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Journal Article
Research Support, Non-U.S. Gov't
Qualitative and quantitative composition of pigments in Phaeodactylum tricornutum (Bacillariophyceae) stressed by iron.
Biometals : An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine 2004 Februrary
The effect of Fe(III) deficiency on qualitative and quantitative changes in pigment composition in Phaeodactylum tricornutum Bohlin was demonstrated by HPLC and AAS. Maximum content of pigments showed the diatom cells incubated at the optimum iron concentration, i.e., 10 microM. The contents of chlorophyll a, chlorophyll c1 + c2, fucoxanthin, diadinoxanthin and beta,beta-carotene were 109.99, 20.16, 40.39, 1.29 and 1.48 fg per cell, respectively. The results obtained showed that Fe(III) affected qualitative and quantitative pigment composition in P. tricornutum. The content of individual pigments, proportions between accompanying pigments and their ratios to chlorophyll a were important indicators of phytoplankton response to iron stress. The strong reduction in beta,beta-carotene content, several times (2-5) increase in diadinoxanthin level as compared to beta,beta-carotene, and high amount of diadinoxanthin in relation to chlorophyll a were observed in algae growing at very low Fe(III) concentrations, 0.001 and 0.01 microM. The data suggested that phytoplankton pigments could be a potential physiological marker.
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