Actin based processes that could determine the cytoplasmic architecture of plant cells

Honing, Hannie S. van der; Emons, A.M.C.; Ketelaar, Tijs

doi:10.1016/j.bbamcr.2006.07.009

Cited by 23 publications

(14 citation statements)

References 134 publications

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“…However, the Wnal form of the vacuole in mature cells is very diVerent from the usual large central vacuole which develops in most plant cells. There is evidence from some studies on plant cells that the cytoplasmic area in the cortical and perinuclear regions are connected by cytoplasmic strands which traverse the vacuole, as shown in studies with cultures of tobacco BY-2 cells (Di Sansebastiano et al 2001;Honing et al 2007). This connection is very important for transport of proteins, organelles, nutrients, and also to facilitate the very dynamic changes which occur in the shape and location of organelles.…”

Section: Discussionmentioning

confidence: 95%

“…There is evidence from other studies for support of cytoplasmic strands by actin Wlaments. Nebenführ et al (1999) has shown that myosin is also involved in the reorganization of cytoplasmic strands (Krzeszowiec et al 2007;Prager-Khoutorsky et al 2007;Honing et al 2007). When actin Wlaments were depolymerized by drug treatment, the cytoplasmic stands also disappeared (Honing et al 2007).…”

Section: Discussionmentioning

confidence: 97%

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Structural changes in the vacuole and cytoskeleton are key to development of the two cytoplasmic domains supporting single-cell C4 photosynthesis in Bienertia sinuspersici

Park

Knoblauch

Okita

et al. 2008

Planta

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Bienertia sinuspersici Akhani has an unusual mechanism of C4 photosynthesis which occurs within individual chlorenchyma cells. To perform C4, the mature cells have two cytoplasmic compartments consisting of a central (CCC) and a peripheral (PCC) domain containing dimorphic chloroplasts which are interconnected by cytoplasmic channels. Based on leaf development studies, young chlorenchyma cells have not developed the two cytoplasmic compartments and dimorphic chloroplasts. Fluorescent dyes which are targeted to membranes or to specific organelles were used to follow changes in cell structure and organelle distribution during formation of C4-type chlorenchyma. Chlorenchyma cell development was divided into four stages: 1-the nucleus and chloroplasts occupy much of the cytoplasmic space and only small vacuoles are formed; 2-development of larger vacuoles, formation of a pre-CCC with some scattered chloroplasts; 3-the vacuole expands, cells have directional growth; 4-mature stage, cells have become elongated, with a distinctive CCC and PCC joined by interconnecting cytoplasmic channels. By staining vacuoles with a fluorescent dye and constructing 3D images of chloroplasts, and by microinjecting a fluorescence dye into the vacuole of living cells, it was demonstrated that the mature cell has only one vacuole, which is traversed by cytoplasmic channels connecting the CCC with the PCC. Immunofluorescent studies on isolated chlorenchyma cells treated with cytoskeleton disrupting drugs suspended in different levels of osmoticum showed that both microtubules and actin filaments are important in maintaining the cytoplasmic domains. With prolonged exposure of plants to dim light, the cytoskeleton undergoes changes and there is a dramatic shift of the CCC from the center toward the distal end of the cell.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 97%

Structural changes in the vacuole and cytoskeleton are key to development of the two cytoplasmic domains supporting single-cell C4 photosynthesis in Bienertia sinuspersici

Park

Knoblauch

Okita

et al. 2008

Planta

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“…ADF, together with a battery of other actin binding proteins, is thought to play a central role in these different processes by modulating the rate of actin depolymerization. A role for ADF in actin filament turnover is well supported by studies on single cell systems, including plant cells (van der Honing et al 2007), however there is little direct evidence linking ADF proteins to complex cellular events during the plant lifecycle. The actin cytoskeleton is the backbone of cytoplasmic organization.…”

Section: Discussionmentioning

confidence: 99%

“…The actin cytoskeleton is the backbone of cytoplasmic organization. Cytoplasmic strands and accumulations cannot exist in the absence of a functional actin cytoskeleton (van der Honing et al 2007). Dynamic reorganization of the actin cytoskeleton is characteristic for cells that are undergoing rapid cytoplasmic reorganization, for example during localized expansion in tip growing pollen tube and root hair cells (Hussey et al 2006).…”

Section: Discussionmentioning

confidence: 99%

BABY BOOM target genes provide diverse entry points into cell proliferation and cell growth pathways

Passarinho¹,

Ketelaar²,

Xing³

et al. 2008

Plant Mol Biol

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104

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Ectopic expression of the Brassica napus BABY BOOM (BBM) AP2/ERF transcription factor is sufficient to induce spontaneous cell proliferation leading primarily to somatic embryogenesis, but also to organogenesis and callus formation. We used DNA microarray analysis in combination with a post-translationally regulated BBM:GR protein and cycloheximide to identify target genes that are directly activated by BBM expression in Arabidopsis seedlings. We show that BBM activated the expression of a largely uncharacterized set of genes encoding proteins with potential roles in transcription, cellular signaling, cell wall biosynthesis and targeted protein turnover. A number of the target genes have been shown to be expressed in meristems or to be involved in cell wall modifications associated with dividing/growing cells. One of the BBM target genes encodes an ADF/cofilin protein, ACTIN DEPOLYMERIZING FACTOR9 (ADF9). The consequences of BBM:GR activation on the actin cytoskeleton were followed using the GFP:FIMBRIN ACTIN BINDING DOMAIN2 (GFP:FABD) actin marker. Dexamethasone-mediated BBM:GR activation induced dramatic changes in actin organization resulting in the formation of dense actin networks with high turnover rates, a phenotype that is consistent with cells that are rapidly undergoing cytoplasmic reorganization. Together the data suggest that the BBM transcription factor activates a complex network of developmental pathways associated with cell proliferation and growth.

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“…However, the latter are very dynamic and their remodeling relies on the extraordinary actin cytoskeleton plasticity. In the near future, it will be of interest to determine whether and how AF bundling contributes, together with AF nucleation and polymerization, to generate the force required to initiate and elongate transcytoplasmic strands [van der Honing et al, 2007].…”

Section: Resultsmentioning

confidence: 99%

Actin bundling in plants

Thomas

Tholl

Moes

et al. 2009

Cell Motil. Cytoskeleton

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Tight regulation of plant actin cytoskeleton organization and dynamics is crucial for numerous cellular processes including cell division, expansion and intracellular trafficking. Among the various actin regulatory proteins, actin-bundling proteins trigger the formation of bundles composed of several parallel actin filaments closely packed together. Actin bundles are present in virtually all plant cells, but their biological roles have rarely been addressed directly. However, decades of research in the plant cytoskeleton field yielded a bulk of data from which an overall picture of the functions supplied by actin bundles in plant cells emerges. Although plants lack several equivalents of animal actin-bundling proteins, they do possess major bundler classes including fimbrins, villins and formins. The existence of additional players is not excluded as exemplified by the recent characterization of plant LIM proteins, which trigger the formation of actin bundles both in vitro and in vivo. This apparent functional redundancy likely reflects the need for plant cells to engineer different types of bundles that act at different sub-cellular locations and exhibit specific function-related properties. By surveying information regarding the properties of plant actin bundles and their associated bundling proteins, the present review aims at clarifying why and how plants make actin bundles. Cell Motil. Cytoskeleton 66: 940-957, 2009. '

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Actin based processes that could determine the cytoplasmic architecture of plant cells

Cited by 23 publications

References 134 publications

Structural changes in the vacuole and cytoskeleton are key to development of the two cytoplasmic domains supporting single-cell C4 photosynthesis in Bienertia sinuspersici

Structural changes in the vacuole and cytoskeleton are key to development of the two cytoplasmic domains supporting single-cell C4 photosynthesis in Bienertia sinuspersici

BABY BOOM target genes provide diverse entry points into cell proliferation and cell growth pathways

Actin bundling in plants

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