NDLI: Interactions between irradiance and nutrient availability during astaxanthin accumulation and degradation in Haematococcus pluvialis

Content Provider	Springer Nature Link
Author	Fábregas, J. Domínguez, A. Maseda, A. Otero, A.
Copyright Year	2003
Abstract	Fully synchronised germination of Haematococcus pluvialis astaxanthin-replete aplanospores was induced by transfer to nitrogen-sufficient conditions under either high or low light intensities, and growth, pigment content and nitrogen consumption were monitored during the cell cycle. No germination of the aplanospores was achieved in the absence of nitrate, even when cells were transferred at low light intensities. On the other hand, cell density and chlorophyll concentration increased dramatically and astaxanthin concentration decreased in N-sufficient cultures due to the germination of 100% of the aplanospores, as demonstrated by flow cytometry. No significant effect of light intensity was observed on the degradation of astaxanthin during germination. In germinated cultures, nitrogen was depleted more rapidly under high light conditions, which resulted in earlier entry into the aplanospore stage and accumulation of astaxanthin. Germination of aplanospores accompanied by astaxanthin degradation could also be obtained in the dark in nutrient-sufficient conditions although at a much lower efficiency. The results demonstrate that nutrient availability is the main factor controlling the transition between red and green stages of H. pluvialis, with astaxanthin being accumulated only when cell division has ceased. High light levels accelerate the process by increasing the rate of nutrient depletion and providing more energy for astaxanthin synthesis.
Starting Page	545
Ending Page	551
Page Count	7
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	61
Issue Number	5-6
e-ISSN	14320614
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-01-14
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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