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Annals of Botany 23: 241-256, 1959
© 1959 Annals of Botany Company

RESEARCH-ARTICLE

Changes in Sensitivity to Inhibitors of Disks of Storage Tissue

I. R. MACDONALD

Macaulay Institute for Soil Research Craigiebuckler, Aberdeen

The respiratory sensitivity to cyanide of disks of sugar-beet, red beet, carrot, swede, and potato maintained at different temperatures over a prolonged period has been determined manometrically, and the effects of sodium azide and carbon monoxide examined on sugar-beet disks. The normally high sensitivity to cyanide of freshly cut disks falls more or less rapidly depending on the temperature of pretreatment until the oxygen uptake is practically unaffected by the inhibitor. Subsequently the sensitivity redevelops but a brief period during which cyanide exercises a stimulatory effect may be interposed. With beet and carrot disks containing cambial cells there is in the early stages of the lifespan a period of increasing sensitivity to cyanide. It is concluded that there is a characteristic difference in cyanide-sensitivity between growing and non-growing tissue. A discussion of underlying theory is added.


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