By Felix Bronner (ed.), Arnosl Kleinzeller (ed.)
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Extra resources for Current Topics in Membranes and Transport, Vol. 7
If this is SO, then we are left with no evidence for or against ATP as the energy source 19 ION TRANSPORT IN PLANT CELLS for ion transport in Chara, as we are unable to separate the possible products of the light-driven processes of which the cell is capable. But Smith and Raven (1974) showed that even in Chara the light-dependence of chloride influx differs from that of phosphate influx or glucose uptake; this suggests that its energy source may differ from that of the other solutes. 2. , 1969), although the nature of the linkage is not yet clear.
I n isolated root cortical tissue from maize also M,, was unaffected by content, although the long-term influx (MN, or M,,) was reduced, particularly at high C,, implying a reduction in M,, (Cram, 1973a). The independence of final salt level on C, would then imply that the efflux is in some way regulated by the influx rate, and is not a simple function of the internal content. Pitman (1969), by computer simulation of the behavior of various models of the cell, suggested further that M,, must be an active flux and that it must also be regulated by the vacuolar content.
Pitman (1969), by computer simulation of the behavior of various models of the cell, suggested further that M,, must be an active flux and that it must also be regulated by the vacuolar content. However, in other studies there are effects on M,, as the tissue fills, and the approach to salt saturation does not appear to be reached in these instances solely by rising efflux. Cram and Laties (1971) found that M,, did fall in barley roots as the salt content rose, and it is argued (Cram, 1973b; Pitman and Cram, 1973) that this fall is not to be attributed to the concurrent fall in sugar levels.