Claim · model-written summary
The alga, not the fern tissue, is the agent of acetylene reduction.
AzollaNot reportedMaterialGeneCompoundOrgan / stageSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValueQualifier
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“This study shows that the alga is the agent of acetylene reduction and suggests that there is considerable transport of metabolites between the fern and the blue-green alga”
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 Prolonged growth (6-7 months) on nitrate or urea decreased the rate of acetylene reduction by 90%.
- 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 Considerable transport of metabolites between Azolla and its blue-green alga is suggested.