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Plant and Cell Physiology, 1995, Vol. 36, No. 8 1519-1524
© 1995

The Biosynthetic Pathway of Astaxanthin in a Green Alga Haematococcus pluvialis as Indicated by Inhibition with Diphenylamine

Lu Fan1, Avigad Vonshak1, Rachel Gabbay2, Joseph Hirshberg2, Zvi Cohen1 and Sammy Boussiba1,3

1 Microalgal Biotechnology, The Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev Sede-Boker Campus, 84990 Israel
2 Department of Genetics, The Hebrew University of Jerusalem Jerusalem, 91904, Israel

3Corresponding author.

The effect of diphenylamine on astaxanthin biosynthesis in Haematococcus pluvialis was studied. Cultures induced to produce astaxanthin accumulated rß-carotene in the presence of the inhibitor. It was found that 30 µM diphenylamine specifically inhibits the biosynthesis of astaxanthin at the step of conversion of rß-carotene to echinenone and canthaxanthin. The results imply that these two compounds are genuine intermediates in the pathway of astaxanthin biosynthesis in H. pluvialis.

(Received June 26, 1995; Accepted September 7, 1995)
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