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  • 1
    Electronic Resource
    Electronic Resource
    Alteration in carbon partitioning induced by the movement protein of tobacco mosaic virus originates in the mesophyll and is independent of change in the plasmodesmal size exclusion limit (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 18 (1995), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The influence of the 30 kDa movement protein of tobacco mosaic virus (TMV-MP) on carbon partitioning in trans-genie tobacco plants (Nicotiana tabacum cv. Xanthi) expressing the TMV-MP was investigated. Using reciprocal grafting of transgenic tobacco plants expressing this movement protein and vector control plants, as well as transgenic tobacco plants expressing the TMV-MP in phloem cells only, we showed that the interactive site involved in carbon allocation to roots is localized to the mesophyll tissue. Biomass partitioning experiments conducted on transgenic plants, in which various deletion mutant forms of the TMV-MP (two of which included deletions in the domain responsible for increasing the size exclusion limit) were expressed, revealed that the TMV-MP exerts its influence on carbon allocation via a mechanism that is completely independent of the TMV-MP-induced increase in the plasmodesmal size exclusion limit. Furthermore, small N- and C-terminal deletions in the MP revealed the complexity of the interactions likely to be involved between the MP and an endogenous regulatory mechanism. We propose that the TMV-MP interferes with an endogenous signal transduction pathway that involves macromolecular trafficking through plasmodesmata to regulate biomass partitioning between the source and various sink tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1995.tb00189.x
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  • 2
    Electronic Resource
    Electronic Resource
    Spatial organization of transport domains and subdomain formation in the plasma membrane of Chara corallina (1995)
    Springer
    The journal of membrane biology 147 (1995), S. 275-281 
    Details
    ISSN: 1432-1424
    Keywords: Chara ; H+ ATPase ; Spatial organization ; Transport domain
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Pattern formation mechanisms in developing organisms determine cellular differentiation and function. However, the components that interact during the manifestation of a spatial pattern are in general unknown. Characean algae represent a model system to study pattern formation. These algae develop alternating acid and alkaline transport domains that influence the pattern of growth. In the present study, it will be demonstrated that a diffusion mechanism is implicated in acid and alkaline domain formation and this growth pattern. Experiments on the characean growth pattern were performed that resulted in pronounced, however, unpredictable modifications in the original pattern. A major component involved in this pattern-forming mechanism emerged from the nonlinear kinetics of the H+-ATPase that is located in the plasma membrane of these algae. Based on these kinetics, a mathematical model was developed and numerically analyzed. As a result, the contribution of a diffusional component to the characean acid/alkaline pattern appeared most likely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234525
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Directional cell-to-cell communication in theArabidopsis root apical meristem II. Dynamics of plasmodesmatal formation (1998)
    Springer
    Protoplasma 204 (1998), S. 84-93 
    Details
    ISSN: 1615-6102
    Keywords: Apical meristem ; Arabidopsis thaliana ; Plasmodesmatal formation ; Position-dependent control ; Root development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Cell development in the root apical meristem is thought to be regulated by position-dependent information, but as yet, the underlying mechanism for this remains unknown. In order to examine the potential involvement of the symplasmic transmission of positional signals, plasmodesmatal frequency and distribution was quantitatively analyzed in root apical meristem cell walls ofArabidopsis thaliana during root development. A consistent distribution pattern of plasmodesmata was observed in the root apex over four weeks. While cells within initial tiers were uniformly interconnected, more symplasmic connections between the initial tiers and their immature-cell (primary-meristem) derivatives were observed than within the initial tiers. Immature cells were connected across transverse walls by primary plasmodesmata according to a tissue-specific pattern. Cells of the immature vascular tissue and cortex had the highest plasmodesmatal frequencies, followed by the immature epidermis and root cap. Although the numbers of plasmodesmata in transverse walls (primary plasmodesmata) was reduced in all tissues as the root aged, the tissue-specific distribution remained constant. The extent of symplasmic coupling across the boundaries of each tissue appeared to be limited by fewer secondary plasmodesmata in longitudinal walls. The frequency of all plasmodesmata decreased as the root aged. The primary plasmodesmata within each tissue increased at one week and then dramatically decreased with root age; the frequency of secondary plasmodesmata in longitudinal walls also decreased, but more gradually. These findings are discussed with respect to the roles likely played by plasmodesmata in facilitating transport of position-dependent information during root development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01282296
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  • 4
    Electronic Resource
    Electronic Resource
    Absence of plasma membrane H+-ATPase in plasmodesmata located in pit-fields of the young reactive pulvinus ofMimosa pudica L. (1995)
    Springer
    Protoplasma 188 (1995), S. 180-185 
    Details
    ISSN: 1615-6102
    Keywords: H+-ATPase ; Plasma membrane ; Plasmodesmata ; Pit-fields ; Pulvinus ; Mimosa pudica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Immunocytochemical techniques were employed to study the spatial distribution of the plasma membrane H+-ATPase within various cell types of the young reactive primary pulvinus ofMimosa pudica L. These cells were interconnected by large numbers of plasmodesmata, being concentrated within pit-fields. Although we could routinely detect evidence of the H+-ATPase along the plasma membrane, immunolabelling was rarely, if ever, observed along the plasma membranes of the plasmodesmata. This finding is discussed with respect to the likely specialized supramolecular structure of the plasmodesma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01280369
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  • 5
    Electronic Resource
    Electronic Resource
    Directional cell-to-cell communication in theArabidopsis root apical meristem I. An ultrastructural and functional analysis (1998)
    Springer
    Protoplasma 203 (1998), S. 35-47 
    Details
    ISSN: 1615-6102
    Keywords: Apical meristem ; Confocal laser scanning microscopy ; Plasmodesmatal distribution ; Fluorescence imaging ; Root development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary As a foundation for studies on directional intercellular communication and its regulation in apical development, the network of plasmodesmata inArabidopsis root apical meristems was characterized by quantitative electron microscopy and dye-coupling analysis, using symplasmic probes, and real-time imaging in confocal laser scanning microscopy. A tissue-specific plasmodesmatal network, which interconnected the cells in the root apical meristem, was characterized by the following features, (a) Plasmodesmatal distribution and density were found to be tissue-specific, (b) Primary and secondary plasmodesmata were differentially grouped and regulated. Primary plasmodesmata were formed in large numbers in the transverse walls of each tissue, and were subject to deletion during cell differentiation. Secondary plasmodesmata were mostly distributed in longitudinal walls between cell files and common walls between neighboring tissues; they also provided a symplasmic path between different initial tiers in the meristem. Small fluorescent tracers moved through the plasmodesmatal network of the root apical meristem in two distinct phases. At low concentrations molecules trafficked in a non-tissue-specific manner, whereas at higher concentrations, their distribution reflected the presence of tissue-specific movement consistent with plasmodesmatal distribution. These findings are discussed in terms of the role of tissue-specific plasmodesmatal domains in the control of root development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01280585
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