Abstract
This research investigated the effects of elevated ozone and carbon dioxide on photosynthesis of rice (Oryza sativa L.) cultivar Khao Dawk Mali 105. Seedlings were kept in indoor climate control chambers which were set to typically background level of ozone (<10 ppb) by passing inlet air from outside through charcoal filter prior to enter to the chambers. Plant samples were fumigated by ozone concentration level at 40 ppb, 70 ppb and carbon dioxide concentration level at 700 ppm. For combined effects, elevated carbon dioxide concentration 700 ppm was given into two combination treatments of ozone concentration level at 40 and 70 ppb. Control groups were grown in charcoal-filter chambers with no additional ozone. Plant samples then were fumigated with ozone and carbon dioxide for 28 days at tillering stage (at the rice age of 42 to 70 days), and analyzed weekly for photosynthesis rate, leaf chlorophyll, total soluble sugar and biomass. The results showed that ozone significantly caused reduction in photosynthesis, leaf chlorophyll, total soluble sugar and total biomass of rice. The ozone concentration level of 70 ppb significantly (p 0.05) affected rice more than 40 ppb treatment. Nevertheless, elevated carbon dioxide reduced the negative effects of ozone from both ozone concentration levels. Moreover, higher photosynthesis was observed in combined treatment, when compared with the control group. Finally, increasing of ozone caused reduction in rice photosynthesis; however, elevated carbon dioxide could significantly adverse the effects of ozone.
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Claims 4
Claim · model-written summary
Ozone reduced rice photosynthesis, leaf chlorophyll, soluble sugar and biomass.
- Taxon
- rice
Oryza sativae0 - Treatment
- ozonee0
- Outcome
- photosynthesis, leaf chlorophyll, total soluble sugar and total biomasse0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ozone significantly caused reduction in photosynthesis, leaf chlorophyll, total soluble sugar and total biomass of rice”
Claim · model-written summary
Ozone at 70 ppb affected rice more than ozone at 40 ppb.
- Taxon
- riceOryza sativae0
- Treatment
- ozone concentration level of 70 ppbe0
- Outcome
- affected rice moree0
- Direction
- moree0
- Comparator
- 40 ppb treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ozone concentration level of 70 ppb significantly (p 0.05) affected rice more than 40 ppb treatment”
Claim · model-written summary
Elevated carbon dioxide reduced the negative effects of ozone at both tested concentrations.
- Taxon
- riceOryza sativat0
- Treatment
- elevated carbon dioxidee0
- Outcome
- negative effects of ozonee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated carbon dioxide reduced the negative effects of ozone from both ozone concentration levels”
t0“rice”
Claim · model-written summary
Combined ozone and carbon dioxide treatment yielded higher photosynthesis than control.
- Taxon
- riceOryza sativat0
- Treatment
- combined treatmente0
- Outcome
- photosynthesise0
- Direction
- highere0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher photosynthesis was observed in combined treatment, when compared with the control group”
t0“rice”
The same questions in other papers
ozone · physiology: photosynthesis · Oryza sativa (rice)Results differ
26 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- negative
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See all 29 papers →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.