Abstract
A new gibberellin (GA) was identified from extracts of cotyledons of 7 day-old canola seedlings (Brassica campestris cv. Tobin). This GA is 12α-hydroxy-GA1 and has been assigned the trivial name of GA85. Isolation was monitored by the Tan-ginbozu dwarf rice micro-drop assay after each high-performance liquid chromatography (HPLC) step. Identification was based on Kovats retention index (KRI) and the mass spectrum of the methyl ester, trimethylsilyl ether (MeTMSi) derivative after analysis by gas chromatography-mass spectrometry (GC-MS) in comparison with an authentic sample of 12α-hydroxy-GA1. Based on quantitation by the dwarf rice micro-drop assay, GA85 is one of the major biologically active GAs in cotyledons of young canola seedlings.
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