Field properties and ion uptake of wheat triticum aestivum cultivar svenno and oat avena sativa cultivar brighton are they expressed in the modulatory influences of ions on membrane atpase?

Wignarajah, K.; Lundborg, T.; Bjorkman, T.; Kylin, A.

Oikos 40(1): 6-13


ISSN/ISBN: 0030-1299
Accession: 005460992

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The CaATPase activities of microsomal fractions (10,000 g .times. 15 min - 30,000 g .times. 60 min) of roots from wheat (T. aestivum L. cv. Svenno) and oat (A. sativa L. cv. Brighton) are inhibited by HCO3- and Cl-; and there is no effect by K+ on the CaATPase. If the ATPase is activated by Mg2+ or by Mn2+ there is little or no effect by HCO3- or Cl-. In wheat preparations, there is again no effect of K+ on the Mg- or MnATPase(s); but in preparations from oat roots both the MgATPase and the MnATPase are strongly stimulated by K+. A relation between MgATPase and K transport is normally accepted, and the difference between wheat and oat could reflect different strength of coupling between energy (ATPase) and carrier for K; with the strong coupling in oat as one of the biochemical adaptations that makes oat functionable as a crop plant on much more acidic soils than wheat. Regulation of anion transport should be a general problem; and alternative hypotheses are presented for how CaATPase may be influenced if a connection with anion transport is assumed. Unity in principles may well be compatible with variation in the specific biochemical solutions of transport problems; and the biochemical solution may, in turn, be one of the factors that determine the ecological possibilities of an organism.