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1991 (1)
1980 (1)
1Author    PeterD. Ittrich, Klaus FischerRequires cookie*
 Title    Accum ulation and Conversion o f 3-O -M ethyl-D -G lucose in Guard Cells o f Commelina communis L  
 Abstract    Young plants of Commelina communis L. were allowed to take up [U-14C]-3-0-methyl-D-glucose through the cut stem via the transpiration stream. The distribution of this tracer carbohydrate in the plant was analyzed and its ac­ cumulation investigated in the epidermal tissue by micro­ autoradiography. Over feeding periods from 1 to 24 h 3-O-methyl-D-glucose accumulated predominantly in the guard cells of the stomata, whereas the other epidermal cells contained only minor amounts. Thus, guard cells, despite of the lack of plasmodesmata and the photosynthetic carbon reduction cycle, can easily obtain the carbohydrates from photosynthetic tissues necessary to drive the turgor mechanism of opening and closing. Depending upon the part of the plant, 3-O-methyl-D-glucose was converted during a period of 4 h up to 30% to the corresponding 6-phosphate despite the alledged inert nature in metabo­ lism of this artificial carbohydrate. 
  Reference    Z. Naturforsch. 35c, 832—834 (1980); received July 11 1980 
  Published    1980 
  Keywords    Guard Cells, Stomata, Commelina, Carbohydrate Accu­ mulation 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0832_n.pdf 
 Identifier    ZNC-1980-35c-0832_n 
 Volume    35 
2Author    M. Baier, W. HartungRequires cookie*
 Title    Cytoplasmic pH and Abscisic Acid Transport across Guard Cell Membranes  
 Abstract    The cytoplasmic pH value o f guard cells o f Valerianella locusta was determined from the distribution o f the weak acid [l4C]ABA between the medium and the cell, which was shown to be 8.1 ± 0.1. Treatment o f guard cells in media with low pH (pH 5.0) and different concentra­ tions o f sodium acetate (0 -5 m o lm '3) caused a considerable acidification o f the cytoplasm (6 .6 -7 .7). Using the compartmental analysis we determined also the fluxes o f ABA at the plas­ ma membrane o f guard cells (<I>co) and at the tonoplast o f guard cells (<t>cv) under steady state conditions. The flux o f ABA from the cytoplasm into the vacuoles (tonoplast flux) was de­ pendent upon the cytoplasmic pH. The data give evidence that A B A " is transported across the tonoplast by a saturable transport com ponent. The A BA flux at the plasma membrane seemed to be independent o f the cytoplasmic pH. 
  Reference    Z. Naturforsch. 46c, 106—110 (1991); received September 24 1990 
  Published    1991 
  Keywords    ABA Transport, Cytoplasmic pH, Guard Cells, Plasmamembrane, Tonoplast 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0106.pdf 
 Identifier    ZNC-1991-46c-0106 
 Volume    46