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A HYPOTHESIS FOR PLASTID EVOLUTION IN CHROMALVEOLATES1
Article first published online: 3 SEP 2008
© 2008 Phycological Society of America
Journal of Phycology
Volume 44, Issue 5, pages 1097–1107, October 2008
How to Cite
Sanchez-Puerta, M. V. and Delwiche, C. F. (2008), A HYPOTHESIS FOR PLASTID EVOLUTION IN CHROMALVEOLATES. Journal of Phycology, 44: 1097–1107. doi: 10.1111/j.1529-8817.2008.00559.x
Received 24 September 2007. Accepted 14 March 2008.
- Issue published online: 8 OCT 2008
- Article first published online: 3 SEP 2008
Four eukaryotic lineages, namely, haptophytes, alveolates, cryptophytes, and heterokonts, contain in most cases photosynthetic and nonphotosynthetic members—the photosynthetic ones with secondary plastids with chl c as the main photosynthetic pigment. These four photosynthetic lineages were grouped together on the basis of their pigmentation and called chromalveolates, which is usually understood to imply loss of plastids in the nonphotosynthetic members. Despite the ecological and economic importance of this group of organisms, the phylogenetic relationships among these algae are only partially understood, and the so-called chromalveolate hypothesis is very controversial. This review evaluates the evidence for and against this grouping and summarizes the present understanding of chromalveolate evolution. We also describe a testable hypothesis that is intended to accommodate current knowledge based on plastid and nuclear genomic data, discuss the implications of this model, and comment on areas that require further examination.