ナシ黒斑病菌の宿主特異的作用機構(VIII)

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タイトル別名
  • Nature of specific susceptibility to Alternaria kikuchiana in nijisseiki cultivar among Japanese pears. VIII. Effects of other cations on losses of K+ after exposure to AK-toxin.
  • ナシ黒斑病菌の宿主特異的作用機構-8-AK-毒素のK+透過機能障害に対する各種カチオンの効果〔英文〕
  • ナシ コクハンビョウキン ノ シュクシュ トクイテキ サヨウ キコウ 8 AK
  • Effects of Other Cations on Losses of K<sup>+</sup> after Exposure to AK-Toxin

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The host-specific toxin (AK-toxin) of Alternaria kikuchiana caused rapid increases in efflux of K+ from susceptible leaves of Japanese pear (Pyrus serotina). On the contrary, toxin caused a decrease in effluxes of Na+, Mg2+ and Ca2+ from susceptible tissues, as compared to efflux from control tissue. Toxin-induced loss of K+ was much greater in the presence of Na+, Mg2+ or Ca2+ in the ambient solution. Stimulation of toxin-induced leakage was evident immediately after adding these cations to toxin-treated tissues; when these cations were removed, loss of K+ reverted to the lower level. The stimulative effect of Na+ and Mg2+ increased as the concentrations were increased from 0.01 to 10mM; the effects of Ca2+ reached a plateau at 0.1 to 1.0mM and then rapidly decreased. Susceptible tissues, in the presence of Mg2+ at 10mM, lost most of their K+ by 3hr after exposure to toxin. When toxin-induced K+ efflux was stimulated by other cations, the tissues took up such cations. Na+ and Mg2+ uptakes by toxin-treated tissues continued to increase at a constant rate, but Ca2+ uptake leveled off gradually with time. These data show that AK-toxin affects permeability of susceptible plasma membrane to K+; the loss of K+ may be associated with the presence of certain other inorganic cations.

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