Variation on Ethylene Production and Other Host Responses in the Tissues of Sweet Potato Infected by Some Strains of <i>Ceratocystis fimbriata</i>

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  • HYODO Hiroshi
    Institute for Biochemical Regulation, Faculty of Agriculture, Nagoya University
  • URITANI Ikuzo
    Institute for Biochemical Regulation, Faculty of Agriculture, Nagoya University

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Other Title
  • 異なった黒斑病菌のstrainをサツマイモ塊根に接種した際にみられるエチレン生成およびその他宿主の反応の相違について
  • コトナッタ クロ ハン ビョウキン ノ strain オ サツマイモ カイコン ニ セッシュ シタ サイ ニ ミラレル エチレン セイセイ オヨビ ソノタ ヤドヌシ ノ ハンノウ ノ ソウイ ニ ツイテ

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Abstract

Ethylene production in the infected sweet potato root or stem tissue by each strain of Ceratocystis fimbriata differing in pathogenicity (sweet potato strain, coffee strain or prune strain) was examined. Ethylene was remarkably produced in the tissue infected by sweet potato strain, whereas in the tissue infected by coffee strain a small amount of ethylene was produced, and in the tissue infected by prune strain the smallest amount was produced. The result corresponds with the fact which has been reported elsewhere that furano-terpenoids including ipomeamarone were produced most distinctly in infected tissue by sweet potato strain, while in infected tissue by coffee strain the amount produced was very small and in the infected tissue by prune strain the amount was the smallest. This indicated that ethylene as well as furano-terpenoids was produced in a larger amount in the infected tissue by the pathogenic strain. Since the production of ethylene corresponded well with fungus invasion and growth in the host tissue, it was regarded that the amount of ethylene produced in infected tissue might be an indicator to the degree of fungus multiplication.<br>It was shown that when sweet potato root tissue (Norin 1, a moderate resistant variety, was used as a host) was inoculated with coffee or prune strain before infection by sweet potato strain, development of sweet potato strain in the host tissue was markedly suppressed The inhibitory effect was prominently observed in the tissue which had been previously infected by coffee strain. In fact, 50% inhibition (evaluated by ethylene production) was found by an hour prior inoculation with coffee strain to that with sweet potato strain. The mechanism of the inhibitory action caused by the pre-inoculation with a non-pathogenic strain upon multiplication of a pathogenic strain was discussed In connection with the above problem, it was also considered why a non-pathogenic strain ceased to penetrate the surface cells of the host tissue and could not develop further.

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