Plastid division in mallomonas (Synurophyceae, Heterokonta)

Weatherill, Kimalee, Lambiris, Irene, Pickett-Heaps, Jeremy, Deane, James and Beech, Peter 2007, Plastid division in mallomonas (Synurophyceae, Heterokonta), Journal of Phycology, vol. 43, no. 3, pp. 535-541, doi: 10.1111/j.1529-8817.2007.00356.x.

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Title Plastid division in mallomonas (Synurophyceae, Heterokonta)
Author(s) Weatherill, Kimalee
Lambiris, Irene
Pickett-Heaps, Jeremy
Deane, James
Beech, PeterORCID iD for Beech, Peter
Journal name Journal of Phycology
Volume number 43
Issue number 3
Start page 535
End page 541
Publisher John Wiley and Sons Ltd.
Place of publication Maiden, Mass.
Publication date 2007-05-16
ISSN 0022-3646
Keyword(s) chloroplast
plastid-dividing ring
secondary endosymbiosis
Summary Laser scanning confocal microscopy and TEM were used to study the morphology of secondary plastids in algae of the genus Mallomonas (Synurophyceae). At interphase, Mallomonas splendens (G. S. West) Playfair, M. rasilis Dürrschm., M. striata Asmund, and M. adamas K. Harris et W. H. Bradley contained a single H-shaped plastid consisting of two large lobes connected by a narrow isthmus. Labeling of DNA revealed a necklace-like arrangement of plastid nucleoids at the periphery of the M. splendens plastid and a less-patterned array in M. rasilis. The TEM of M. splendens and M. rasilis showed an electron-dense belt surrounding the plastid isthmus in interphase cells; this putative plastid-dividing ring (PD ring) was adpressed to the inner pair of the four plastid membranes, suggesting that it is homologous to the PD ring of green and red plastids. The PD ring did not contain actin (indicated by lack of staining with phalloidin) and displayed filaments or tubules of 5–10 nm in diameter that may be homologous to the tubules described in red algal PD rings. Confocal microscopy of chl autofluorescence from M. splendens showed that the plastid isthmus was severed as mitosis began, giving rise to two single-lobed daughter plastids, which, as mitosis and cell division progressed, separated from one another and then each constricted to form the H-shaped plastids of daughter cells. Similar plastid division cycles were observed in M. rasilis and M. adamas; however, the plastid isthmus of M. striata was retained throughout most of cell division and was eventually severed by the cell cleavage furrow.
Language eng
DOI 10.1111/j.1529-8817.2007.00356.x
Field of Research 060701 Phycology (incl Marine Grasses)
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2007, Phycological Society of America
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