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The physiology of sugar-cane IV. Effects of inhibitors on sugar accumulation in storage tissue slices



The physiology of sugar-cane IV. Effects of inhibitors on sugar accumulation in storage tissue slices



Australian Jour Biol Sci 13(3): 221-231



Various metabolic inhibitors, at pH 5.5, affected sugar accumulation in immature sugar-cane storage tissues. The rate of accumulation was reduced by 10-5 [image] mercuric ion, 10-4 [image] p-chloromercuribenzoate, cyanide, and cupric ion, and 2 x 10-3 [image] phloridzin. Accumulation was completely inhibited and sugar leakage induced by 10-5 [image] dinitrophenol, 10-4 [image] mercuric ion, and 10-3 [image] p-chloromercuribenzoate, cyanide, cupric ion, azide, arsenate, and iodoacetate. The effects of 10 -5 [image] dinitrophenol and 10-4 [image] cyanide were reversible, but that of 10-3 [image] cyanide was irreversible. Only slight effects were produced by borate, phosphate, and magnesium ion. The behavior of sugar-cane sugar accumulation towards inhibitors was similar to that of other transport mechanisms, being somewhat more sensitive than most plant processes and less so than animal ones. It differed from sugar accumulation in animal tissues in showing no specific sensitivity to phloridzin. The results suggest that sugars are contained within the immature storage cell by the continuous operation of a metabolic storage mechanism rather than by an impenetrable barrier to sugar diffusion.

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