Abstract
The relationship between CO2 concentration in the rhizosphere and the growth of cucumber plant was studied. Growth rates of cucumber plant growing in the sand culture were compared for CO2 concentration varying from 0 to 5% in the rhizosphere. The effects of CO2 and O2 in the rhizosphere on photosynthetic rate were then investigated.The results obtained were as follows.(1) The growth suppression of cucumber plant occurred at 0.5-2% CO2 in the rhizosphere. Total dry weight and leaf area decreased up to 80-90% by the increase of CO2 concentration (2-5%) in the rhizosphere.(2) The growth suppression by CO2 was found five days after the beginning of treatments.(3) Water content of the top decreased with increase in CO2 concentration in the rhizosphere.(4) Photosynthetic rate decreased two hours after the beginning of treatments even at 3-5% CO2. After four hours, photosynthetic rate at 10% CO2 declined up to 85% of that before the treatment, while it retained 95% when treated with 10% O2.As described above, it is proved that the growth of cucumber plant is suppressed with increase in CO2 concentration in the rhizosphere before the suppression by decreasing O2 concentration occurs.
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Claims 8
Claim · model-written summary
Cucumber growth was suppressed at 0.5-2% rhizosphere CO2.
- Taxon
- cucumber plant
Cucumis sativuse0 - Treatment
- 0.5-2% CO2e0
- Outcome
- growth suppressione0
- Direction
- suppressione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth suppression of cucumber plant occurred at 0.5-2% CO2 in the rhizosphere.”
Claim · model-written summary
Total dry weight decreased by up to 80-90% as rhizosphere CO2 increased to 2-5%.
- Taxon
- cucumber plantCucumis sativuse1
- Treatment
- CO2 concentration (2-5%)e0
- Outcome
- Total dry weighte0
- Direction
- decreasede0
- Value
- 80-90%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total dry weight and leaf area decreased up to 80-90% by the increase of CO2 concentration (2-5%) in the rhizosphere.”
e1“the growth of cucumber plant was studied”
Claim · model-written summary
Leaf area decreased by up to 80-90% as rhizosphere CO2 increased to 2-5%.
- Taxon
- cucumber plantCucumis sativuse1
- Treatment
- CO2 concentration (2-5%)e0
- Outcome
- leaf areae0
- Direction
- decreasede0
- Value
- 80-90%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total dry weight and leaf area decreased up to 80-90% by the increase of CO2 concentration (2-5%) in the rhizosphere.”
e1“the growth of cucumber plant was studied”
Claim · model-written summary
CO2 growth suppression appeared five days after treatment began.
- Taxon
- cucumber plantCucumis sativuse1
- Outcome
- growth suppression by CO2e0
- Value
- five dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth suppression by CO2 was found five days after the beginning of treatments.”
e1“the growth of cucumber plant was studied”
Claim · model-written summary
Top water content decreased as rhizosphere CO2 concentration increased.
- Taxon
- cucumber plantCucumis sativuse1
- Treatment
- CO2 concentratione0
- Outcome
- Water content of the tope0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water content of the top decreased with increase in CO2 concentration in the rhizosphere.”
e1“the growth of cucumber plant was studied”
Claim · model-written summary
Photosynthetic rate decreased two hours after 3-5% CO2 treatment began.
- Taxon
- cucumber plantCucumis sativuse1
- Treatment
- 3-5% CO2e0
- Outcome
- Photosynthetic ratee0
- Direction
- decreasede0
- Qualifier
- two hourse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic rate decreased two hours after the beginning of treatments even at 3-5% CO2.”
e1“the growth of cucumber plant was studied”
Claim · model-written summary
At four hours, photosynthesis under 10% CO2 declined to 85% of pretreatment rate.
- Taxon
- cucumber plantCucumis sativuse1
- Treatment
- 10% CO2e0
- Outcome
- photosynthetic ratee0
- Direction
- declinede0
- Value
- 85%e0
- Comparator
- before the treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After four hours, photosynthetic rate at 10% CO2 declined up to 85% of that before the treatment”
e1“the growth of cucumber plant was studied”
Claim · model-written summary
Increasing rhizosphere CO2 suppressed cucumber growth before declining O2 did.
- Taxon
- cucumber plantCucumis sativuse0
- Outcome
- growth of cucumber plante0
- Direction
- suppressede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the growth of cucumber plant is suppressed with increase in CO2 concentration in the rhizosphere before the suppression by decreasing O2 concentration occurs”
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See all 22 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.