Claim · model-written summary
Prolonged growth (6-7 months) on nitrate or urea decreased the rate of acetylene reduction by 90%.
- Treatment
- Prolonged growth on nitrate or ureae4
- Outcome
- rate of acetylene reductione4
- Direction
- decreasee4
- Value
- 90%e4
- Qualifier
- 6-7 monthse4
AzollaNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The growth of Azolla for 35 days with nitrate or urea as a nitrogen source decreased the rate of acetylene reduction approximately 30% compared to controls grown on nitrogen”
e4“Prolonged growth on nitrate or urea (6-7 months) resulted in a 90% decrease in the rate of acetylene reduction”
Title
The Azolla, Anabaena azollae Relationship
Gerald A. Peters; Berger C. Mayne PLANT PHYSIOLOGY 1974. doi:10.1104/pp.53.6.820
Other claims from this paper (11)
- Observation Acetylene reduction by Azolla caroliniana is light-dependent and saturated at approximately 450 foot candles.
- Observation The maximum acetylene reduction rate of Azolla was 60 nmoles/mg chlorophyll per minute.
- Observation Acetylene reduction rates of 25 to 30 nmoles/mg chlorophyll per minute were more common.
- Intervention effect Growing Azolla for 35 days on nitrate or urea decreased acetylene reduction by approximately 30% compared with nitrogen-grown controls.
- Intervention effect Inhibition of acetylene reduction by 3 (3,4-dichlorophenol) 1,1-dimethylurea was not pronounced until the Azolla reserves were depleted.
- Intervention effect The herbicide 3 (3,4-dichlorophenol) 1,1-dimethylurea inhibited oxygen evolution by 75% within 10 minutes.
- Intervention effect Adding 20% oxygen (v/v) decreased acetylene reduction by 30 to 40%.
- Observation Aerobic dark acetylene reduction was 10 to 30% of the aerobic rate in the light.
- Intervention effect Acetylene reduction activity of Azolla was absent in fronds freed of the symbiotic alga and present in isolated Anabaena azollae.
- Mechanism The alga, not the fern tissue, is the agent of acetylene reduction.
- Mechanism Considerable transport of metabolites between Azolla and its blue-green alga is suggested.