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Gums are induced by Fusarium oxysporum f.sp. In tulip bulbs, in which a relatively high level of ethylene is produced. Exgeneous ethylene or ethylene-releasing compound (ethephon) also niduced gummosi...s in healthy tulip bulbs but not in order organs, sucn as stem and leaves. Methyl jasmonate (JA-Me) applied alone as a lanolin paste induced gum formation in tulip bulbs, stem and basal part of leaves. Ethephon applied simulutaneously with JA-Me greatly enhanced gum formation in tulip bulbs treated on September 20, exceeded 153mg of dry weight with JA-Me 1.0%, 17mg with ethephon 2.0% and 1206 mg with JA-Me 1.0%+ ethephon 2.0%. After about 4 months any gummosis was observed in each treatent. These results suggest that the induction and/or the production of gums are regulated by a signal network of methyl jasmonate and ethylene, especially by their cross talk. Interactions between endogenous jasmonate and ethylene and gene(s) expression responsible for gum biosynthesis are also discussed.続きを見る
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