Historically, floridean starch has been described as lacking amylose.
2.
However, amylose has been identified as a component of floridean starch granules in some cases, particularly in unicellular red algae.
3.
Rhodoplasts synthesize a form of starch called floridean starch, which collects into granules outside the rhodoplast, in the cytoplasm of the red alga.
4.
Other organisms whose evolutionary history suggests secondary endosymbiosis of a red alga also use storage polymers similar to floridean starch, for example, dinoflagellates and cryptophytes.
5.
Red algae store sugars as floridean starch, which is a type of starch that consists of highly branched amylopectin without amylose, as food reserves outside their plastids.
6.
The presence of floridean starch-like storage in some apicomplexan parasites is one piece of evidence supporting a red alga ancestry for the apicoplast, a non-photosynthetic organelle.
7.
In a few cases, red algae have been found to use cytosolic glycogen rather than floridean starch as a storage polymer; examples such as " Galdieria sulphuraria " are found in the Cyanidiales, which are unicellular extremophiles.
8.
Although most red algae use floridean starch as a storage glucan, " G . sulphuraria " uses a highly unusual form of glycogen which is among the most highly branched glycogens known, has very short branch lengths, and forms particles of unusually low molecular weight.
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