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The effect of CN(-) and N(2) on the electrical membrane potential (E(m)) was compared with that of CN(-) on the ATP levels in cotyledons of Gossypium hirsutum and in Lemna gibba L. In mature cotton tissue, CN(-) depolarized E(m) to the energy-independent diffusion potential (E(D)) in the dark. In the light E(m) recovered transiently. The same was observed in leaves of Nicotiana, Avena, Impatiens, Kalanchoë, and in Lemna. In contrast, in young cotton cotyledons and tobacco leaves and, to a large extent, in +sucrose-grown Lemna, E(m) was depolarized to E(D) also in the light in a similar way as in the dark.In Lemna grown without sucrose, the energy-dependent component of E(m) was only partially depolarized by CN(-) in dark or light. Cyanide plus salicylhydroxamic acid completely reduced E(m) to E(D), abolished respiration and photosynthesis, and severely diminished the ATP level. This suggests the operation of a CN(-)-insensitive respiration in uninjured Lemna. The initial CN(-)-induced decay of the ATP level in cotton and Lemna was more rapid than the decay of E(m). CN(-)-induced oscillations of the ATP level were followed by similar but slower oscillations of E(m). This supports the view of a general dependence of E(m) on ATP. Discrepancies between inhibitor-induced changes of E(m) and ATP levels are suggested to result from additional regulation of E(m) by the cytoplasmatic pH value.A comparison of E(D) in young and mature cotton cotyledons in the dark and in the light suggests that in growing young cotyledons the different effect of CN(-) in the light is due to a less effective photosynthesis together with high mitochondrial respiration. In Lemna and in mature cotton tissue, E(m) in the light is maintained by noncyclic photophosphorylation and photosystem II, which is only partly inhibited by CN(-), thus resulting in an incomplete depolarization and recovery of E(m). Complete inhibition of photosynthetic O(2) evolution and membrane depolarization by CN(-) plus salicylhydroxamic acid are suggested to result from photooxidation.

Effect of Cyanide in Dark and Light on the Membrane Potential and the ATP Level of Young and Mature Green Tissues of Higher Plants