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The ultrastructural features and division of secondary plastids

  • Current Topics in Plant Research
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Abstract

Plastids in heterokonts, cryptophytes, haptophytes, dinoflagellates, chlorarachniophytes, euglenoids, and apicomplexan parasites derive from secondary symbiogenesis. These plastids are surrounded by one or two additional membranes covering the plastid-envelope double membranes. Consequently, nuclear-encoded plastid division proteins have to be targeted into the division site through the additional surrounding membranes. Electron microscopic observations suggest that the additional surrounding membranes are severed by mechanisms distinct from those for the division of the plastid envelope. In heterokonts, cryptophytes and haptophytes, the outermost surrounding membrane (epiplastid rough endoplasmic reticulum, EPrER) is studded with cytoplasmic ribosomes and connected to the rER and the outer nuclear envelope. In monoplastidic species belonging to these three groups, the EPrER and the outer nuclear envelope are directly connected to form a sac enclosing the plastid and the nucleus. This nuclear-plastid connection, referred to as the nucleus-plastid consortium (NPC), may be significant to ensure the transmission of the plastids during cell division. The plastid dividing-ring (PD-ring) is a conserved component of the division machinery for both primary and secondary plastids. Also, homologues of the bacterial cell division protein, FtsZ, may be involved in the division of secondary plastids as well as primary plastids, though in secondary plastids they have not yet been localized to the division site. It remains to be examined whether or not dynamin-like proteins and other protein components known to function in the division of primary plastids are used also in secondary plastids. The nearly completed sequencing of the nuclear genome of the diatom Thalassiosira pseudonana will give impetus to molecular and cell biological studies on the division of secondary plastids.

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    Haruki Hashimoto

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Hashimoto, H. The ultrastructural features and division of secondary plastids. J Plant Res 118, 163–172 (2005). https://doi.org/10.1007/s10265-005-0214-6

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