The involvement of ethylene and calcium in gray mold of pelargonium,ruscus, and rose plants |
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Authors: | Y Elad Hanne Volpin |
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Abstract: | Leaves ofPelargonium domesticum andRuscus hypoglossum infected byBotrytis cinerea Pers., produced 12 and 1.5 nl ethylene/h/g, respectively, 34 days after inoculation; wounded or healthy leaves and phyloclades
of them produced much lower amounts. When the fungus was grown on dead leaves it produced negligible amounts of the gas even
when supplemented with methionine. Exogenous ethylene enhanced gray mold development in both hosts. Silver thiosulfate, aminooxyacetic
acid (AOA) and aminoethoxyvinylglycine significantly inhibited disease development in pelargonium, and the latter two compounds
inhibited ethylene production. AOA inhibited disease development and ethylene production in cut rose flowers; calcium ions
inhibited disease development whereas the chelator EGTA ethylene glycol bis-(β-aminoethyl ether)N,N,N′,N′-tetraacetic acid]
enhanced it. Disease suppression by an excess of Ca2+ was correlated with repression of ethylene production by the flowers, whereas deficiency in Ca2+ increased disease severity.
Publication of the Agricultural Research Organization. No. 2413-E, 1988 series. |
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Keywords: | Gray mold Botrytis calcium nutrition Ruscus hypoglossum Pelargonium domesticum Rosa hybrida |
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