Growth-rate adaptation of Phycomyces sporangiophores to partial depletion of oxygen

The growth rate of Phycomyces blakesleeanus sporangiophores was found to be very sensitive to sudden changes in the oxygen concentration. A change from 20% to 15% oxygen elicits a transient decrease in the growth rate which returns to normal 10 min after altering the concentration. After a step chan...

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Bibliographic Details
Published in:Planta 1984-05, Vol.161 (2), p.137-141
Main Authors: Galland, Paul, Russo, Vincenzo E.A.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Gene expression regulation
Hypoxia
Nitrogen
Oxygen
Phototropism
Phycomyces
Phycomyces blakesleeanus
Physical agents
Physiological stimulation
Plant growth
Plant physiology and development
Plants
Respiration
Vegetative apparatus, growth and morphogenesis. Senescence
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Summary:The growth rate of Phycomyces blakesleeanus sporangiophores was found to be very sensitive to sudden changes in the oxygen concentration. A change from 20% to 15% oxygen elicits a transient decrease in the growth rate which returns to normal 10 min after altering the concentration. After a step change to 10% oxygen, the growth rate shows two minima at 6—8 and 30—35 min and it reaches about 80% of its original value 50 min after this change. A threshold curve for this negative growth response shows that sporangiophores begin to sense a decrease in the oxygen concentration from 20% to 17%. Seven photo-tropically abnormal mutants with defects in the genes madA to madG were tested for the oxygen response. Two strains, C149madD120 and C316madF48, were found to have recoveries different from those of the wild type after step changes from 20% to 10% oxygen.
ISSN:0032-0935
1432-2048
DOI:10.1007/BF00395473