Abstract
[Methylene-14C]-3-indolylmethylglucosinolate (I4CTMG) was converted in vitro to [methylene-14C]-3 indolylacetonitrile (14C-IAN) by myrosinase over a pH range of 4-0-6-0 and this conversion was enhanced by ferrous ions. Other products of the reaction included 3-indolylmethanol, 3,3 '-diindolyl methane and ascorbigen A. Trace amounts of 14C-IAN were produced non-enzymically from 14C-IMG in the presence of ferrous ion over a similar pH range. Furthermore, swede tissues (Brassica napus cv. Danestone) infected with Plasmodiophora brassicae Woron. could convert l4C-IMG to 14C-IAN. These results were consistent with the hypothesis that the overgrowth symptoms of the clubroot disease are caused by the conversion of IMG to the auxin precursor IAN.
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