Abstract
Upon carbon starvation the β-carotene content of Phycomyces mycelium grown on minimal agar medium disappears with a time lag of about 90 min and a T1/2 of 68–75 min. If continuous light is given 2 h after starvation, there is an increase in β-carotene content with respect to the dark control. This increase has a time lag of 20–25 min. The fluence rate-response curve of wt is biphasic and two mutants in the gene madA (madA7, madA35) and in the gene madB (madB101, madB104) have higher thresholds than wt; madB mutants are blinder than madA mutants. Only blue light is effective and we suggest that it has an effect solely on the catabolism of β-carotene.
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Abbreviations
- D:
-
dark
- L:
-
light
- wt :
-
wild type
References
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Raugei, G., Dohrmann, U., Pohl, U. et al. Kinetics of photoaccumulation of β-carotene in Phycomyces blakesleeanus . Planta 155, 296–300 (1982). https://doi.org/10.1007/BF00429454
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DOI: https://doi.org/10.1007/BF00429454