In:
Zeitschrift für Naturforschung C, Walter de Gruyter GmbH, Vol. 53, No. 1-2 ( 1998-2-1), p. 93-100
Abstract:
The photoprotective function of the ketocarotenoid astaxanthin in Haematococcus was questioned. When exposed to high irradiance and/or nutritional stress, green Haematococcus cells turned red due to accumulation of an immense quantity of the red pigment astaxanthin. Our results demonstrate that: 1) The addition of diphenylamine, an inhibitor of astaxanthin biosynthesis, causes cell death under high light intensity; 2) Red cells are susceptible to high light stress to the same extent or even higher then green ones upon exposure to a very high light intensity (4000 μmol photon m -2 s -1 ); 3) Addition of 1 O 2 generators (methylene blue, rose bengal) under noninductive conditions (low light of 100 (μmol photon m -2 s -1 ) induced astaxanthin accumulation. This can be reversed by an exogenous 1 O 2 quencher (histidine); 4) Histidine can prevent the accumulation of astaxanthin induced by phosphate starvation. We suggest that: 1) Astaxanthin is the result of the photoprotection process rather than the protective agent; 2) 1 O 2 is involved indirectly in astaxanthin accumulation process.
Type of Medium:
Online Resource
ISSN:
1865-7125
,
0939-5075
DOI:
10.1515/znc-1998-1-217
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
1998
detail.hit.zdb_id:
2078107-6
SSG:
12
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