Abstract
This research aimed to study the effects of chitosan on physiology, photosynthesis and biomass of rice cultivar RD47 under elevated ozone. Rice samples were grown at indoor climate controlled chambers, allowing the inlet air to pass through charcoal filters. For combined effects of chitosan and ozone, rice was soaked and sprayed with chitosan 0.05% (W/V) under elevated ozone concentration at 40 ppb (Chi+EO 3 40) and 70 ppb (Chi+EO 3 70). Control groups (CF) with no additional ozone were also studied. Samples were analyzed weekly for tiller number per plants, leaf area, leaf chlorophyll, photosynthesis, shoot biomass, root biomass and total biomass. The results obviously showed that ozone at the concentration of both 40 and 70 ppb caused negative effects on rice physiology, photosynthesis and biomass. The 70 ppb concentration, particularly, caused sever damage. Whilst soaking and spraying with chitosan could significantly reduce the harmful effects of ozone compared with the control group. For the samples soaked and sprayed with chitosan under elevated ozone for 21 days, Chi+EO 3 40 and Chi+EO 3 70 significantly performed more photosynthesis and contained more leaf chlorophyll than EO 3 40 and EO 3 70, respectively (p 0.05). In addition, chitosan could reduce the ozone negative effects and increased higher physiology and photosynthesis rate. However, there was no significant difference in biomass compared with the control group. Even through, ozone has been gradually increasing which made plants at risk, chitosan treatment could significantly ameliorate the effect of ozone and serve as a plant growth promoter with no harmful to human being.
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Claims 8
Claim · model-written summary
Ozone at 40 and 70 ppb adversely affected rice physiology, photosynthesis, and biomass.
- Taxon
- rice
Oryza sativae0 - Treatment
- ozone at the concentration of both 40 and 70 ppbe0
- Outcome
- rice physiology, photosynthesis and biomasse0
- Direction
- negative effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ozone at the concentration of both 40 and 70 ppb caused negative effects on rice physiology, photosynthesis and biomass”
Claim · model-written summary
Ozone at 70 ppb caused particularly severe damage.
- Taxon
- riceOryza sativat0
- Treatment
- 70 ppb concentratione0
- Outcome
- sever damagee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The 70 ppb concentration, particularly, caused sever damage”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Chitosan reduced harmful ozone effects relative to the control group.
- Taxon
- riceOryza sativat0
- Treatment
- soaking and spraying with chitosane0
- Outcome
- harmful effects of ozonee0
- Direction
- reducee0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soaking and spraying with chitosan could significantly reduce the harmful effects of ozone compared with the control group”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Chitosan-treated rice under 40 ppb ozone had greater photosynthesis than untreated rice at the same ozone level after 21 days.
- Taxon
- riceOryza sativat0
- Treatment
- Chi+EO 3 40e0
- Outcome
- photosynthesise0
- Direction
- moree0
- Qualifier
- for 21 dayse0
- Comparator
- EO 3 40e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the samples soaked and sprayed with chitosan under elevated ozone for 21 days, Chi+EO 3 40 and Chi+EO 3 70 significantly performed more photosynthesis and contained more leaf chlorophyll than EO 3 40 and EO 3 70, respectively (p 0.05)”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Chitosan-treated rice under 70 ppb ozone had greater photosynthesis than untreated rice at the same ozone level after 21 days.
- Taxon
- riceOryza sativat0
- Treatment
- Chi+EO 3 70e0
- Outcome
- photosynthesise0
- Direction
- moree0
- Qualifier
- for 21 dayse0
- Comparator
- EO 3 70e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the samples soaked and sprayed with chitosan under elevated ozone for 21 days, Chi+EO 3 40 and Chi+EO 3 70 significantly performed more photosynthesis and contained more leaf chlorophyll than EO 3 40 and EO 3 70, respectively (p 0.05)”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Chitosan-treated rice under 40 ppb ozone had more leaf chlorophyll than untreated rice at the same level.
- Taxon
- riceOryza sativat0
- Treatment
- Chi+EO 3 40e0
- Outcome
- leaf chlorophylle0
- Direction
- moree0
- Comparator
- EO 3 40e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chi+EO 3 40 and Chi+EO 3 70 significantly performed more photosynthesis and contained more leaf chlorophyll than EO 3 40 and EO 3 70, respectively”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Chitosan-treated rice under 70 ppb ozone had more leaf chlorophyll than untreated rice at the same level.
- Taxon
- riceOryza sativat0
- Treatment
- Chi+EO 3 70e0
- Outcome
- leaf chlorophylle0
- Direction
- moree0
- Comparator
- EO 3 70e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chi+EO 3 40 and Chi+EO 3 70 significantly performed more photosynthesis and contained more leaf chlorophyll than EO 3 40 and EO 3 70, respectively”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Biomass did not differ significantly from the control group.
- Taxon
- riceOryza sativat0
- Outcome
- biomasse0
- Direction
- no significant differencee0
- Comparator
- control groupe0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no significant difference in biomass compared with the control group”
t0“rice (Oryza sativa L.)”
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
- positive
25 papers more in this group
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.