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Ultrastructural study of plasmodesmata in the brown alga Dictyota dichotoma (Dictyotales, Phaeophyceae)

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Title: Ultrastructural study of plasmodesmata in the brown alga Dictyota dichotoma (Dictyotales, Phaeophyceae)
Authors: Terauchi, Makoto Browse this author
Nagasato, Chikako Browse this author →KAKEN DB
Kajimura, Naoko Browse this author
Mineyuki, Yoshinobu Browse this author
Okuda, Kazuo Browse this author
Katsaros, Christos Browse this author
Motomura, Taizo Browse this author →KAKEN DB
Keywords: Brown algae
Cell wall
Dictyota dichotoma
Electron tomography
Pit field
Issue Date: Oct-2012
Publisher: Springer-Verlag
Journal Title: Planta
Volume: 236
Issue: 4
Start Page: 1013
End Page: 1026
Publisher DOI: 10.1007/s00425-012-1656-4
PMID: 22547029
Abstract: Plasmodesmata (PD) singular: plasmodesma, from the Greek plasma=cytoplasm and desmos=connection) are intercellular bridges of multicellular plants, directly connecting cytoplasms of neighboring cells. They play a crucial role in cell-to-cell communication and cell development. Although brown algae (Phaeophyceae, Heterokontophyta) are phylogenetically far from the lineage of land plants, they possess a complex multicellularity with PD like green plants. In this study, the ultrastructure and the formation of PD in the brown alga Dictyota dichotoma, were studied using transmission electron microscopy (TEM) and electron tomography with rapid freezing and freeze-substitution. D. dichotoma, possesses plasma membrane-lined simple PD without an internal endoplasmic reticulum (ER) (desmotubule), different from those of land plants. PD were clustered in thin cell wall regions forming pit fields. Fine proteinaceous internal bridges were observed in the cavity. Ultrastructural observations of cytokinesis of D. dichotoma revealed that the PD formation started from an early stage of cytokinesis with the formation of tubular pre-plasmodesmata (PPD) within the membranous sacs (MSs) of the cytokinetic diaphragm. Clustering of these PPD became into the future pit field. As cytokinesis proceeds, electron-dense material extended from the outer surface of the middle part of PPD and finally formed the nascent cell wall. From these results, it is suggested that PPD would be associated with the cell wall development during cytokinesis of D. dichotroma.
Rights: The original publication is available at
Type: article (author version)
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 本村 泰三

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