Plant formins come of age: something special about cross‐walls

Baluška, Frantǐsek; Hlavacka, Andrej

doi:10.1111/j.1469-8137.2005.01595.x

Cited by 34 publications

(24 citation statements)

References 28 publications

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“…Similar impacts on the cytoarchitecture were reported in maize root cells exposed to vesicular secretion inhibitor refeldin A (Baluška & Hlavacka 2005), as well as to mastoparan which is affecting phosphoinositide signalling (Baluška et al, 2001c), and to auxin transport inhibitors (Schlicht et al, 2006). Unique BOA-induced effect on the actin cytoskeleton of the transition zone cells is the prominent local assembly of F-actin patches at corners of cross-walls (plant synapses) which resemble published data of the brk1 mutant line of Arabidopsis (Fig.…”

Section: Actin Cytoskeleton Cytoarchitecture and Auxin Transportsupporting

confidence: 52%

Benzoxazolinone Detoxification and Degradation – A Molecule ́s Journey

Schulz¹,

Sicker²,

Baluška³

et al. 2012

Herbicides - Properties, Synthesis and Control of Weeds

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Section: Actin Cytoskeleton Cytoarchitecture and Auxin Transportsupporting

confidence: 52%

Benzoxazolinone Detoxification and Degradation – A Molecule ́s Journey

Schulz¹,

Sicker²,

Baluška³

et al. 2012

Herbicides - Properties, Synthesis and Control of Weeds

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“…Importantly, these auxin-enriched endosomes may represent the elusive BFA-sensitive source of auxin from which auxin is secreted out of cells via BFA-sensitive processes. 29 Auxin accumulating endosomes may also act as putative 'auxin vacuum cleaners' 30,54 which would effectively remove all free auxin from orifices of plasmodesmata in order to prevent their 'uncontrolled' diffusion from cell-to-cell. This function of auxin-accumulating endosomes would be particularly important during early embryogenesis, when plasmodesmata are known to allow free passage of signaling molecules, hormones and peptides, demonstrating that all embryonic cells are part of a single syncytium (symplast).…”

Section: Discussionmentioning

confidence: 99%

“…They assemble F-actin enriched plasma membrane domains at the end-poles, which serve as dynamic platforms for rapid endocytosis and high rate of vesicle recycling. Those tissues, which are active in PAT, such as the stelar cells accomplishing acropetal PAT and the cells of the epidermis and outer cortex driving basipetal PAT, are enriched in F-actin 29,30,33,39 (Suppl. Fig.…”

Section: Discussionmentioning

confidence: 99%

“…14,15,28 As a plausible alternative, a neurotransmitter-like secretory model has been proposed in which auxin is sequestered within endosomes via vesicular transporters and then might be secreted via a BFAsensitive process out of the cells. 4,29,30 If PIN proteins had their activities at membranes delimiting vesicles and recycling endosomes, 29,31 they would enrich these vesicular compartments with IAA. Endosomes and recycling vesicles could fuse with the plasma membrane via a stimulus-activated BFA-sensitive process.…”

Section: Introductionmentioning

confidence: 99%

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Auxin Immunolocalization Implicates Vesicular Neurotransmitter-Like Mode of Polar Auxin Transport in Root Apices

Schlicht

Strnad

Scanlon

et al. 2006

Plant Signaling & Behavior

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103

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Immunolocalization of auxin using a new specific antibody revealed, besides the expected diffuse cytoplasmic signal, enrichments of auxin at end-poles (cross-walls), within endosomes and within nuclei of those root apex cells which accumulate abundant F-actin at their end-poles. In Brefeldin A (BFA) treated roots, a strong auxin signal was scored within BFA-induced compartments of cells having abundant actin and auxin at their end-poles, as well as within adjacent endosomes, but not in other root cells. Importantly, several types of polar auxin transport (PAT) inhibitors exert similar inhibitory effects on endocytosis, vesicle recycling, and on the enrichments of F-actin at the end-poles. These findings indicate that auxin is transported across F-actin-enriched end-poles (synapses) via neurotransmitter-like secretion. This new concept finds genetic support from the semaphore1, rum1 and rum1/lrt1 mutants of maize which are impaired in PAT, endocytosis and vesicle recycling, as well as in recruitment of F-actin and auxin to the auxin transporting end-poles. Although PIN1 localizes abundantly to the end-poles, and they also fail to support the formation of in these mutants affected in PAT, auxin and F-actin are depleted from their end-poles which also fail to support formation of the large BFA-induced compartments.

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“…by analyzing the effects of different combinations of plant actinbundling proteins on bundle assembly. Although this remains speculative, (some of the) group II formins may promote the assembly of actin bundles from locations other than the plasma membrane [Baluska and Hlavacka, 2005].…”

Section: Forminsmentioning

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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Plant formins come of age: something special about cross‐walls

Cited by 34 publications

References 28 publications

Benzoxazolinone Detoxification and Degradation – A Molecule ́s Journey

Benzoxazolinone Detoxification and Degradation – A Molecule ́s Journey

Auxin Immunolocalization Implicates Vesicular Neurotransmitter-Like Mode of Polar Auxin Transport in Root Apices

Actin bundling in plants

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