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Planta : Volume 212, Issue 2, January 2001

Planta : Volume 212, Issue 1, December 2000

Xanthophyll synthesis in diatoms: quantification of putative intermediates and comparison of pigment conversion kinetics with rate constants derived from a model

Content Provider	Springer Nature Link
Author	Lohr, Martin Wilhelm, Christian
Copyright Year	2001
Abstract	Recently, we reported the presence of the violaxanthin-antheraxanthin-zeaxanthin cycle in diatoms, and showed that violaxanthin is the putative precursor of both diadinoxanthin and fucoxanthin in the diatom Phaeodactylum tricornutum Bohlin (M. Lohr and C. Wilhelm, 1999, Proc. Natl. Acad. Sci. USA 96: 8784–8789). In the present study, two possible intermediates in the synthesis of violaxanthin from β-carotene were identified in P. tricornutum, namely β-cryptoxanthin and β-cryptoxanthin epoxide. In low light, the latter pigment prevails, but in high light β-cryptoxanthin accumulates, probably as the result of an increased activity of the xantophyll-cycle de-epoxidase. The apparent kinetics of several xanthophyll conversion steps were determined for P. tricornutum and Cyclotella meneghiniana Kützing. The experimentally determined conversion rates were used to evaluate the hypothetical pathway of xanthophyll synthesis in diatoms. For this purpose a mathematical model was developed which allows the calculation of theoretical rates of pigment conversion for microalgae under steady-state growth conditions. A comparison between measured and calculated conversion rates agreed well with the proposal of a sequential synthesis of fucoxanthin via violaxanthin and diadinoxanthin. The postulation of zeaxanthin as an obligatory intermediate in the synthesis of violaxanthin, however, resulted in large discrepancies between the measured and calculated rates of its epoxidation. Instead of zeaxanthin, β-cryptoxanthin epoxide may be involved in the biosynthesis of violaxanthin in diatoms.
Starting Page	382
Ending Page	391
Page Count	10
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	212
Issue Number	3
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-02-19
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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