasede0
- Qualifier
- to a considerable extente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Apparent photosynthesis of 3 kinds of plant used in this experiment decreased to a considerable extent when exposed to a higher concentration than 0.5 ppm”
e1“the visible injuries to corn, rice and peanut plants”
Claim · model-written summary
A slight decrease in apparent photosynthesis was observed even at 0.1 ppm ozone.
- Taxon
- corn, rice and peanut plantsArachis hypogaeaOryza sativaZea mays subsp. mayse1
- Treatment
- 0.1 ppme2
- Outcome
- Apparent photosynthesise0
- Direction
- slight decreasee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Apparent photosynthesis of 3 kinds of plant used in this experiment decreased to a considerable extent when exposed to a higher concentration than 0.5 ppm”
e1“the visible injuries to corn, rice and peanut plants”
e2“although a slight decrease was observed even at 0.1 ppm”
Claim · model-written summary
Ozone-lowered photosynthesis rate and its extent followed the order peanut > rice > corn.
- Taxon
- corn, rice and peanut plantsArachis hypogaeaOryza sativaZea mays subsp. mayse1
- Treatment
- ozonee3
- Outcome
- photosynthesis rate by ozone and its extente3
- Direction
- lowerede3
- Qualifier
- peanut>rice>corn plante3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the visible injuries to corn, rice and peanut plants”
e3“Both photosynthesis rate by ozone and its extent lowered could be arranged on the following order, peanut>rice>corn plant”
Claim · model-written summary
Visible injury followed the same order: peanut > rice > corn.
- Taxon
- corn, rice and peanut plantsArachis hypogaeaOryza sativaZea mays subsp. mayse1
- Outcome
- visible injurye4
- Qualifier
- peanut>rice>corn plante3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the visible injuries to corn, rice and peanut plants”
e3“Both photosynthesis rate by ozone and its extent lowered could be arranged on the following order, peanut>rice>corn plant”
e4“the visible injury was also in the same order”
Claim · model-written summary
Photosynthesis of corn did not fully recover within 2 hours after ozone treatment stopped.
- Taxon
- corn plantZea mays subsp. mayse5
- Treatment
- ozone treatmente5
- Outcome
- photosynthesise5
- Direction
- did not entirely recovere5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The photosynthesis of corn plant did not entirely recover for 2 hours after stop of ozone treatment”
Claim · model-written summary
Photosynthesis of rice showed a clear trend to recover after ozone treatment stopped.
- Taxon
- rice plantsOryza sativae6
- Treatment
- ozone treatmente5
- Outcome
- photosynthesise5
- Direction
- showed a clear trend to recovere6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The photosynthesis of corn plant did not entirely recover for 2 hours after stop of ozone treatment”
e6“but that of rice plants showed a clear trend to recover”
Claim · model-written summary
Photosynthesis of peanut did not recover and kept decreasing for 1 hour after ozone treatment stopped.
- Taxon
- peanut plantsArachis hypogaeae7
- Treatment
- ozone treatmente7
- Outcome
- Photosynthesise7
- Direction
- continued to decreasee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Photosynthesis of peanut plants did not recover but continued to decrease for 1 hour even after ozone treatment had been stopped”
Claim · model-written summary
Peanut photosynthesis decreased in proportion to the increase in visible injury.
- Taxon
- peanut plantArachis hypogaeae0
- Outcome
- photosynthesise0
- Direction
- decreasede0
- Qualifier
- in proportion to the increase in the visible injurye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photosynthesis in peanut plant decreased in proportion to the increase in the visible injury”
Claim · model-written summary
Visible injuries appeared in rice when photosynthesis had decreased by 70%.
- Taxon
- riceOryza sativae0
- Outcome
- visible injuriese0
- Value
- 70%e0
- Qualifier
- photosynthesis decreased by 70%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“visible injuries in the other species became apparent when photosynthesis decreased by 70% in the rice and 65% in the corn plants”
Claim · model-written summary
Visible injuries appeared in corn when photosynthesis had decreased by 65%.
- Taxon
- corn plantsZea mays subsp. mayse0
- Outcome
- visible injuriese0
- Value
- 65%e0
- Qualifier
- 65% in the corn plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“visible injuries in the other species became apparent when photosynthesis decreased by 70% in the rice and 65% in the corn plants”
Claim · model-written summary
Degrees of invisible injury, judged from photosynthetic rate under ozone, ranked rice > corn > peanut.
- Taxon
- corn, rice and peanut plantsArachis hypogaeaOryza sativaZea mays subsp. mayse1
- Treatment
- influenced by ozonee2
- Outcome
- degrees of invisible injurye2
- Qualifier
- rice>corn>peanut plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the visible injuries to corn, rice and peanut plants”
e2“the degrees of invisible injury, judging from the photosynthetic rate influenced by ozone, were in the following order, rice>corn>peanut plants”
The same questions in other papers
ozone · physiology: photosynthesis · Oryza sativa (rice)Results differ
1 paper in the same direction as this paper · 27 in the opposite direction
- negative
- negative
- negative
25 papers more in this group
See all 29 papers →ozone · physiology: photosynthesis · Zea mays (maize)Positive and negative results
8 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
7 papers more in this group
See all 11 papers →ozone · physiology: photosynthesis · Arachis hypogaea (peanut)Results agree
1 paper in the same direction as this paper
- 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.