0.3 nM systemin

Time after wounding (h)

?ig. 1.10.3, Release of fatty acids in tomato leaves after mechanical damage. Only 30 min after a small mechanical damage, the concentrations of free fatty acids rise, compared to an untreated control (time 0). About 85% of the rise is due to the release of linoleic (CI8:2) and linolenic (CI 8:3) acids. Free linolenic acid is the starting point for the synthesis of jasmonate. (After Conconi et al. 1996)

dues are removed by /^-oxidation, leading to the (+)-7-z'so-jasmonate, which can be quickly transformed into the stable (-)-jasmonate. This can be conjugated in many ways, for example, by es-terification, glycosylation and amidation. These conjugates as well as the derivatives of jasmonate, shown in Fig. 1.10.6, exhibit biological activity which is species-specific in some cases.

Jasmonate is ubiquitous in the plant kingdom, prevailing in young, i.e. meristematic, tissues. The methyl ester of jasmonate is volatile and has been identified as the fragrant constituent of the essential oil from jasmin flowers (hence the term). Free jasmonic acid was first isolated in large quantities from the culture filtrate of fungal cultures.

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