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Respiration of the roots of flood tolerant and flood intolerant senecio spp affinity for oxygen and resistance to cyanide



Respiration of the roots of flood tolerant and flood intolerant senecio spp affinity for oxygen and resistance to cyanide



Physiologia Plantarum 42(2): 163-166



The affinity of respiration for O2 in the roots of 6 Senecio spp. [S. aquaticus, S. congestus, S. jacobaea, S. sylvaticus, S. viscosus and S. vulgaris] studied was low compared with the affinity of cytochrome oxidase for O2. Half saturation values of approximately 22 .mu.M O2 were measured. Root respiration was to a large extent insensitive to cyanide in flood-tolerant as well as in flood-sensitive species. The evidence presented suggests that high activity of salicylhydroxamic acid (SHAM)-sensitive oxidase in Senecio roots was the basis for the low O2 affinity and for the high cyanide-insensitivity of root respiration in the Senecio spp. Methods are described to determine the in vivo activity of the SHAM-sensitive oxidase. It was estimated that it contributed 70% to the total root respiration. The presence of SHAM-sensitive oxidase activity could explain a higher efficiency of root growth respiration under a low O2 tension if this alternate oxidase was inhibited at a low O2 concentration in the root medium. However, the SHAM-positive oxidase was not specifically involved in either growth respiration or maintenance respiration. Its significance in regulation of the redox state of the cells is discussed.

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Accession: 006323105

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