Induction of indole synthesis in the appendix of Sauromatum guttatum Schott

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Induction of indole synthesis in young appendix sections of Sauromatum guttatum Schott was studied. The inducer, known as calorigen, a compound synthesized in the mature staminate flower buds, is capable of triggering a rapid metabolic spurt in the appendix of the inflorescence. The induced indole-formation lasts for only a short period of time, and is similar to the normal pattern of indole synthesis. Under the experimental conditions, indole was detectable after 7 to 8 hr of calorigen treatment but had disappeared about 35 hr later. The moment when indole is present in maximal amount coincides with that of maximal heat production, i.e., about 27 hr after the application of calorigen. A simple and sensitive bioassay for detection of calorigen, based on the formation of indole, could be devised. Calorigen also causes, to a lesser extent, a temperature-rise of those young floral parts (male, female and sterile tissues) where indole is not detectable at any time. The time sequence of the induced production of heat for the various floral parts mimics that of a natural metabolic flare-up. Extracts prepared from the mature staminate flowers of Arum maculatum L., Arum dioscoridis Sibth and Sm., and Dracunculus vulgaris Schott were all able to Induce the formation of indole in the appendix of Sauromatum in a fashion similar to that caused by the staminate flower extract of this plant.
日本植物生理学会の論文