NITROGEN METABOLISM IN WHITE POTATO TUBER TISSUE INFECTED WITH FUNGI. CHANGES IN THE ALCOHOL-SOLUBLE AND -INSOLUBLE NITROGEN FRACTIONS

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An increase of the ratio insoluble N/soluble N in potato tuber tissue (var. Bintje) infected with Gibberella soubintetii or Ceratocystis fimbriata and incubated at 25°could only be demonstrated in samples cut from the area invaded by the fungi. In the non-infected ,controls some increase was found in tissue close to the cut surface due to wound-reaction. The fungi hardly. penetrated tuber tissue of var. Koopmans Blauwe, while tubers of var. Alpha were rather susceptible. Tissue of var. Bintje turned out to be rather resistant. Incubation at 30°or 33°resulted in a more limited penetration by the fungi. No relation exists between the value of the ratio insoluble N/soluble N or the protein content of the host tissue, and the grade of resistance to the infection. Again, an increase of insoluble N could only be observed in mycelium-containing samples. The mycelia of both fungi had a ratio insoluble N/soluble N which was much higher than the ratio of normal potato tissue. It was possible to explain the increase of the ratio in invaded tissue On the basis of the presence of hyphal substances. No evidence was obtained for a synthesis by the host tissue of insoluble nitrogenous compounds prior to, or concomitant with, the increase of respiration rate after infection. To what extent a wound-reaction played a role in the infected tuber parts is uncertain. The possibility of a simultaneous synthesis and breakdown of proteins after infection without a rise in insoluble nitrogen is discussed.
日本植物生理学会の論文

NITROGEN METABOLISM IN WHITE POTATO TUBER TISSUE INFECTED WITH FUNGI. CHANGES IN THE ALCOHOL-SOLUBLE AND -INSOLUBLE NITROGEN FRACTIONS

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