Abstract
Abstract Intact tobacco roots growing in nutrient solution spray in a sealed chamber were treated with mixtures of O 2 , N 2 , and CO 2 gases. Oxygen and water uptake by roots and plant stem diameter were recorded. Anaerobic treatments produced by flushing roots with N 2 or N 2 plus 21% CO 2 gases for 6 hours decreased water uptake 50% or more, but restoration of air to roots caused a rapid recovery of water uptake. Root injury was caused by both treatments, as evidenced by reduced oxygen uptake following each treatment. Gases with 1% or more oxygen had little or no effect on water uptake. Treatment gases containing up to 21% CO 2 had the same effect on water uptake as treatment gases without CO 2 . Oxygen deficiency appears to be the primary cause of the initial decrease in water uptake and wilting of tobacco subjected to poor root aeration.
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Claims 6
Claim · model-written summary
Anaerobic treatments with N2 or N2 plus 21% CO2 for 6 hours decreased tobacco root water uptake by 50% or more.
- Taxon
- tobacco
Nicotiana tabacume0 - Organ / stage
- rootse0
- Treatment
- N 2 or N 2 plus 21% CO 2 gases for 6 hourse1
- Outcome
- water uptakee1
- Direction
- decreasede1
- Value
- 50% or moree1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intact tobacco roots growing in nutrient solution spray in a sealed chamber were treated with mixtures of O 2 , N 2 , and CO 2 gases”
e1“Anaerobic treatments produced by flushing roots with N 2 or N 2 plus 21% CO 2 gases for 6 hours decreased water uptake 50% or more”
Claim · model-written summary
Restoring air to tobacco roots caused a rapid recovery of water uptake.
- Taxon
- tobaccoNicotiana tabacume0
- Organ / stage
- rootse0
- Treatment
- restoration of air to rootse2
- Outcome
- water uptakee2
- Direction
- rapid recoverye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intact tobacco roots growing in nutrient solution spray in a sealed chamber were treated with mixtures of O 2 , N 2 , and CO 2 gases”
e2“but restoration of air to roots caused a rapid recovery of water uptake”
Claim · model-written summary
Both anaerobic treatments caused root injury in tobacco, evidenced by reduced oxygen uptake.
- Taxon
- tobaccoNicotiana tabacume0
- Organ / stage
- rootse0
- Treatment
- both treatmentse3
- Outcome
- oxygen uptakee3
- Direction
- reducede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intact tobacco roots growing in nutrient solution spray in a sealed chamber were treated with mixtures of O 2 , N 2 , and CO 2 gases”
e3“Root injury was caused by both treatments, as evidenced by reduced oxygen uptake following each treatment”
Claim · model-written summary
Gases with 1% or more oxygen had little or no effect on tobacco root water uptake.
- Taxon
- tobaccoNicotiana tabacume0
- Organ / stage
- rootse0
- Treatment
- Gases with 1% or more oxygene4
- Outcome
- water uptakee4
- Direction
- little or no effecte4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intact tobacco roots growing in nutrient solution spray in a sealed chamber were treated with mixtures of O 2 , N 2 , and CO 2 gases”
e4“Gases with 1% or more oxygen had little or no effect on water uptake”
Claim · model-written summary
Treatment gases with up to 21% CO2 had the same effect on tobacco root water uptake as gases without CO2.
- Taxon
- tobaccoNicotiana tabacume0
- Organ / stage
- rootse0
- Treatment
- Treatment gases containing up to 21% CO 2e5
- Outcome
- water uptakee5
- Direction
- same effecte5
- Comparator
- treatment gases without CO 2e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intact tobacco roots growing in nutrient solution spray in a sealed chamber were treated with mixtures of O 2 , N 2 , and CO 2 gases”
e5“Treatment gases containing up to 21% CO 2 had the same effect on water uptake as treatment gases without CO 2”
Claim · model-written summary
Oxygen deficiency is the likely primary cause of the initial decrease in tobacco water uptake and wilting under poor root aeration.
- Taxon
- tobaccoNicotiana tabacume6
- Treatment
- poor root aeratione6
- Outcome
- initial decrease in water uptakee6
- Qualifier
- Oxygen deficiency appears to be the primary causee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Oxygen deficiency appears to be the primary cause of the initial decrease in water uptake and wilting of tobacco subjected to poor root aeration”
The same questions in other papers
co2 · physiology: water · Nicotiana tabacum (tobacco)Positive and negative results
2 in the opposite direction
- positive
- positive
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.