Abstract
Summary Senescence-promoting substances which corresponded to the vernal abscission of Ficus superba Miquel var. japonica Miquel were investigated. Bioassay systems consisting of chlorophyll loss in oat leaf segments and abscission promotion in bean petiole explants were used. Abscisic acid (ABA), jasmonic acid, methyl jasmonate and C18-unsaturated fatty acids (linoleic acid and linolenic acid) were identified as senescence-promoting substances. The level of ABA in leaves was found to be high in summer and early spring, the latter corresponded to leaf abscission the next year. The level of jasmonic acid was low and remained almost constant during growth cycle of plant. However, methyl jasmonate increased gradually as leaves aged to maximum in early spring, again corresponding to leaf abscission. The data suggest that ABA and methyl jasmonate together with C18-unsaturated fatty acids may play a role in vernal abscission of this plant.
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