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  • Lotus (aquaporin)   (1)
  • Pressure probe  (1)
  • water-channels  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Diurnal variations in hydraulic conductivity and root pressure can be correlated with the expression of putative aquaporins in the roots of Lotus japonicus (1999)
    Springer
    Planta 210 (1999), S. 50-60 
    Details
    ISSN: 1432-2048
    Keywords: Key words: Aquaporin ; Diurnal cycle ; Hydraulic conductivity ; Lotus (aquaporin)  ;  Plasma membrane ; Pressure probe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The hydraulic conductivity of excised roots (Lpr) of the legume Lotus japonicus (Regel) K. Larsen grown in mist (aeroponic) and sand cultures, was found to vary over a 5-fold range during a day/night cycle. This behaviour was seen when Lpr was measured in roots exuding, either under root pressure (osmotic driving force), or under an applied hydrostatic pressure of 0.4 MPa which produced a rate of water flow similar to that in a transpiring plant. A similar daily pattern of variation was seen in plants grown in natural daylight or in controlled-environment rooms, in plants transpiring at ambient rates or at greatly reduced rates, and in plants grown in either aeroponic or sand culture. When detached root systems were connected to a root pressure probe, a marked diurnal variation was seen in the root pressure generated. After excision, this circadian rhythm continued for some days. The hydraulic conductivity of the plasma membrane of individual root cells was measured during the diurnal cycle using a cell pressure probe. Measurements were made on the first four cell layers of the cortex, but no evidence of any diurnal fluctuation could be found. It was concluded that the conductance of membranes of endodermal and stelar cells may be responsible for the observed diurnal rhythm in root Lpr. When mRNAs from roots were probed with cDNA from the Arabidopsis aquaporin AthPIP1a gene, an abundant transcript was found to vary in abundance diurnally under high-stringency conditions. The pattern of fluctuations resembled closely the diurnal pattern of variation in root Lpr. The plasma membranes of root cells were found to contain an abundant hydrophobic protein with a molecular weight of about 31 kDa which cross-reacted strongly to an antibody raised against the evolutionarily conserved N-terminal amino acid sequence of AthPIP1a.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250050653
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  • 2
    Electronic Resource
    Electronic Resource
    The lipid bilayer and aquaporins: parallel pathways for water movement into plant cells (1998)
    Springer
    Plant growth regulation 25 (1998), S. 89-95 
    Details
    ISSN: 1573-5087
    Keywords: aquaporins ; plant-stress ; plasma membrane ; water-channels
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The plant plasma membrane is the the major barrier to water flow between cells and their surroundings. Water movement across roots involves pathways comprising many cells and their walls. There are three possible pathways which water can follow, (i) a trans-cellular pathway, which involves serial movement into and out from radial files of cells, (ii) a symplasmic pathway through the plasmodesmata, which creates a cytoplasmic continuum and (iii) a tortuous, extracellular pathway through the cell walls, the apoplasmic pathway. In each of these pathways water movement across cell membranes occurs at some stage. The possible role of water-channels in membranes is discussed in relation to this movement. The molecular identity of water-channel proteins in plasma membranes of plants has been confirmed but there remain a number of unresolved questions about their role in cell and tissue water relations, their interaction with the lipid components of membranes and the relationship between water movement through membranes by diffusion in the bilayer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005918305552
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    Paper (German National Licenses)
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