Marine & Environmental Sciences Faculty Articles

Title

Differences in Pigmentation Between Life Cycle Stages in Scrippsiella lachrymosa (dinophyceae)

Document Type

Article

Publication Date

2-2016

Publication Title

Journal of Phycology

Keywords

Accumulation body, Dinoflagellate, Gamete, Life stage, Pellicle cyst, Pigment, Resting cyst, Scrippsiella lachrymosa, Zygote

ISSN

0022-3646

Volume

52

Issue/No.

1

First Page

64

Last Page

74

Abstract

Various life cycle stages of cyst‐producing dinoflagellates often appear differently colored under the microscope; gametes appear paler while zygotes are darker in comparison to vegetative cells. To compare physiological and photochemical competency, the pigment composition of discrete life cycle stages was determined for the common resting cyst‐producing dinoflagellate Scrippsiella lachrymosa. Vegetative cells had the highest cellular pigment content (25.2 ± 0.5 pg · cell−1), whereas gamete pigment content was 22% lower. The pigment content of zygotes was 82% lower than vegetative cells, even though they appeared darker under the microscope. Zygotes of S. lachrymosa contained significantly higher cellular concentrations of β‐carotene (0.65 ± 0.15 pg · cell−1) than all other life stages. Photoprotective pigments and the de‐epoxidation ratio of xanthophylls‐cycle pigments in S. lachrymosa were significantly elevated in zygotes and cysts compared to other stages. This suggests a role for accessory pigments in combating intracellular oxidative stress during sexual reproduction or encystment. Resting cysts contained some pigments even though chloroplasts were not visible, suggesting that the brightly colored accumulation body contained photosynthetic pigments. The differences in pigmentation between life stages have implications for interpretation of pigment data from field samples when sampled during dinoflagellate blooms.

Comments

©2015 Phycological Society of America

ORCID ID

0000-0003-3556-7616

DOI

10.1111/jpy.12364

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Peer Reviewed

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