Abstract
Melatonin
is present in numerous phototrophic eukaryotes, not only in plants in the
meaning of Archaeplastida or of Viridiplantae. It is also formed in members of
other superclades, such as Excavata and SAR clade. Typically, their respective
phototrophs have acquired chloroplasts from phototrophic eukaryotes, either by
taking them up as endosymbionts or by chloroplast capturing. It has been the
aim of this overview to trace the phylogenetic relationships between the
various phototrophs according to actual, genetically based taxonomy. This
includes the consideration of primary heterotrophs that also exist within the
same groups and some secondary heterotrophs that have lost functional
chloroplasts. The presence of melatonin in these different taxa is discussed
under the aspects of its cyanobacterial or α-proteobacterial origins, as
transmitted by plastidial or mitochondrial ancestors, or by horizontal gene
transfer. Peculiarities of melatonin metabolism that have evolved in some of
these groups are also addressed.
Cited by
29 articles.
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