Abstract
Five stages of embryo development were fractionated from a mature culture of Daucus carota (Gelbe Rheinsche), using a series of metal sieves. The composition of the population of embryos in each fraction was determined quantitatively from microscopic investigations. Volatiles from samples of tissue from six stages of development were trapped on activated charcoal cartridges. These volatiles, some of which may play a significant role in the interaction of the plant with the carrot root fly (Psila rosae), were analysed using gas chromatography/mass spectroscopy. The resulting chromatograms are arranged in order of embryo development. The progressive elaboration of the volatile profile reflects the increased biosynthetic capacity of the developing embryo.
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